* [PATCH v2 0/9] Improve hypot()
@ 2021-10-25 11:57 Adhemerval Zanella
2021-10-25 11:57 ` [PATCH v2 1/9] benchtests: Make hypot input random Adhemerval Zanella
` (8 more replies)
0 siblings, 9 replies; 18+ messages in thread
From: Adhemerval Zanella @ 2021-10-25 11:57 UTC (permalink / raw)
To: libc-alpha
This patchset uses a different algorithm for hypot() based on the
'An Improved Algorithm for hypot(a,b)' by Carlos F. Borges [1]. This
method is also used by Julia language. The motivation for this change
are:
1. The new algorithm is more precise without minimum performance
difference.
2. It allows to consolidate the implementations, since it favor
floating-point operations over integer ones (as done for powerpc).
This might be a boost for some architectures as well.
The current hypot() implementation seems already to be bounded to a
maximum of 1 ulp of error, however the new proposed algorithm shows an
slight precision improvement by showing more correctly rounded results.
With a random 1e9 inputs for different float format I see:
- An improvement from 3427362 to 18457 results with 1 ulp of
error for Binary64.
- An improvement from 233442 to 1274 results with 1 ulp of
error for Binary96 (x86_64).
- An improvement from 453045 to 1294 results with 1 ulp of
error for Binary96 (x86_64).
Also for the maximal known error master shows (in ulps, with
corresponding inputs), determined with [3]:
binary32 0.500 0x1.3ac98p+67,-0x1.ba5ec2p+77
binary64 0.987 -0x0.5a934b7eac967p-1022,-0x0.b5265a7e06b82p-1022
binary96 0.981 0x1.73f339f61eda21dp-16384l,0x2.e45f9f9500877e2p-16384l
binary128 0.985 -0x2.d8311789103b76133ea1d5bc38c4p-16384,-0x1.6d85492006d7dcc6cc52938684p-16384
With the new implementation:
binary32 0.500 0x1.3ac98p+67,-0x1.ba5ec2p+77 [same]
binary64 0.792 0x0.603e52daf0bfdp-1022,-0x0.a622d0a9a433bp-1022
binary96 0.584 -0x2.97b86706043d619p+7240l,0x1.8256bdd12d2e163ep+7240l
binary128 0.749 0x2.2d5faf4036d6e68566f01054612p-8192,0x3.5738e8e2505f5d1fc2973716f05p-8192
Along with the newer implementation, the last patch also optimizes the
call with similar work done for other math functions by removing the
POSIX error handling (which is a big performance boost in some cases
and architectures).
I have adapted the dbl-64, ldbl-96, and ldbl-128, the flt-32 is not
required since it calls the dbl-64 one. I have not adapated ldbl-128ibm
since the format has a lot of caveats and IBM aims to move to ldbl-128.
[1] https://arxiv.org/pdf/1904.09481.pdf
[2] https://github.com/JuliaLang/julia/commit/4a046009a3362ab5e17d369641dbbc9657eb680c
[3] https://gitlab.inria.fr/zimmerma/math_accuracy/-/blob/master/binary64/check_sample2.c
---
Changes from v1:
- Improved benchmarks to have the exponents of the two arguments close
together.
- Fixed typos.
- Fixed i386 C implementation.
---
Adhemerval Zanella (9):
benchtests: Make hypot input random
benchtests: Add hypotf
math: Simplify hypotf implementation
math: Use an improved algorithm for hypot (dbl-64)
math: Use an improved algorithm for hypotl (ldbl-96)
math: Use an improved algorithm for hypotl (ldbl-128)
math: Remove powerpc e_hypot
i386: Move hypot implementation to C
math: Remove the error handling wrapper from hypot and hypotf
benchtests/Makefile | 2 +-
benchtests/hypot-inputs | 1015 ++++++++++++++++-
benchtests/hypotf-inputs | 1007 ++++++++++++++++
math/Versions | 2 +
math/w_hypot.c | 8 +
math/w_hypot_compat.c | 13 +-
math/w_hypotf.c | 8 +
math/w_hypotf_compat.c | 6 +-
sysdeps/i386/fpu/e_hypot.S | 75 --
sysdeps/i386/fpu/e_hypot.c | 56 +
sysdeps/i386/fpu/e_hypotf.S | 64 --
sysdeps/ieee754/dbl-64/e_hypot.c | 247 ++--
sysdeps/ieee754/dbl-64/w_hypot.c | 1 +
sysdeps/ieee754/flt-32/e_hypotf.c | 72 +-
sysdeps/ieee754/flt-32/w_hypotf.c | 1 +
sysdeps/ieee754/ldbl-128/e_hypotl.c | 222 ++--
sysdeps/ieee754/ldbl-96/e_hypotl.c | 227 ++--
sysdeps/mach/hurd/i386/libm.abilist | 2 +
sysdeps/powerpc/fpu/e_hypot.c | 87 --
sysdeps/powerpc/fpu/e_hypotf.c | 78 --
.../powerpc32/power4/fpu/multiarch/Makefile | 5 +-
.../power4/fpu/multiarch/e_hypot-power7.c | 23 -
.../power4/fpu/multiarch/e_hypot-ppc32.c | 23 -
.../powerpc32/power4/fpu/multiarch/e_hypot.c | 33 -
.../power4/fpu/multiarch/e_hypotf-power7.c | 23 -
.../power4/fpu/multiarch/e_hypotf-ppc32.c | 23 -
.../powerpc32/power4/fpu/multiarch/e_hypotf.c | 33 -
sysdeps/unix/sysv/linux/aarch64/libm.abilist | 2 +
sysdeps/unix/sysv/linux/alpha/libm.abilist | 2 +
sysdeps/unix/sysv/linux/arm/be/libm.abilist | 2 +
sysdeps/unix/sysv/linux/arm/le/libm.abilist | 2 +
sysdeps/unix/sysv/linux/hppa/libm.abilist | 2 +
sysdeps/unix/sysv/linux/i386/libm.abilist | 2 +
.../sysv/linux/m68k/coldfire/libm.abilist | 2 +
.../unix/sysv/linux/m68k/m680x0/libm.abilist | 2 +
.../sysv/linux/microblaze/be/libm.abilist | 2 +
.../sysv/linux/microblaze/le/libm.abilist | 2 +
.../unix/sysv/linux/mips/mips32/libm.abilist | 2 +
.../unix/sysv/linux/mips/mips64/libm.abilist | 2 +
sysdeps/unix/sysv/linux/nios2/libm.abilist | 2 +
.../linux/powerpc/powerpc32/fpu/libm.abilist | 2 +
.../powerpc/powerpc32/nofpu/libm.abilist | 2 +
.../linux/powerpc/powerpc64/be/libm.abilist | 2 +
.../linux/powerpc/powerpc64/le/libm.abilist | 2 +
.../unix/sysv/linux/s390/s390-32/libm.abilist | 2 +
.../unix/sysv/linux/s390/s390-64/libm.abilist | 2 +
sysdeps/unix/sysv/linux/sh/be/libm.abilist | 2 +
sysdeps/unix/sysv/linux/sh/le/libm.abilist | 2 +
.../sysv/linux/sparc/sparc32/libm.abilist | 2 +
.../sysv/linux/sparc/sparc64/libm.abilist | 2 +
.../unix/sysv/linux/x86_64/64/libm.abilist | 2 +
.../unix/sysv/linux/x86_64/x32/libm.abilist | 2 +
52 files changed, 2487 insertions(+), 919 deletions(-)
create mode 100644 benchtests/hypotf-inputs
create mode 100644 math/w_hypot.c
create mode 100644 math/w_hypotf.c
delete mode 100644 sysdeps/i386/fpu/e_hypot.S
create mode 100644 sysdeps/i386/fpu/e_hypot.c
delete mode 100644 sysdeps/i386/fpu/e_hypotf.S
create mode 100644 sysdeps/ieee754/dbl-64/w_hypot.c
create mode 100644 sysdeps/ieee754/flt-32/w_hypotf.c
delete mode 100644 sysdeps/powerpc/fpu/e_hypot.c
delete mode 100644 sysdeps/powerpc/fpu/e_hypotf.c
delete mode 100644 sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypot-power7.c
delete mode 100644 sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypot-ppc32.c
delete mode 100644 sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypot.c
delete mode 100644 sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypotf-power7.c
delete mode 100644 sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypotf-ppc32.c
delete mode 100644 sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypotf.c
--
2.32.0
^ permalink raw reply [flat|nested] 18+ messages in thread
* [PATCH v2 1/9] benchtests: Make hypot input random
2021-10-25 11:57 [PATCH v2 0/9] Improve hypot() Adhemerval Zanella
@ 2021-10-25 11:57 ` Adhemerval Zanella
2021-11-01 17:42 ` H.J. Lu
2021-10-25 11:57 ` [PATCH v2 2/9] benchtests: Add hypotf Adhemerval Zanella
` (7 subsequent siblings)
8 siblings, 1 reply; 18+ messages in thread
From: Adhemerval Zanella @ 2021-10-25 11:57 UTC (permalink / raw)
To: libc-alpha
Instead of inputs based on the algorithm implementation details.
Abvout 85% tuples have exponents of the two arguments close
together (+-1 range).
---
benchtests/hypot-inputs | 1015 ++++++++++++++++++++++++++++++++++++++-
1 file changed, 1003 insertions(+), 12 deletions(-)
diff --git a/benchtests/hypot-inputs b/benchtests/hypot-inputs
index e987e5dd1b..d81b1074fc 100644
--- a/benchtests/hypot-inputs
+++ b/benchtests/hypot-inputs
@@ -2,15 +2,1006 @@
## args: double:double
## ret: double
-## name: overflow
-0x3.ffffffffffffcp-1024, 0x8p-152
-## name: higher_two500
-0x1.000002027941dp+500, 0x1.0000000000001p+500
-## name: subnormal
-0x0.fffffffffffffp-1022, 0x0.fffffffffffffp-1022
-## name: less_two500
-0x1.fffffffffffffp-501, 0x1.fffffffffffffp-501
-
-## name: default
-3.0 , 4.0
-5.0 , 4.0
+# Random inputs with absolute value in [DBL_MIN, DBL_MAX]:
+# ~85% tuples have exponents of the two arguments close together (+-1).
+## name: workload-random
+0x1.8024bd901cb38p+728, 0x1.8bac8e454d756p+728
+0x1.8bc032ca6bf0cp-216, 0x1.57b49b40dd4e9p-216
+-0x1.1656a91d4b847p-121, -0x1.0d51e5c39b39fp-121
+0x1.79a9f378abecap+399, 0x1.59bacb3d9f56ep+400
+-0x1.49925edb5064ap+843, -0x1.0592668551351p+842
+0x1.d21c9897128a6p-259, -0x1.51bc0a21de1f3p-258
+0x1.84cc5fd7258a1p+1014, -0x1.b58fdaf45caabp+1015
+0x1.1845f813ed3c1p-832, -0x1.d9a5543225b02p+482
+-0x1.3b08c8b06cdb2p+671, -0x1.29a190173f45fp+898
+-0x1.30cd15e304027p-894, -0x1.47cd824035adap-895
+0x1.46ffcb6755169p-246, 0x1.af6583dfdc71cp-246
+0x1.a2bce0621cbf2p-341, -0x1.b198bc9dfcf99p-342
+-0x1.cc993b94e931fp-1003, 0x1.33137c3233bcdp-57
+0x1.00d963a5aa5e5p-678, -0x1.afa61d932704dp-677
+-0x1.e3eb8a41dd9dbp-111, 0x1.24020ee1501a4p-110
+0x1.b9127c183259fp-87, -0x1.389f7aa3fd9dfp-86
+0x1.f8bc32769e759p-395, -0x1.7571a676e4dc2p+558
+-0x1.29a2a5e6f4a9ap+391, -0x1.52df4c9cd59dap+825
+-0x1.9022515eddea6p+15, -0x1.15054bc1613b8p+15
+0x1.191d44da604a5p+571, -0x1.2c476cbaeb92bp+571
+-0x1.4e9ed60b9276dp-542, -0x1.d1e9d01666a2ep+332
+0x1.f9bf6b717a9fcp+414, -0x1.19a08f5c7f872p+413
+0x1.b9dbc74c2e58fp-440, 0x1.e256d7b07c9b1p-441
+-0x1.8343d5c51f3a9p+859, -0x1.8ef0822b27ed1p+858
+-0x1.5e5b1762e5881p-404, 0x1.f5ff3a8167c04p-17
+0x1.1e904c9fc00d1p+959, 0x1.f6c31b0ccd1a9p+959
+-0x1.7fa4a8addb08bp+51, 0x1.90ed72f6b62c7p+52
+-0x1.bebb659c9bf9ap-417, 0x1.f1b77cddf8b2p-418
+-0x1.18ca40cc0d631p-554, 0x1.094d5bdc0d8edp-553
+-0x1.86ef591ab9b4ap+97, -0x1.4fe38e9e8193ap+97
+0x1.497fe0f1adcf3p+539, -0x1.c915e57cb9b95p+539
+-0x1.51def02fadfc1p-353, 0x1.b5c73210ff633p-354
+0x1.76ee4619eea7ap-213, 0x1.19fb248fb716cp-212
+0x1.4f8710825ddfap+843, 0x1.92e59ffe2df8p+843
+0x1.4873d80d03b26p+466, -0x1.85106ab75f90bp+465
+0x1.be319cdcb009ep+375, 0x1.08a6a81ef2d9fp-329
+0x1.06b9d28caa8a5p-124, -0x1.3071acc060651p-123
+-0x1.3d79f01be7dd4p-185, 0x1.9941fd987b53bp-200
+0x1.81348ce04f796p+175, 0x1.9913616b7ac13p+364
+0x1.0400c1053592p-523, -0x1.9f06e5c55c9fdp-524
+-0x1.f385835592bd6p+765, 0x1.2bfe786e01baap+766
+-0x1.4e102576a532ep+127, -0x1.951064c55d753p+126
+0x1.f3b3b96c637bfp+1002, 0x1.acc8fb4ab3c03p+1002
+0x1.de70180439fd8p-305, -0x1.a3f5933bd6ddep-305
+0x1.624127676d658p+1021, 0x1.133532870c5fep+987
+0x1.8247781ae75cfp-800, 0x1.bdddca24918d3p+865
+0x1.df60bbe47f5fep+316, -0x1.af5566e4385cdp+317
+0x1.fdb99289abbefp+446, 0x1.92c0f6be73211p+447
+0x1.bd6d2922353fcp-217, 0x1.4ddb7ae754a0ep-218
+0x1.c93b3f4e2ad8ep-646, -0x1.163f8646522b1p-646
+0x1.eb0b9d891fb22p+869, -0x1.a33509a6b9a85p-1007
+0x1.e849ab3ba76eep+350, 0x1.854c3fa52be96p+349
+-0x1.79f461843cb01p-122, 0x1.cd9b7909e0b2ep-122
+-0x1.576cd94755dfdp-826, -0x1.55d92da71d0d3p+398
+-0x1.9f326bb0da946p-865, -0x1.30231f24c10a2p-866
+0x1.9edf2eb37345dp+649, -0x1.68730a67b8b1bp+894
+0x1.aaa281c695e92p-43, 0x1.552cfc4892308p-44
+-0x1.881523fe06536p-28, 0x1.b21dd9e68977fp-28
+0x1.9b8e04ce1082bp-1013, -0x1.3d88ff952dc8p+187
+0x1.25fcf7fb2042ep-88, 0x1.d891c908b63fdp-88
+-0x1.095f66e821d8ep+160, 0x1.6d167e58d508bp-348
+-0x1.b93e87d5d0732p-518, 0x1.a1b08ae6d6209p-518
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+-0x1.85a25395c0745p+47, -0x1.214356f11d372p+46
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+-0x1.89c143fff6eedp+89, 0x1.442526199c9f1p+548
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+-0x1.6aff320b3a1a7p-108, 0x1.a4428ad4cc771p-108
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+0x1.dc883891640b9p-848, -0x1.799dc68c3f71ep-849
--
2.32.0
^ permalink raw reply [flat|nested] 18+ messages in thread
* [PATCH v2 2/9] benchtests: Add hypotf
2021-10-25 11:57 [PATCH v2 0/9] Improve hypot() Adhemerval Zanella
2021-10-25 11:57 ` [PATCH v2 1/9] benchtests: Make hypot input random Adhemerval Zanella
@ 2021-10-25 11:57 ` Adhemerval Zanella
2021-11-01 17:42 ` H.J. Lu
2021-10-25 11:57 ` [PATCH v2 3/9] math: Simplify hypotf implementation Adhemerval Zanella
` (6 subsequent siblings)
8 siblings, 1 reply; 18+ messages in thread
From: Adhemerval Zanella @ 2021-10-25 11:57 UTC (permalink / raw)
To: libc-alpha
Based on random input arguments. About 85% tuples have exponents
of the two arguments close together (+-1 range).
---
benchtests/Makefile | 2 +-
benchtests/hypotf-inputs | 1007 ++++++++++++++++++++++++++++++++++++++
2 files changed, 1008 insertions(+), 1 deletion(-)
create mode 100644 benchtests/hypotf-inputs
diff --git a/benchtests/Makefile b/benchtests/Makefile
index 4fcd73131a..ad4bbf2912 100644
--- a/benchtests/Makefile
+++ b/benchtests/Makefile
@@ -26,7 +26,7 @@ bench-math := acos acosh asin asinh atan atanh cos cosh exp exp2 log log2 \
fmaxf powf trunc truncf roundeven roundevenf expf exp2f logf \
log2f sincosf sinf cosf isnan isinf isfinite hypot logb logbf \
exp10f ilogb ilogbf cbrt erf erfc exp10 expm1 j0 j1 lgamma \
- log10 log1p tgamma y0 y1 atan2
+ log10 log1p tgamma y0 y1 atan2 hypotf
ifneq (,$(filter yes,$(float96-fcts)))
bench-math += cbrtl
diff --git a/benchtests/hypotf-inputs b/benchtests/hypotf-inputs
new file mode 100644
index 0000000000..7fd309a1df
--- /dev/null
+++ b/benchtests/hypotf-inputs
@@ -0,0 +1,1007 @@
+## includes: math.h
+## args: float:float
+## ret: float
+
+# Random inputs with absolute value in [FLT_MIN, FTL_MAX]:
+# ~85% tuples have exponents of the two arguments close together (+-1).
+## name: workload-random
+0x1.b37faep-59, -0x1.443f1ep-85
+-0x1.b00438p+31, -0x1.3ee7b6p+31
+-0x1.48dfa2p-37, -0x1.7ac1d2p-37
+-0x1.83f736p+107, -0x1.88b26cp+109
+0x1.83ed54p+91, 0x1.55d334p+93
+-0x1.47ebeap-111, -0x1.dc808p-109
+-0x1.1b0d96p-31, -0x1.dfc498p-33
+0x1.e1bbd8p+71, 0x1.16f5aap+69
+-0x1.e384dap+53, -0x1.42407ap+51
+0x1.e94eccp+3, 0x1.ec1a74p+5
+0x1.98b656p-87, 0x1.ff4ebep-87
+0x1.d0bfcap-125, 0x1.758378p-128
+-0x1.47e2d2p+109, -0x1.837feap+109
+-0x1.fe575p-67, -0x1.d41e62p-65
+-0x1.d9f5a8p+53, -0x1.98ef0ap+55
+0x1.254ebp+127, -0x1.dbe9fp-129
+0x1.20d48cp+69, 0x1.e6f02cp+67
+0x1.8ed386p-87, 0x1.7e75cap-89
+0x1.f2692ep+41, 0x1.6cdc8p+41
+0x1.8040e8p+61, 0x1.d20d7ep+63
+-0x1.4a1e16p-111, -0x1.b67c92p-113
+0x1.3c858ap+51, 0x1.097ddap+53
+0x1.5e8616p+49, 0x1.dd3cp+5
+0x1.0204p+41, 0x1.5eed7cp+41
+-0x1.e5b88p-43, -0x1.119f38p-65
+0x1.b77c7ep+81, 0x1.f2c3bep+79
+-0x1.c4f224p-127, -0x1.935828p-127
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+-0x1.a9f91p+49, -0x1.bc7a8p+51
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+-0x1.26c22ep-93, -0x1.7df728p-91
+-0x1.1d37cap+45, -0x1.655034p+47
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+-0x1.07f2fp+23, -0x1.4c2526p+25
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+0x1.685484p+25, 0x1.92976ep+27
+-0x1.33fb5ap+91, -0x1.a80c78p+93
+0x1.750e36p+105, 0x1.ae37a6p+65
+-0x1.29f6d4p+103, -0x1.0cae78p+101
+0x1.37aa9p-33, 0x1.ed4146p-31
+0x1.69cab6p-75, -0x1.7c0708p+63
+0x1.3011f6p+99, 0x1.576df4p+99
+-0x1.8d5fcep+97, -0x1.0bde36p+97
+-0x1.9fe7c2p-15, -0x1.f953f4p-15
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+-0x1.7fce3ap-31, -0x1.cc3362p-29
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+-0x1.625c56p+55, -0x1.f270fcp+53
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+0x1.db2792p-9, 0x1.6f8a84p-9
+0x1.de4236p+11, 0x1.30a826p+9
+0x1.8175dap+41, 0x1.7ce866p+39
+-0x1.904ac2p+15, -0x1.d8b98ep+15
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+-0x1.28083p-13, -0x1.2f259cp-13
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+-0x1.5c413p+55, -0x1.7d729ap+57
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+0x1.d96fc6p+75, 0x1.1cb39cp+73
+0x1.0667d8p-39, 0x1.513d66p-37
+0x1.fa00d8p-41, 0x1.c5def8p-127
+0x1.9df44ep+89, 0x1.de418ep+87
+-0x1.4906e8p+37, -0x1.0411a2p+35
+0x1.130814p+75, 0x1.6e415ep+73
+-0x1.13f524p+19, -0x1.a448b4p+21
+-0x1.22aef6p-37, -0x1.e70806p-39
+-0x1.496ae6p+89, -0x1.6ecd24p+91
+0x1.c092a4p-27, 0x1.e7d0d8p-29
+0x1.0b83fp-95, 0x1.488ab6p-95
+-0x1.1fc906p-121, -0x1.3a29dp-1
+0x1.27a47cp-45, 0x1.aec276p-45
+0x1.2fb352p+97, 0x1.7095f2p+97
+0x1.e6fd2ap+121, 0x1.0e6b1cp+123
+-0x1.f5f54ep+83, 0x1.0e43fp+123
+-0x1.0895e6p+89, -0x1.3891fp+87
+-0x1.c02328p-31, -0x1.10c3d2p-31
--
2.32.0
^ permalink raw reply [flat|nested] 18+ messages in thread
* [PATCH v2 3/9] math: Simplify hypotf implementation
2021-10-25 11:57 [PATCH v2 0/9] Improve hypot() Adhemerval Zanella
2021-10-25 11:57 ` [PATCH v2 1/9] benchtests: Make hypot input random Adhemerval Zanella
2021-10-25 11:57 ` [PATCH v2 2/9] benchtests: Add hypotf Adhemerval Zanella
@ 2021-10-25 11:57 ` Adhemerval Zanella
2021-10-25 11:57 ` [PATCH v2 4/9] math: Use an improved algorithm for hypot (dbl-64) Adhemerval Zanella
` (5 subsequent siblings)
8 siblings, 0 replies; 18+ messages in thread
From: Adhemerval Zanella @ 2021-10-25 11:57 UTC (permalink / raw)
To: libc-alpha
Use isnan()/isinf() instead of GET_FLOAT_WORD and integer operations.
There is also no need to check for 0.0.
The file Copyright is also changed to use GPL, the implementation was
completely changed by 7c10fd3515f to use double precision instead of
scaling and this change removes all the GET_FLOAT_WORD usage.
Checked on x86_64-linux-gnu.
---
sysdeps/ieee754/flt-32/e_hypotf.c | 57 +++++++++++++------------------
1 file changed, 23 insertions(+), 34 deletions(-)
diff --git a/sysdeps/ieee754/flt-32/e_hypotf.c b/sysdeps/ieee754/flt-32/e_hypotf.c
index e770947dc1..6495a91cd4 100644
--- a/sysdeps/ieee754/flt-32/e_hypotf.c
+++ b/sysdeps/ieee754/flt-32/e_hypotf.c
@@ -1,46 +1,35 @@
-/* e_hypotf.c -- float version of e_hypot.c.
- */
+/* Euclidean distance function. Float/Binary32 version.
+ Copyright (C) 2012-2021 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
-/*
- * ====================================================
- * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
- *
- * Developed at SunPro, a Sun Microsystems, Inc. business.
- * Permission to use, copy, modify, and distribute this
- * software is freely granted, provided that this notice
- * is preserved.
- * ====================================================
- */
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
#include <math.h>
#include <math_private.h>
#include <libm-alias-finite.h>
float
-__ieee754_hypotf(float x, float y)
+__ieee754_hypotf (float x, float y)
{
- double d_x, d_y;
- int32_t ha, hb;
-
- GET_FLOAT_WORD(ha,x);
- ha &= 0x7fffffff;
- GET_FLOAT_WORD(hb,y);
- hb &= 0x7fffffff;
- if (ha == 0x7f800000 && !issignaling (y))
- return fabsf(x);
- else if (hb == 0x7f800000 && !issignaling (x))
- return fabsf(y);
- else if (ha > 0x7f800000 || hb > 0x7f800000)
- return fabsf(x) * fabsf(y);
- else if (ha == 0)
- return fabsf(y);
- else if (hb == 0)
- return fabsf(x);
-
- d_x = (double) x;
- d_y = (double) y;
+ if ((isinf (x) || isinf (y))
+ && !issignaling (x) && !issignaling (y))
+ return INFINITY;
+ if (isnan (x) || isnan (y))
+ return x + y;
- return (float) sqrt(d_x * d_x + d_y * d_y);
+ return sqrt ((double) x * (double) x + (double) y * (double) y);
}
#ifndef __ieee754_hypotf
libm_alias_finite (__ieee754_hypotf, __hypotf)
--
2.32.0
^ permalink raw reply [flat|nested] 18+ messages in thread
* [PATCH v2 4/9] math: Use an improved algorithm for hypot (dbl-64)
2021-10-25 11:57 [PATCH v2 0/9] Improve hypot() Adhemerval Zanella
` (2 preceding siblings ...)
2021-10-25 11:57 ` [PATCH v2 3/9] math: Simplify hypotf implementation Adhemerval Zanella
@ 2021-10-25 11:57 ` Adhemerval Zanella
2021-10-25 11:57 ` [PATCH v2 5/9] math: Use an improved algorithm for hypotl (ldbl-96) Adhemerval Zanella
` (4 subsequent siblings)
8 siblings, 0 replies; 18+ messages in thread
From: Adhemerval Zanella @ 2021-10-25 11:57 UTC (permalink / raw)
To: libc-alpha
This implementation is based on the 'An Improved Algorithm for
hypot(a,b)' by Carlos F. Borges [1] using the MyHypot3 with the
following changes:
- Handle qNaN and sNaN.
- Tune the 'widely varying operands' to avoid spurious underflow
due the multiplication and fix the return value for upwards
rounding mode.
- Handle required underflow exception for denormal results.
The main advantage of the new algorithm is its precision: with a
random 1e9 input pairs in the range of [DBL_MIN, DBL_MAX], glibc
current implementation shows around 0.34% results with an error of
1 ulp (3424869 results) while the new implementation only shows
0.002% of total (18851).
The performance result are also only slight worse than current
implementation. On x86_64 (Ryzen 5900X) with gcc 10.3.1:
Before:
"hypot": {
"workload-random": {
"duration": 3.73205e+09,
"iterations": 1.1e+08,
"reciprocal-throughput": 23.3032,
"latency": 44.5523,
"max-throughput": 4.29127e+07,
"min-throughput": 2.24455e+07
}
}
After:
"hypot": {
"workload-random": {
"duration": 3.74903e+09,
"iterations": 1.04e+08,
"reciprocal-throughput": 22.3537,
"latency": 49.743,
"max-throughput": 4.47353e+07,
"min-throughput": 2.01033e+07
}
}
Co-Authored-By: Paul Zimmermann <Paul.Zimmermann@inria.fr>
Checked on x86_64-linux-gnu and aarch64-linux-gnu.
[1] https://arxiv.org/pdf/1904.09481.pdf
---
sysdeps/ieee754/dbl-64/e_hypot.c | 225 ++++++++++++-------------------
1 file changed, 86 insertions(+), 139 deletions(-)
diff --git a/sysdeps/ieee754/dbl-64/e_hypot.c b/sysdeps/ieee754/dbl-64/e_hypot.c
index 9ec4c1ced0..231fb0d70f 100644
--- a/sysdeps/ieee754/dbl-64/e_hypot.c
+++ b/sysdeps/ieee754/dbl-64/e_hypot.c
@@ -1,164 +1,111 @@
-/* @(#)e_hypot.c 5.1 93/09/24 */
-/*
- * ====================================================
- * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
- *
- * Developed at SunPro, a Sun Microsystems, Inc. business.
- * Permission to use, copy, modify, and distribute this
- * software is freely granted, provided that this notice
- * is preserved.
- * ====================================================
- */
+/* Euclidean distance function. Double/Binary64 version.
+ Copyright (C) 2021 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
-/* __ieee754_hypot(x,y)
- *
- * Method :
- * If (assume round-to-nearest) z=x*x+y*y
- * has error less than sqrt(2)/2 ulp, than
- * sqrt(z) has error less than 1 ulp (exercise).
- *
- * So, compute sqrt(x*x+y*y) with some care as
- * follows to get the error below 1 ulp:
- *
- * Assume x>y>0;
- * (if possible, set rounding to round-to-nearest)
- * 1. if x > 2y use
- * x1*x1+(y*y+(x2*(x+x1))) for x*x+y*y
- * where x1 = x with lower 32 bits cleared, x2 = x-x1; else
- * 2. if x <= 2y use
- * t1*y1+((x-y)*(x-y)+(t1*y2+t2*y))
- * where t1 = 2x with lower 32 bits cleared, t2 = 2x-t1,
- * y1= y with lower 32 bits chopped, y2 = y-y1.
- *
- * NOTE: scaling may be necessary if some argument is too
- * large or too tiny
- *
- * Special cases:
- * hypot(x,y) is INF if x or y is +INF or -INF; else
- * hypot(x,y) is NAN if x or y is NAN.
- *
- * Accuracy:
- * hypot(x,y) returns sqrt(x^2+y^2) with error less
- * than 1 ulps (units in the last place)
- */
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+/* This implementation is based on 'An Improved Algorithm for hypot(a,b)' by
+ Carlos F. Borges [1] using the MyHypot3 with the following changes:
+
+ - Handle qNaN and sNaN.
+ - Tune the 'widely varying operands' to avoid spurious underflow
+ due the multiplication and fix the return value for upwards
+ rounding mode.
+ - Handle required underflow exception for subnormal results.
+
+ [1] https://arxiv.org/pdf/1904.09481.pdf */
#include <math.h>
#include <math_private.h>
#include <math-underflow.h>
+#include <math-narrow-eval.h>
#include <libm-alias-finite.h>
+#include <math_config.h>
+
+/* sqrt (DBL_EPSILON / 2.0) */
+#define SQRT_EPS_DIV_2 0x1.6a09e667f3bcdp-27
+/* DBL_MIN / (sqrt (DBL_EPSILON / 2.0)) */
+#define DBL_MIN_THRESHOLD 0x1.6a09e667f3bcdp-996
+/* eps (double) * sqrt (DBL_MIN)) */
+#define SCALE 0x1p-563
+/* 1 / eps (sqrt (DBL_MIN) */
+#define INV_SCALE 0x1p+563
+/* sqrt (DBL_MAX) */
+#define SQRT_DBL_MAX 0x1.6a09e667f3bccp+511
+/* sqrt (DBL_MIN) */
+#define SQRT_DBL_MIN 0x1p-511
double
__ieee754_hypot (double x, double y)
{
- double a, b, t1, t2, y1, y2, w;
- int32_t j, k, ha, hb;
+ if ((isinf (x) || isinf (y))
+ && !issignaling (x) && !issignaling (y))
+ return INFINITY;
+ if (isnan (x) || isnan (y))
+ return x + y;
- GET_HIGH_WORD (ha, x);
- ha &= 0x7fffffff;
- GET_HIGH_WORD (hb, y);
- hb &= 0x7fffffff;
- if (hb > ha)
- {
- a = y; b = x; j = ha; ha = hb; hb = j;
- }
- else
+ double ax = fabs (x);
+ double ay = fabs (y);
+ if (ay > ax)
{
- a = x; b = y;
+ double tmp = ax;
+ ax = ay;
+ ay = tmp;
}
- SET_HIGH_WORD (a, ha); /* a <- |a| */
- SET_HIGH_WORD (b, hb); /* b <- |b| */
- if ((ha - hb) > 0x3c00000)
- {
- return a + b;
- } /* x/y > 2**60 */
- k = 0;
- if (__glibc_unlikely (ha > 0x5f300000)) /* a>2**500 */
- {
- if (ha >= 0x7ff00000) /* Inf or NaN */
- {
- uint32_t low;
- w = a + b; /* for sNaN */
- if (issignaling (a) || issignaling (b))
- return w;
- GET_LOW_WORD (low, a);
- if (((ha & 0xfffff) | low) == 0)
- w = a;
- GET_LOW_WORD (low, b);
- if (((hb ^ 0x7ff00000) | low) == 0)
- w = b;
- return w;
- }
- /* scale a and b by 2**-600 */
- ha -= 0x25800000; hb -= 0x25800000; k += 600;
- SET_HIGH_WORD (a, ha);
- SET_HIGH_WORD (b, hb);
- }
- if (__builtin_expect (hb < 0x23d00000, 0)) /* b < 2**-450 */
+
+ /* Widely varying operands. The DBL_MIN_THRESHOLD check is used to avoid
+ a spurious underflow from the multiplication. */
+ if (ax >= DBL_MIN_THRESHOLD && ay <= ax * SQRT_EPS_DIV_2)
+ return (ay == 0.0) ? ax : math_narrow_eval (ax + DBL_TRUE_MIN);
+
+ double scale = SCALE;
+ if (ax > SQRT_DBL_MAX)
{
- if (hb <= 0x000fffff) /* subnormal b or 0 */
- {
- uint32_t low;
- GET_LOW_WORD (low, b);
- if ((hb | low) == 0)
- return a;
- t1 = 0;
- SET_HIGH_WORD (t1, 0x7fd00000); /* t1=2^1022 */
- b *= t1;
- a *= t1;
- k -= 1022;
- GET_HIGH_WORD (ha, a);
- GET_HIGH_WORD (hb, b);
- if (hb > ha)
- {
- t1 = a;
- a = b;
- b = t1;
- j = ha;
- ha = hb;
- hb = j;
- }
- }
- else /* scale a and b by 2^600 */
- {
- ha += 0x25800000; /* a *= 2^600 */
- hb += 0x25800000; /* b *= 2^600 */
- k -= 600;
- SET_HIGH_WORD (a, ha);
- SET_HIGH_WORD (b, hb);
- }
+ ax *= scale;
+ ay *= scale;
+ scale = INV_SCALE;
}
- /* medium size a and b */
- w = a - b;
- if (w > b)
+ else if (ay < SQRT_DBL_MIN)
{
- t1 = 0;
- SET_HIGH_WORD (t1, ha);
- t2 = a - t1;
- w = sqrt (t1 * t1 - (b * (-b) - t2 * (a + t1)));
+ ax /= scale;
+ ay /= scale;
}
else
+ scale = 1.0;
+
+ double h = sqrt (ax * ax + ay * ay);
+
+ double t1, t2;
+ if (h == 0.0)
+ return h;
+ else if (h <= 2.0 * ay)
{
- a = a + a;
- y1 = 0;
- SET_HIGH_WORD (y1, hb);
- y2 = b - y1;
- t1 = 0;
- SET_HIGH_WORD (t1, ha + 0x00100000);
- t2 = a - t1;
- w = sqrt (t1 * y1 - (w * (-w) - (t1 * y2 + t2 * b)));
+ double delta = h - ay;
+ t1 = ax * (2.0 * delta - ax);
+ t2 = (delta - 2.0 * (ax - ay)) * delta;
}
- if (k != 0)
+ else
{
- uint32_t high;
- t1 = 1.0;
- GET_HIGH_WORD (high, t1);
- SET_HIGH_WORD (t1, high + (k << 20));
- w *= t1;
- math_check_force_underflow_nonneg (w);
- return w;
+ double delta = h - ax;
+ t1 = 2.0 * delta * (ax - 2 * ay);
+ t2 = (4.0 * delta - ay) * ay + delta * delta;
}
- else
- return w;
+ h -= (t1 + t2) / (2.0 * h);
+ h = math_narrow_eval (h * scale);
+ math_check_force_underflow_nonneg (h);
+ return h;
}
#ifndef __ieee754_hypot
libm_alias_finite (__ieee754_hypot, __hypot)
--
2.32.0
^ permalink raw reply [flat|nested] 18+ messages in thread
* [PATCH v2 5/9] math: Use an improved algorithm for hypotl (ldbl-96)
2021-10-25 11:57 [PATCH v2 0/9] Improve hypot() Adhemerval Zanella
` (3 preceding siblings ...)
2021-10-25 11:57 ` [PATCH v2 4/9] math: Use an improved algorithm for hypot (dbl-64) Adhemerval Zanella
@ 2021-10-25 11:57 ` Adhemerval Zanella
2021-10-25 11:57 ` [PATCH v2 6/9] math: Use an improved algorithm for hypotl (ldbl-128) Adhemerval Zanella
` (3 subsequent siblings)
8 siblings, 0 replies; 18+ messages in thread
From: Adhemerval Zanella @ 2021-10-25 11:57 UTC (permalink / raw)
To: libc-alpha
This implementation is based on 'An Improved Algorithm for hypot(a,b)'
by Carlos F. Borges [1] using the MyHypot3 with the following changes:
- Handle qNaN and sNaN.
- Tune the 'widely varying operands' to avoid spurious underflow
due the multiplication and fix the return value for upwards
rounding mode.
- Handle required underflow exception for subnormal results.
The main advantage of the new algorithm is its precision. With a
random 1e8 input pairs in the range of [LDBL_MIN, LDBL_MAX], glibc
current implementation shows around 0.02% results with an error of
1 ulp (23158 results) while the new implementation only shows
0.0001% of total (111).
[1] https://arxiv.org/pdf/1904.09481.pdf
---
sysdeps/ieee754/ldbl-96/e_hypotl.c | 227 ++++++++++++-----------------
1 file changed, 97 insertions(+), 130 deletions(-)
diff --git a/sysdeps/ieee754/ldbl-96/e_hypotl.c b/sysdeps/ieee754/ldbl-96/e_hypotl.c
index 44e72353c0..85dcbc894b 100644
--- a/sysdeps/ieee754/ldbl-96/e_hypotl.c
+++ b/sysdeps/ieee754/ldbl-96/e_hypotl.c
@@ -1,142 +1,109 @@
-/* e_hypotl.c -- long double version of e_hypot.c.
- */
+/* Euclidean distance function. Long Double/Binary96 version.
+ Copyright (C) 2021 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
-/*
- * ====================================================
- * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
- *
- * Developed at SunPro, a Sun Microsystems, Inc. business.
- * Permission to use, copy, modify, and distribute this
- * software is freely granted, provided that this notice
- * is preserved.
- * ====================================================
- */
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
-/* __ieee754_hypotl(x,y)
- *
- * Method :
- * If (assume round-to-nearest) z=x*x+y*y
- * has error less than sqrt(2)/2 ulp, than
- * sqrt(z) has error less than 1 ulp (exercise).
- *
- * So, compute sqrt(x*x+y*y) with some care as
- * follows to get the error below 1 ulp:
- *
- * Assume x>y>0;
- * (if possible, set rounding to round-to-nearest)
- * 1. if x > 2y use
- * x1*x1+(y*y+(x2*(x+x1))) for x*x+y*y
- * where x1 = x with lower 32 bits cleared, x2 = x-x1; else
- * 2. if x <= 2y use
- * t1*y1+((x-y)*(x-y)+(t1*y2+t2*y))
- * where t1 = 2x with lower 32 bits cleared, t2 = 2x-t1,
- * y1= y with lower 32 bits chopped, y2 = y-y1.
- *
- * NOTE: scaling may be necessary if some argument is too
- * large or too tiny
- *
- * Special cases:
- * hypot(x,y) is INF if x or y is +INF or -INF; else
- * hypot(x,y) is NAN if x or y is NAN.
- *
- * Accuracy:
- * hypot(x,y) returns sqrt(x^2+y^2) with error less
- * than 1 ulps (units in the last place)
- */
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+/* This implementation is based on 'An Improved Algorithm for hypot(a,b)' by
+ Carlos F. Borges [1] using the MyHypot3 with the following changes:
+
+ - Handle qNaN and sNaN.
+ - Tune the 'widely varying operands' to avoid spurious underflow
+ due the multiplication and fix the return value for upwards
+ rounding mode.
+ - Handle required underflow exception for subnormal results.
+
+ [1] https://arxiv.org/pdf/1904.09481.pdf */
#include <math.h>
#include <math_private.h>
#include <math-underflow.h>
#include <libm-alias-finite.h>
-long double __ieee754_hypotl(long double x, long double y)
+/* sqrt (LDBL_EPSILON / 2.0) */
+#define SQRT_EPS_DIV_2 0x8p-35L
+/* DBL_MIN / (sqrt (LDBL_EPSILON / 2.0)) */
+#define LDBL_MIN_THRESHOLD 0x8p-16353L
+/* eps (long double) * sqrt (LDBL_MIN) */
+#define SCALE 0x8p-8257L
+/* 1 / eps (sqrt (LDBL_MIN) */
+#define INV_SCALE 0x8p+8251L
+/* sqrt (LDBL_MAX) */
+#define SQRT_LDBL_MAX 0xb.504f333f9de6484p+8188L
+/* sqrt (LDBL_MIN) */
+#define SQRT_LDBL_MIN 0x8p-8194L
+
+long double
+__ieee754_hypotl (long double x, long double y)
{
- long double a,b,t1,t2,y1,y2,w;
- uint32_t j,k,ea,eb;
+ if ((isinf (x) || isinf (y))
+ && !issignaling (x) && !issignaling (y))
+ return INFINITY;
+ if (isnan (x) || isnan (y))
+ return x + y;
+
+ long double ax = fabsl (x);
+ long double ay = fabsl (y);
+ if (ay > ax)
+ {
+ long double tmp = ax;
+ ax = ay;
+ ay = tmp;
+ }
+
+ /* Widely varying operands. The LDBL_MIN_THRESHOLD check is used to avoid
+ a spurious underflow from the multiplication. */
+ if (ax >= LDBL_MIN_THRESHOLD && ay <= ax * SQRT_EPS_DIV_2)
+ return (ay == 0.0) ? ax : ax + LDBL_TRUE_MIN;
+
+ long double scale = SCALE;
+ if (ax > SQRT_LDBL_MAX)
+ {
+ ax *= scale;
+ ay *= scale;
+ scale = INV_SCALE;
+ }
+ else if (ay < SQRT_LDBL_MIN)
+ {
+ ax /= scale;
+ ay /= scale;
+ }
+ else
+ scale = 1.0L;
+
+ long double h = sqrtl (ax * ax + ay * ay);
- GET_LDOUBLE_EXP(ea,x);
- ea &= 0x7fff;
- GET_LDOUBLE_EXP(eb,y);
- eb &= 0x7fff;
- if(eb > ea) {a=y;b=x;j=ea; ea=eb;eb=j;} else {a=x;b=y;}
- SET_LDOUBLE_EXP(a,ea); /* a <- |a| */
- SET_LDOUBLE_EXP(b,eb); /* b <- |b| */
- if((ea-eb)>0x46) {return a+b;} /* x/y > 2**70 */
- k=0;
- if(__builtin_expect(ea > 0x5f3f,0)) { /* a>2**8000 */
- if(ea == 0x7fff) { /* Inf or NaN */
- uint32_t exp __attribute__ ((unused));
- uint32_t high,low;
- w = a+b; /* for sNaN */
- if (issignaling (a) || issignaling (b))
- return w;
- GET_LDOUBLE_WORDS(exp,high,low,a);
- if(((high&0x7fffffff)|low)==0) w = a;
- GET_LDOUBLE_WORDS(exp,high,low,b);
- if(((eb^0x7fff)|(high&0x7fffffff)|low)==0) w = b;
- return w;
- }
- /* scale a and b by 2**-9600 */
- ea -= 0x2580; eb -= 0x2580; k += 9600;
- SET_LDOUBLE_EXP(a,ea);
- SET_LDOUBLE_EXP(b,eb);
- }
- if(__builtin_expect(eb < 0x20bf, 0)) { /* b < 2**-8000 */
- if(eb == 0) { /* subnormal b or 0 */
- uint32_t exp __attribute__ ((unused));
- uint32_t high,low;
- GET_LDOUBLE_WORDS(exp,high,low,b);
- if((high|low)==0) return a;
- SET_LDOUBLE_WORDS(t1, 0x7ffd, 0x80000000, 0); /* t1=2^16382 */
- b *= t1;
- a *= t1;
- k -= 16382;
- GET_LDOUBLE_EXP (ea, a);
- GET_LDOUBLE_EXP (eb, b);
- if (eb > ea)
- {
- t1 = a;
- a = b;
- b = t1;
- j = ea;
- ea = eb;
- eb = j;
- }
- } else { /* scale a and b by 2^9600 */
- ea += 0x2580; /* a *= 2^9600 */
- eb += 0x2580; /* b *= 2^9600 */
- k -= 9600;
- SET_LDOUBLE_EXP(a,ea);
- SET_LDOUBLE_EXP(b,eb);
- }
- }
- /* medium size a and b */
- w = a-b;
- if (w>b) {
- uint32_t high;
- GET_LDOUBLE_MSW(high,a);
- SET_LDOUBLE_WORDS(t1,ea,high,0);
- t2 = a-t1;
- w = sqrtl(t1*t1-(b*(-b)-t2*(a+t1)));
- } else {
- uint32_t high;
- GET_LDOUBLE_MSW(high,b);
- a = a+a;
- SET_LDOUBLE_WORDS(y1,eb,high,0);
- y2 = b - y1;
- GET_LDOUBLE_MSW(high,a);
- SET_LDOUBLE_WORDS(t1,ea+1,high,0);
- t2 = a - t1;
- w = sqrtl(t1*y1-(w*(-w)-(t1*y2+t2*b)));
- }
- if(k!=0) {
- uint32_t exp;
- t1 = 1.0;
- GET_LDOUBLE_EXP(exp,t1);
- SET_LDOUBLE_EXP(t1,exp+k);
- w *= t1;
- math_check_force_underflow_nonneg (w);
- return w;
- } else return w;
+ long double t1;
+ long double t2;
+ if (h == 0.0L)
+ return h;
+ if (h <= 2.0L * ay)
+ {
+ long double delta = h - ay;
+ t1 = ax * (2.0L * delta - ax);
+ t2 = (delta - 2.0L * (ax - ay)) * delta;
+ }
+ else
+ {
+ long double delta = h - ax;
+ t1 = 2.0L * delta * (ax - 2.0L * ay);
+ t2 = (4.0L * delta - ay) * ay + delta * delta;
+ }
+ h -= (t1 + t2) / (2.0L * h);
+ h *= scale;
+ math_check_force_underflow_nonneg (h);
+ return h;
}
libm_alias_finite (__ieee754_hypotl, __hypotl)
--
2.32.0
^ permalink raw reply [flat|nested] 18+ messages in thread
* [PATCH v2 6/9] math: Use an improved algorithm for hypotl (ldbl-128)
2021-10-25 11:57 [PATCH v2 0/9] Improve hypot() Adhemerval Zanella
` (4 preceding siblings ...)
2021-10-25 11:57 ` [PATCH v2 5/9] math: Use an improved algorithm for hypotl (ldbl-96) Adhemerval Zanella
@ 2021-10-25 11:57 ` Adhemerval Zanella
2021-10-25 11:57 ` [PATCH v2 7/9] math: Remove powerpc e_hypot Adhemerval Zanella
` (2 subsequent siblings)
8 siblings, 0 replies; 18+ messages in thread
From: Adhemerval Zanella @ 2021-10-25 11:57 UTC (permalink / raw)
To: libc-alpha
This implementation is based on 'An Improved Algorithm for hypot(a,b)'
by Carlos F. Borges [1] using the MyHypot3 with the following changes:
- Handle qNaN and sNaN.
- Tune the 'widely varying operands' to avoid spurious underflow
due the multiplication and fix the return value for upwards
rounding mode.
- Handle required underflow exception for subnormal results.
The main advantage of the new algorithm is its precision. With a
random 1e9 input pairs in the range of [LDBL_MIN, LDBL_MAX], glibc
current implementation shows around 0.05% results with an error of
1 ulp (453266 results) while the new implementation only shows
0.0001% of total (1280).
Checked on aarch64-linux-gnu and x86_64-linux-gnu.
[1] https://arxiv.org/pdf/1904.09481.pdf
---
sysdeps/ieee754/ldbl-128/e_hypotl.c | 222 ++++++++++++----------------
1 file changed, 95 insertions(+), 127 deletions(-)
diff --git a/sysdeps/ieee754/ldbl-128/e_hypotl.c b/sysdeps/ieee754/ldbl-128/e_hypotl.c
index cd4fdbc4a6..a27eab0470 100644
--- a/sysdeps/ieee754/ldbl-128/e_hypotl.c
+++ b/sysdeps/ieee754/ldbl-128/e_hypotl.c
@@ -1,141 +1,109 @@
-/* e_hypotl.c -- long double version of e_hypot.c.
- */
+/* Euclidean distance function. Long Double/Binary128 version.
+ Copyright (C) 2021 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
-/*
- * ====================================================
- * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
- *
- * Developed at SunPro, a Sun Microsystems, Inc. business.
- * Permission to use, copy, modify, and distribute this
- * software is freely granted, provided that this notice
- * is preserved.
- * ====================================================
- */
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
-/* __ieee754_hypotl(x,y)
- *
- * Method :
- * If (assume round-to-nearest) z=x*x+y*y
- * has error less than sqrtl(2)/2 ulp, than
- * sqrtl(z) has error less than 1 ulp (exercise).
- *
- * So, compute sqrtl(x*x+y*y) with some care as
- * follows to get the error below 1 ulp:
- *
- * Assume x>y>0;
- * (if possible, set rounding to round-to-nearest)
- * 1. if x > 2y use
- * x1*x1+(y*y+(x2*(x+x1))) for x*x+y*y
- * where x1 = x with lower 64 bits cleared, x2 = x-x1; else
- * 2. if x <= 2y use
- * t1*y1+((x-y)*(x-y)+(t1*y2+t2*y))
- * where t1 = 2x with lower 64 bits cleared, t2 = 2x-t1,
- * y1= y with lower 64 bits chopped, y2 = y-y1.
- *
- * NOTE: scaling may be necessary if some argument is too
- * large or too tiny
- *
- * Special cases:
- * hypotl(x,y) is INF if x or y is +INF or -INF; else
- * hypotl(x,y) is NAN if x or y is NAN.
- *
- * Accuracy:
- * hypotl(x,y) returns sqrtl(x^2+y^2) with error less
- * than 1 ulps (units in the last place)
- */
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+/* This implementation is based on 'An Improved Algorithm for hypot(a,b)' by
+ Carlos F. Borges [1] using the MyHypot3 with the following changes:
+
+ - Handle qNaN and sNaN.
+ - Tune the 'widely varying operands' to avoid spurious underflow
+ due the multiplication and fix the return value for upwards
+ rounding mode.
+ - Handle required underflow exception for subnormal results.
+
+ [1] https://arxiv.org/pdf/1904.09481.pdf */
#include <math.h>
#include <math_private.h>
#include <math-underflow.h>
#include <libm-alias-finite.h>
+/* sqrt (LDBL_EPSILON / 2.0) */
+#define SQRT_EPS_DIV_2 L(0x1.6a09e667f3bcc908b2fb1366ea95p-57)
+/* DBL_MIN / (sqrt (LDBL_EPSILON / 2.0)) */
+#define LDBL_MIN_THRESHOLD L(0x1.6a09e667f3bcc908b2fb1366ea96p-16326)
+/* eps (long double) *(sqrt (LDBL_MIN) */
+#define SCALE L(0x1p-8303)
+/* 1 / eps (sqrt (LDBL_MIN) */
+#define INV_SCALE L(0x1p+8303)
+/* sqrt (LDBL_MAX) */
+#define SQRT_LDBL_MAX L(0x1.6a09e667f3bcc908b2fb1366ea95p+8191)
+/* sqrt (LDBL_MIN) */
+#define SQRT_LDBL_MIN L(0x1p-8191)
+
_Float128
__ieee754_hypotl(_Float128 x, _Float128 y)
{
- _Float128 a,b,t1,t2,y1,y2,w;
- int64_t j,k,ha,hb;
+ if ((isinf (x) || isinf (y))
+ && !issignaling (x) && !issignaling (y))
+ return INFINITY;
+ if (isnan (x) || isnan (y))
+ return x + y;
+
+ _Float128 ax = fabsl (x);
+ _Float128 ay = fabsl (y);
+ if (ay > ax)
+ {
+ _Float128 tmp = ax;
+ ax = ay;
+ ay = tmp;
+ }
+
+ /* Widely varying operands. The DBL_MIN_THRESHOLD check is used to avoid
+ an spurious underflow from the multiplication. */
+ if (ax >= LDBL_MIN_THRESHOLD && ay <= ax * SQRT_EPS_DIV_2)
+ return (ay == 0.0) ? ax : ax + LDBL_TRUE_MIN;
+
+ _Float128 scale = SCALE;
+ if (ax > SQRT_LDBL_MAX)
+ {
+ ax *= scale;
+ ay *= scale;
+ scale = INV_SCALE;
+ }
+ else if (ay < SQRT_LDBL_MIN)
+ {
+ ax /= scale;
+ ay /= scale;
+ }
+ else
+ scale = 1.0;
+
+ _Float128 h = sqrtl (ax * ax + ay * ay);
- GET_LDOUBLE_MSW64(ha,x);
- ha &= 0x7fffffffffffffffLL;
- GET_LDOUBLE_MSW64(hb,y);
- hb &= 0x7fffffffffffffffLL;
- if(hb > ha) {a=y;b=x;j=ha; ha=hb;hb=j;} else {a=x;b=y;}
- SET_LDOUBLE_MSW64(a,ha); /* a <- |a| */
- SET_LDOUBLE_MSW64(b,hb); /* b <- |b| */
- if((ha-hb)>0x78000000000000LL) {return a+b;} /* x/y > 2**120 */
- k=0;
- if(ha > 0x5f3f000000000000LL) { /* a>2**8000 */
- if(ha >= 0x7fff000000000000LL) { /* Inf or NaN */
- uint64_t low;
- w = a+b; /* for sNaN */
- if (issignaling (a) || issignaling (b))
- return w;
- GET_LDOUBLE_LSW64(low,a);
- if(((ha&0xffffffffffffLL)|low)==0) w = a;
- GET_LDOUBLE_LSW64(low,b);
- if(((hb^0x7fff000000000000LL)|low)==0) w = b;
- return w;
- }
- /* scale a and b by 2**-9600 */
- ha -= 0x2580000000000000LL;
- hb -= 0x2580000000000000LL; k += 9600;
- SET_LDOUBLE_MSW64(a,ha);
- SET_LDOUBLE_MSW64(b,hb);
- }
- if(hb < 0x20bf000000000000LL) { /* b < 2**-8000 */
- if(hb <= 0x0000ffffffffffffLL) { /* subnormal b or 0 */
- uint64_t low;
- GET_LDOUBLE_LSW64(low,b);
- if((hb|low)==0) return a;
- t1=0;
- SET_LDOUBLE_MSW64(t1,0x7ffd000000000000LL); /* t1=2^16382 */
- b *= t1;
- a *= t1;
- k -= 16382;
- GET_LDOUBLE_MSW64 (ha, a);
- GET_LDOUBLE_MSW64 (hb, b);
- if (hb > ha)
- {
- t1 = a;
- a = b;
- b = t1;
- j = ha;
- ha = hb;
- hb = j;
- }
- } else { /* scale a and b by 2^9600 */
- ha += 0x2580000000000000LL; /* a *= 2^9600 */
- hb += 0x2580000000000000LL; /* b *= 2^9600 */
- k -= 9600;
- SET_LDOUBLE_MSW64(a,ha);
- SET_LDOUBLE_MSW64(b,hb);
- }
- }
- /* medium size a and b */
- w = a-b;
- if (w>b) {
- t1 = 0;
- SET_LDOUBLE_MSW64(t1,ha);
- t2 = a-t1;
- w = sqrtl(t1*t1-(b*(-b)-t2*(a+t1)));
- } else {
- a = a+a;
- y1 = 0;
- SET_LDOUBLE_MSW64(y1,hb);
- y2 = b - y1;
- t1 = 0;
- SET_LDOUBLE_MSW64(t1,ha+0x0001000000000000LL);
- t2 = a - t1;
- w = sqrtl(t1*y1-(w*(-w)-(t1*y2+t2*b)));
- }
- if(k!=0) {
- uint64_t high;
- t1 = 1;
- GET_LDOUBLE_MSW64(high,t1);
- SET_LDOUBLE_MSW64(t1,high+(k<<48));
- w *= t1;
- math_check_force_underflow_nonneg (w);
- return w;
- } else return w;
+ _Float128 t1;
+ _Float128 t2;
+ if (h == 0.0)
+ return h;
+ if (h <= 2.0 * ay)
+ {
+ _Float128 delta = h - ay;
+ t1 = ax * (2.0 * delta - ax);
+ t2 = (delta - 2.0 * (ax - ay)) * delta;
+ }
+ else
+ {
+ _Float128 delta = h - ax;
+ t1 = 2.0 * delta * (ax - 2 * ay);
+ t2 = (4.0 * delta - ay) * ay + delta * delta;
+ }
+ h -= (t1 + t2) / (2.0 * h);
+ h *= scale;
+ math_check_force_underflow_nonneg (h);
+ return h;
}
libm_alias_finite (__ieee754_hypotl, __hypotl)
--
2.32.0
^ permalink raw reply [flat|nested] 18+ messages in thread
* [PATCH v2 7/9] math: Remove powerpc e_hypot
2021-10-25 11:57 [PATCH v2 0/9] Improve hypot() Adhemerval Zanella
` (5 preceding siblings ...)
2021-10-25 11:57 ` [PATCH v2 6/9] math: Use an improved algorithm for hypotl (ldbl-128) Adhemerval Zanella
@ 2021-10-25 11:57 ` Adhemerval Zanella
2021-10-25 11:57 ` [PATCH v2 8/9] i386: Move hypot implementation to C Adhemerval Zanella
2021-10-25 11:57 ` [PATCH v2 9/9] math: Remove the error handling wrapper from hypot and hypotf Adhemerval Zanella
8 siblings, 0 replies; 18+ messages in thread
From: Adhemerval Zanella @ 2021-10-25 11:57 UTC (permalink / raw)
To: libc-alpha
The powerpc64 does show a big difference (which is mitigated slightly
by the last path):
power9 master:
"hypot": {
"workload-random": {
"duration": 5.35798e+08,
"iterations": 4e+07,
"reciprocal-throughput": 13.0581,
"latency": 13.7318,
"max-throughput": 7.6581e+07,
"min-throughput": 7.28235e+07
}
}
power9 patched:
"hypot": {
"workload-random": {
"duration": 5.40787e+08,
"iterations": 2.6e+07,
"reciprocal-throughput": 18.5395,
"latency": 23.0595,
"max-throughput": 5.39388e+07,
"min-throughput": 4.33661e+07
}
}
power8 master:
"hypot": {
"workload-random": {
"duration": 5.27133e+08,
"iterations": 3.2e+07,
"reciprocal-throughput": 15.8765,
"latency": 17.0693,
"max-throughput": 6.29863e+07,
"min-throughput": 5.85846e+07
}
}
power8 patched:
"hypot": {
"workload-random": {
"duration": 5.32203e+08,
"iterations": 2.2e+07,
"reciprocal-throughput": 22.6077,
"latency": 25.7745,
"max-throughput": 4.42328e+07,
"min-throughput": 3.87981e+07
}
}
Checked on powerpc64-linux-gnu (power8) and powerpc64le-linux-gnu
(power9).
---
sysdeps/powerpc/fpu/e_hypot.c | 87 -------------------
sysdeps/powerpc/fpu/e_hypotf.c | 78 -----------------
.../powerpc32/power4/fpu/multiarch/Makefile | 5 +-
.../power4/fpu/multiarch/e_hypot-power7.c | 23 -----
.../power4/fpu/multiarch/e_hypot-ppc32.c | 23 -----
.../powerpc32/power4/fpu/multiarch/e_hypot.c | 33 -------
.../power4/fpu/multiarch/e_hypotf-power7.c | 23 -----
.../power4/fpu/multiarch/e_hypotf-ppc32.c | 23 -----
.../powerpc32/power4/fpu/multiarch/e_hypotf.c | 33 -------
9 files changed, 1 insertion(+), 327 deletions(-)
delete mode 100644 sysdeps/powerpc/fpu/e_hypot.c
delete mode 100644 sysdeps/powerpc/fpu/e_hypotf.c
delete mode 100644 sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypot-power7.c
delete mode 100644 sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypot-ppc32.c
delete mode 100644 sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypot.c
delete mode 100644 sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypotf-power7.c
delete mode 100644 sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypotf-ppc32.c
delete mode 100644 sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypotf.c
diff --git a/sysdeps/powerpc/fpu/e_hypot.c b/sysdeps/powerpc/fpu/e_hypot.c
deleted file mode 100644
index f96c589bbd..0000000000
--- a/sysdeps/powerpc/fpu/e_hypot.c
+++ /dev/null
@@ -1,87 +0,0 @@
-/* Pythagorean addition using doubles
- Copyright (C) 2011-2021 Free Software Foundation, Inc.
- This file is part of the GNU C Library
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If
- not, see <https://www.gnu.org/licenses/>. */
-
-#include <math.h>
-#include <math_private.h>
-#include <math-underflow.h>
-#include <stdint.h>
-#include <libm-alias-finite.h>
-
-/* __ieee754_hypot(x,y)
- *
- * This a FP only version without any FP->INT conversion.
- * It is similar to default C version, making appropriates
- * overflow and underflows checks as well scaling when it
- * is needed.
- */
-
-double
-__ieee754_hypot (double x, double y)
-{
- if ((isinf (x) || isinf (y))
- && !issignaling (x) && !issignaling (y))
- return INFINITY;
- if (isnan (x) || isnan (y))
- return x + y;
-
- x = fabs (x);
- y = fabs (y);
-
- if (y > x)
- {
- double t = x;
- x = y;
- y = t;
- }
- if (y == 0.0)
- return x;
-
- /* if y is higher enough, y * 2^60 might overflow. The tests if
- y >= 1.7976931348623157e+308/2^60 (two60factor) and uses the
- appropriate check to avoid the overflow exception generation. */
- if (y <= 0x1.fffffffffffffp+963 && x > (y * 0x1p+60))
- return x + y;
-
- if (x > 0x1p+500)
- {
- x *= 0x1p-600;
- y *= 0x1p-600;
- return sqrt (x * x + y * y) / 0x1p-600;
- }
- if (y < 0x1p-500)
- {
- if (y <= 0x0.fffffffffffffp-1022)
- {
- x *= 0x1p+1022;
- y *= 0x1p+1022;
- double ret = sqrt (x * x + y * y) / 0x1p+1022;
- math_check_force_underflow_nonneg (ret);
- return ret;
- }
- else
- {
- x *= 0x1p+600;
- y *= 0x1p+600;
- return sqrt (x * x + y * y) / 0x1p+600;
- }
- }
- return sqrt (x * x + y * y);
-}
-#ifndef __ieee754_hypot
-libm_alias_finite (__ieee754_hypot, __hypot)
-#endif
diff --git a/sysdeps/powerpc/fpu/e_hypotf.c b/sysdeps/powerpc/fpu/e_hypotf.c
deleted file mode 100644
index fa201dda51..0000000000
--- a/sysdeps/powerpc/fpu/e_hypotf.c
+++ /dev/null
@@ -1,78 +0,0 @@
-/* Pythagorean addition using floats
- Copyright (C) 2011-2021 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If
- not, see <https://www.gnu.org/licenses/>. */
-
-#include <math.h>
-#include <math_private.h>
-#include <stdint.h>
-#include <libm-alias-finite.h>
-
-/* __ieee754_hypotf(x,y)
-
- This a FP only version without any FP->INT conversion.
- It is similar to default C version, making appropriates
- overflow and underflows checks as using double precision
- instead of scaling. */
-
-#ifdef _ARCH_PWR7
-/* POWER7 isinf and isnan optimizations are fast. */
-# define TEST_INF_NAN(x, y) \
- if ((isinff(x) || isinff(y)) \
- && !issignaling (x) && !issignaling (y)) \
- return INFINITY; \
- if (isnanf(x) || isnanf(y)) \
- return x + y;
-# else
-/* For POWER6 and below isinf/isnan triggers LHS and PLT calls are
- * costly (especially for POWER6). */
-# define GET_TWO_FLOAT_WORD(f1,f2,i1,i2) \
- do { \
- ieee_float_shape_type gf_u1; \
- ieee_float_shape_type gf_u2; \
- gf_u1.value = (f1); \
- gf_u2.value = (f2); \
- (i1) = gf_u1.word & 0x7fffffff; \
- (i2) = gf_u2.word & 0x7fffffff; \
- } while (0)
-
-# define TEST_INF_NAN(x, y) \
- do { \
- uint32_t hx, hy; \
- GET_TWO_FLOAT_WORD(x, y, hx, hy); \
- if (hy > hx) { \
- uint32_t ht = hx; hx = hy; hy = ht; \
- } \
- if (hx >= 0x7f800000) { \
- if ((hx == 0x7f800000 || hy == 0x7f800000) \
- && !issignaling (x) && !issignaling (y)) \
- return INFINITY; \
- return x + y; \
- } \
- } while (0)
-#endif
-
-
-float
-__ieee754_hypotf (float x, float y)
-{
- TEST_INF_NAN (x, y);
-
- return sqrt ((double) x * x + (double) y * y);
-}
-#ifndef __ieee754_hypotf
-libm_alias_finite (__ieee754_hypotf, __hypotf)
-#endif
diff --git a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/Makefile b/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/Makefile
index 60f2c95532..1de0f9b350 100644
--- a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/Makefile
+++ b/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/Makefile
@@ -15,8 +15,7 @@ libm-sysdep_routines += s_llrintf-power6 s_llrintf-ppc32 s_llrint-power6 \
s_lrint-ppc32 s_modf-power5+ s_modf-ppc32 \
s_modff-power5+ s_modff-ppc32 s_logbl-power7 \
s_logbl-ppc32 s_logb-power7 s_logb-ppc32 \
- s_logbf-power7 s_logbf-ppc32 e_hypot-power7 \
- e_hypot-ppc32 e_hypotf-power7 e_hypotf-ppc32
+ s_logbf-power7 s_logbf-ppc32
CFLAGS-s_llrintf-power6.c += -mcpu=power6
CFLAGS-s_llrintf-ppc32.c += -mcpu=power4
@@ -35,8 +34,6 @@ CFLAGS-s_modff-power5+.c = -mcpu=power5+
CFLAGS-s_logbl-power7.c = -mcpu=power7
CFLAGS-s_logb-power7.c = -mcpu=power7
CFLAGS-s_logbf-power7.c = -mcpu=power7
-CFLAGS-e_hypot-power7.c = -mcpu=power7
-CFLAGS-e_hypotf-power7.c = -mcpu=power7
# These files quiet sNaNs in a way that is optimized away without
# -fsignaling-nans.
diff --git a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypot-power7.c b/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypot-power7.c
deleted file mode 100644
index 382b4a0b27..0000000000
--- a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypot-power7.c
+++ /dev/null
@@ -1,23 +0,0 @@
-/* __ieee_hypot() POWER7 version.
- Copyright (C) 2013-2021 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <https://www.gnu.org/licenses/>. */
-
-#include <math.h>
-
-#define __ieee754_hypot __ieee754_hypot_power7
-
-#include <sysdeps/powerpc/fpu/e_hypot.c>
diff --git a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypot-ppc32.c b/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypot-ppc32.c
deleted file mode 100644
index abb14d5469..0000000000
--- a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypot-ppc32.c
+++ /dev/null
@@ -1,23 +0,0 @@
-/* __ieee_hypot() PowerPC32 version.
- Copyright (C) 2013-2021 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <https://www.gnu.org/licenses/>. */
-
-#include <math.h>
-
-#define __ieee754_hypot __ieee754_hypot_ppc32
-
-#include <sysdeps/powerpc/fpu/e_hypot.c>
diff --git a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypot.c b/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypot.c
deleted file mode 100644
index a16efa350c..0000000000
--- a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypot.c
+++ /dev/null
@@ -1,33 +0,0 @@
-/* Multiple versions of ieee754_hypot.
- Copyright (C) 2013-2021 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <https://www.gnu.org/licenses/>. */
-
-#include <math.h>
-#include <math_private.h>
-#include <math_ldbl_opt.h>
-#include <libm-alias-finite.h>
-#include "init-arch.h"
-
-extern __typeof (__ieee754_hypot) __ieee754_hypot_ppc32 attribute_hidden;
-extern __typeof (__ieee754_hypot) __ieee754_hypot_power7 attribute_hidden;
-
-libc_ifunc (__ieee754_hypot,
- (hwcap & PPC_FEATURE_ARCH_2_06)
- ? __ieee754_hypot_power7
- : __ieee754_hypot_ppc32);
-
-libm_alias_finite (__ieee754_hypot, __hypot)
diff --git a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypotf-power7.c b/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypotf-power7.c
deleted file mode 100644
index f8a26ff22f..0000000000
--- a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypotf-power7.c
+++ /dev/null
@@ -1,23 +0,0 @@
-/* __ieee754_hypot POWER7 version.
- Copyright (C) 2013-2021 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <https://www.gnu.org/licenses/>. */
-
-#include <math.h>
-
-#define __ieee754_hypotf __ieee754_hypotf_power7
-
-#include <sysdeps/powerpc/fpu/e_hypotf.c>
diff --git a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypotf-ppc32.c b/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypotf-ppc32.c
deleted file mode 100644
index b13f8c9db2..0000000000
--- a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypotf-ppc32.c
+++ /dev/null
@@ -1,23 +0,0 @@
-/* __ieee_hypot() PowerPC32 version.
- Copyright (C) 2013-2021 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <https://www.gnu.org/licenses/>. */
-
-#include <math.h>
-
-#define __ieee754_hypotf __ieee754_hypotf_ppc32
-
-#include <sysdeps/ieee754/flt-32/e_hypotf.c>
diff --git a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypotf.c b/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypotf.c
deleted file mode 100644
index 1e72605db8..0000000000
--- a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypotf.c
+++ /dev/null
@@ -1,33 +0,0 @@
-/* Multiple versions of ieee754_hypotf.
- Copyright (C) 2013-2021 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <https://www.gnu.org/licenses/>. */
-
-#include <math.h>
-#include <math_private.h>
-#include <math_ldbl_opt.h>
-#include <libm-alias-finite.h>
-#include "init-arch.h"
-
-extern __typeof (__ieee754_hypotf) __ieee754_hypotf_ppc32 attribute_hidden;
-extern __typeof (__ieee754_hypotf) __ieee754_hypotf_power7 attribute_hidden;
-
-libc_ifunc (__ieee754_hypotf,
- (hwcap & PPC_FEATURE_ARCH_2_06)
- ? __ieee754_hypotf_power7
- : __ieee754_hypotf_ppc32);
-
-libm_alias_finite (__ieee754_hypotf, __hypotf)
--
2.32.0
^ permalink raw reply [flat|nested] 18+ messages in thread
* [PATCH v2 8/9] i386: Move hypot implementation to C
2021-10-25 11:57 [PATCH v2 0/9] Improve hypot() Adhemerval Zanella
` (6 preceding siblings ...)
2021-10-25 11:57 ` [PATCH v2 7/9] math: Remove powerpc e_hypot Adhemerval Zanella
@ 2021-10-25 11:57 ` Adhemerval Zanella
2021-10-25 17:10 ` Joseph Myers
2021-10-25 11:57 ` [PATCH v2 9/9] math: Remove the error handling wrapper from hypot and hypotf Adhemerval Zanella
8 siblings, 1 reply; 18+ messages in thread
From: Adhemerval Zanella @ 2021-10-25 11:57 UTC (permalink / raw)
To: libc-alpha
The generic hypotf is slight slower, mostly due the tricks the assembly
does to optimize the isinf/isnan/issignaling. The generic hypot is way
slower, since the optimized implementation uses the i386 default
excessive precision to issue the operation directly. A similar
implementation is provided instead of using the generic implementation:
Checked on i686-linux-gnu.
---
sysdeps/i386/fpu/e_hypot.S | 75 -------------------------------------
sysdeps/i386/fpu/e_hypot.c | 44 ++++++++++++++++++++++
sysdeps/i386/fpu/e_hypotf.S | 64 -------------------------------
3 files changed, 44 insertions(+), 139 deletions(-)
delete mode 100644 sysdeps/i386/fpu/e_hypot.S
create mode 100644 sysdeps/i386/fpu/e_hypot.c
delete mode 100644 sysdeps/i386/fpu/e_hypotf.S
diff --git a/sysdeps/i386/fpu/e_hypot.S b/sysdeps/i386/fpu/e_hypot.S
deleted file mode 100644
index f2c956b77a..0000000000
--- a/sysdeps/i386/fpu/e_hypot.S
+++ /dev/null
@@ -1,75 +0,0 @@
-/* Compute the hypothenuse of X and Y.
- Copyright (C) 1998-2021 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <https://www.gnu.org/licenses/>. */
-
-#include <sysdep.h>
-#include <i386-math-asm.h>
-#include <libm-alias-finite.h>
-
-DEFINE_DBL_MIN
-
-#ifdef PIC
-# define MO(op) op##@GOTOFF(%edx)
-#else
-# define MO(op) op
-#endif
-
- .text
-ENTRY(__ieee754_hypot)
-#ifdef PIC
- LOAD_PIC_REG (dx)
-#endif
- fldl 4(%esp) // x
- fxam
- fnstsw
- fldl 12(%esp) // y : x
- movb %ah, %ch
- fxam
- fnstsw
- movb %ah, %al
- orb %ch, %ah
- sahf
- jc 1f
- fmul %st(0) // y * y : x
- fxch // x : y * y
- fmul %st(0) // x * x : y * y
- faddp // x * x + y * y
- fsqrt
- DBL_NARROW_EVAL_UFLOW_NONNEG
-2: ret
-
- // We have to test whether any of the parameters is Inf.
- // In this case the result is infinity.
-1: andb $0x45, %al
- cmpb $5, %al
- je 3f // jump if y is Inf
- andb $0x45, %ch
- cmpb $5, %ch
- jne 4f // jump if x is not Inf
- fxch
-3: fstp %st(1)
- fabs
- jmp 2b
-
-4: testb $1, %al
- jnz 5f // y is NaN
- fxch
-5: fstp %st(1)
- jmp 2b
-
-END(__ieee754_hypot)
-libm_alias_finite (__ieee754_hypot, __hypot)
diff --git a/sysdeps/i386/fpu/e_hypot.c b/sysdeps/i386/fpu/e_hypot.c
new file mode 100644
index 0000000000..d3473f2a6a
--- /dev/null
+++ b/sysdeps/i386/fpu/e_hypot.c
@@ -0,0 +1,44 @@
+/* Euclidean distance function. Double/Binary64 i386 version.
+ Copyright (C) 2021 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <math.h>
+#include <math_private.h>
+#include <math-underflow.h>
+#include <math-narrow-eval.h>
+#include <libm-alias-finite.h>
+#include <math_config.h>
+
+/* The i386 allows to use the default excess of precision to optimize the
+ hypot implementation, since internal multiplication and sqrt is carried
+ with 80-bit FP type. */
+double
+__ieee754_hypot (double x, double y)
+{
+ if ((isinf (x) || isinf (y))
+ && !issignaling (x) && !issignaling (y))
+ return INFINITY;
+ if (isnan (x) || isnan (y))
+ return x + y;
+
+ long double lx = x;
+ long double ly = y;
+ double r = math_narrow_eval (sqrtl (lx * lx + ly * ly));
+ math_check_force_underflow_nonneg (r);
+ return r;
+}
+libm_alias_finite (__ieee754_hypot, __hypot)
diff --git a/sysdeps/i386/fpu/e_hypotf.S b/sysdeps/i386/fpu/e_hypotf.S
deleted file mode 100644
index cec5d15403..0000000000
--- a/sysdeps/i386/fpu/e_hypotf.S
+++ /dev/null
@@ -1,64 +0,0 @@
-/* Compute the hypothenuse of X and Y.
- Copyright (C) 1998-2021 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <https://www.gnu.org/licenses/>. */
-
-#include <sysdep.h>
-#include <i386-math-asm.h>
-#include <libm-alias-finite.h>
-
- .text
-ENTRY(__ieee754_hypotf)
- flds 4(%esp) // x
- fxam
- fnstsw
- flds 8(%esp) // y : x
- movb %ah, %ch
- fxam
- fnstsw
- movb %ah, %al
- orb %ch, %ah
- sahf
- jc 1f
- fmul %st(0) // y * y : x
- fxch // x : y * y
- fmul %st(0) // x * x : y * y
- faddp // x * x + y * y
- fsqrt
- FLT_NARROW_EVAL
-2: ret
-
- // We have to test whether any of the parameters is Inf.
- // In this case the result is infinity.
-1: andb $0x45, %al
- cmpb $5, %al
- je 3f // jump if y is Inf
- andb $0x45, %ch
- cmpb $5, %ch
- jne 4f // jump if x is not Inf
- fxch
-3: fstp %st(1)
- fabs
- jmp 2b
-
-4: testb $1, %al
- jnz 5f // y is NaN
- fxch
-5: fstp %st(1)
- jmp 2b
-
-END(__ieee754_hypotf)
-libm_alias_finite (__ieee754_hypotf, __hypotf)
--
2.32.0
^ permalink raw reply [flat|nested] 18+ messages in thread
* [PATCH v2 9/9] math: Remove the error handling wrapper from hypot and hypotf
2021-10-25 11:57 [PATCH v2 0/9] Improve hypot() Adhemerval Zanella
` (7 preceding siblings ...)
2021-10-25 11:57 ` [PATCH v2 8/9] i386: Move hypot implementation to C Adhemerval Zanella
@ 2021-10-25 11:57 ` Adhemerval Zanella
8 siblings, 0 replies; 18+ messages in thread
From: Adhemerval Zanella @ 2021-10-25 11:57 UTC (permalink / raw)
To: libc-alpha
The error handling is moved to sysdeps/ieee754 version with no SVID
support. The compatibility symbol versions still use the wrapper with
SVID error handling around the new code. There is no new symbol version
nor compatibility code on !LIBM_SVID_COMPAT targets (e.g. riscv).
Only ia64 is unchanged, since it still uses the arch specific
__libm_error_region on its implementation.
On x86_64 (Ryzen 5900X) with gcc 10.3.1:
* master:
"hypot": {
"workload-random": {
"duration": 3.726e+09,
"iterations": 9.6e+07,
"reciprocal-throughput": 26.6001,
"latency": 51.0249,
"max-throughput": 3.75939e+07,
"min-throughput": 1.95983e+07
}
}
*patched:
"hypot": {
"workload-random": {
"duration": 3.7578e+09,
"iterations": 1.04e+08,
"reciprocal-throughput": 22.3889,
"latency": 49.8766,
"max-throughput": 4.46651e+07,
"min-throughput": 2.00495e+07
}
}
Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu.
---
math/Versions | 2 ++
math/w_hypot.c | 8 ++++++
math/w_hypot_compat.c | 13 +++++++---
math/w_hypotf.c | 8 ++++++
math/w_hypotf_compat.c | 6 ++---
sysdeps/i386/fpu/e_hypot.c | 14 +++++++++-
sysdeps/ieee754/dbl-64/e_hypot.c | 26 ++++++++++++++++---
sysdeps/ieee754/dbl-64/w_hypot.c | 1 +
sysdeps/ieee754/flt-32/e_hypotf.c | 19 +++++++++++---
sysdeps/ieee754/flt-32/w_hypotf.c | 1 +
sysdeps/mach/hurd/i386/libm.abilist | 2 ++
sysdeps/unix/sysv/linux/aarch64/libm.abilist | 2 ++
sysdeps/unix/sysv/linux/alpha/libm.abilist | 2 ++
sysdeps/unix/sysv/linux/arm/be/libm.abilist | 2 ++
sysdeps/unix/sysv/linux/arm/le/libm.abilist | 2 ++
sysdeps/unix/sysv/linux/hppa/libm.abilist | 2 ++
sysdeps/unix/sysv/linux/i386/libm.abilist | 2 ++
.../sysv/linux/m68k/coldfire/libm.abilist | 2 ++
.../unix/sysv/linux/m68k/m680x0/libm.abilist | 2 ++
.../sysv/linux/microblaze/be/libm.abilist | 2 ++
.../sysv/linux/microblaze/le/libm.abilist | 2 ++
.../unix/sysv/linux/mips/mips32/libm.abilist | 2 ++
.../unix/sysv/linux/mips/mips64/libm.abilist | 2 ++
sysdeps/unix/sysv/linux/nios2/libm.abilist | 2 ++
.../linux/powerpc/powerpc32/fpu/libm.abilist | 2 ++
.../powerpc/powerpc32/nofpu/libm.abilist | 2 ++
.../linux/powerpc/powerpc64/be/libm.abilist | 2 ++
.../linux/powerpc/powerpc64/le/libm.abilist | 2 ++
.../unix/sysv/linux/s390/s390-32/libm.abilist | 2 ++
.../unix/sysv/linux/s390/s390-64/libm.abilist | 2 ++
sysdeps/unix/sysv/linux/sh/be/libm.abilist | 2 ++
sysdeps/unix/sysv/linux/sh/le/libm.abilist | 2 ++
.../sysv/linux/sparc/sparc32/libm.abilist | 2 ++
.../sysv/linux/sparc/sparc64/libm.abilist | 2 ++
.../unix/sysv/linux/x86_64/64/libm.abilist | 2 ++
.../unix/sysv/linux/x86_64/x32/libm.abilist | 2 ++
36 files changed, 135 insertions(+), 15 deletions(-)
create mode 100644 math/w_hypot.c
create mode 100644 math/w_hypotf.c
create mode 100644 sysdeps/ieee754/dbl-64/w_hypot.c
create mode 100644 sysdeps/ieee754/flt-32/w_hypotf.c
diff --git a/math/Versions b/math/Versions
index a4b5405ddc..fef7a08c3b 100644
--- a/math/Versions
+++ b/math/Versions
@@ -628,5 +628,7 @@ libm {
fminimum_numf64x; fminimum_numf128;
fminimum_magf64x; fminimum_magf128;
fminimum_mag_numf64x; fminimum_mag_numf128;
+ # No SVID compatible error handling.
+ hypotf; hypot;
}
}
diff --git a/math/w_hypot.c b/math/w_hypot.c
new file mode 100644
index 0000000000..66f723a896
--- /dev/null
+++ b/math/w_hypot.c
@@ -0,0 +1,8 @@
+#include <math-type-macros-float.h>
+#undef __USE_WRAPPER_TEMPLATE
+#define __USE_WRAPPER_TEMPLATE 1
+#undef declare_mgen_alias
+#define declare_mgen_alias(a, b)
+#include <w_hypot_template.c>
+versioned_symbol (libm, __hypot, hypot, GLIBC_2_35);
+libm_alias_float_other (__hypot, hypot)
diff --git a/math/w_hypot_compat.c b/math/w_hypot_compat.c
index f07039cc51..ec983a4ab8 100644
--- a/math/w_hypot_compat.c
+++ b/math/w_hypot_compat.c
@@ -20,9 +20,9 @@
#include <libm-alias-double.h>
-#if LIBM_SVID_COMPAT
+#if LIBM_SVID_COMPAT && SHLIB_COMPAT (libm, GLIBC_2_0, GLIBC_2_35)
double
-__hypot (double x, double y)
+__hypot_compat (double x, double y)
{
double z = __ieee754_hypot(x,y);
if(__builtin_expect(!isfinite(z), 0)
@@ -31,5 +31,12 @@ __hypot (double x, double y)
return z;
}
-libm_alias_double (__hypot, hypot)
+compat_symbol (libm, __hypot_compat, hypot, GLIBC_2_0);
+# ifdef NO_LONG_DOUBLE
+weak_alias (__hypot_compat, hypotl)
+# endif
+# ifdef LONG_DOUBLE_COMPAT
+LONG_DOUBLE_COMPAT_CHOOSE_libm_hypotl (
+ compat_symbol (libm, __hypot_compat, hypotl, FIRST_VERSION_libm_hypotl), );
+# endif
#endif
diff --git a/math/w_hypotf.c b/math/w_hypotf.c
new file mode 100644
index 0000000000..b15a9b06d0
--- /dev/null
+++ b/math/w_hypotf.c
@@ -0,0 +1,8 @@
+#include <math-type-macros-float.h>
+#undef __USE_WRAPPER_TEMPLATE
+#define __USE_WRAPPER_TEMPLATE 1
+#undef declare_mgen_alias
+#define declare_mgen_alias(a, b)
+#include <w_hypot_template.c>
+versioned_symbol (libm, __hypotf, hypotf, GLIBC_2_35);
+libm_alias_float_other (__hypotf, hypotf)
diff --git a/math/w_hypotf_compat.c b/math/w_hypotf_compat.c
index 05898d3420..2bde4553b0 100644
--- a/math/w_hypotf_compat.c
+++ b/math/w_hypotf_compat.c
@@ -22,9 +22,9 @@
#include <libm-alias-float.h>
-#if LIBM_SVID_COMPAT
+#if LIBM_SVID_COMPAT && SHLIB_COMPAT (libm, GLIBC_2_0, GLIBC_2_35)
float
-__hypotf(float x, float y)
+__hypotf_compat (float x, float y)
{
float z = __ieee754_hypotf(x,y);
if(__builtin_expect(!isfinite(z), 0)
@@ -34,5 +34,5 @@ __hypotf(float x, float y)
return z;
}
-libm_alias_float (__hypot, hypot)
+compat_symbol (libm, __hypotf_compat, hypotf, GLIBC_2_0);
#endif
diff --git a/sysdeps/i386/fpu/e_hypot.c b/sysdeps/i386/fpu/e_hypot.c
index d3473f2a6a..c704f325a9 100644
--- a/sysdeps/i386/fpu/e_hypot.c
+++ b/sysdeps/i386/fpu/e_hypot.c
@@ -20,14 +20,17 @@
#include <math_private.h>
#include <math-underflow.h>
#include <math-narrow-eval.h>
+#include <math-svid-compat.h>
#include <libm-alias-finite.h>
+#include <libm-alias-double.h>
#include <math_config.h>
+#include <errno.h>
/* The i386 allows to use the default excess of precision to optimize the
hypot implementation, since internal multiplication and sqrt is carried
with 80-bit FP type. */
double
-__ieee754_hypot (double x, double y)
+__hypot (double x, double y)
{
if ((isinf (x) || isinf (y))
&& !issignaling (x) && !issignaling (y))
@@ -39,6 +42,15 @@ __ieee754_hypot (double x, double y)
long double ly = y;
double r = math_narrow_eval (sqrtl (lx * lx + ly * ly));
math_check_force_underflow_nonneg (r);
+ if (isinf (r))
+ __set_errno (ERANGE);
return r;
}
+strong_alias (__hypot, __ieee754_hypot)
+#if LIBM_SVID_COMPAT
+versioned_symbol (libm, __hypot, hypot, GLIBC_2_35);
libm_alias_finite (__ieee754_hypot, __hypot)
+libm_alias_double_other (__hypot, hypot)
+#else
+libm_alias_double (__hypot, hypot)
+#endif
diff --git a/sysdeps/ieee754/dbl-64/e_hypot.c b/sysdeps/ieee754/dbl-64/e_hypot.c
index 231fb0d70f..d20bc3e365 100644
--- a/sysdeps/ieee754/dbl-64/e_hypot.c
+++ b/sysdeps/ieee754/dbl-64/e_hypot.c
@@ -32,7 +32,18 @@
#include <math-underflow.h>
#include <math-narrow-eval.h>
#include <libm-alias-finite.h>
+#include <libm-alias-double.h>
#include <math_config.h>
+#include <math-svid-compat.h>
+#include <errno.h>
+
+static inline double
+handle_errno (double r)
+{
+ if (isinf (r))
+ __set_errno (ERANGE);
+ return r;
+}
/* sqrt (DBL_EPSILON / 2.0) */
#define SQRT_EPS_DIV_2 0x1.6a09e667f3bcdp-27
@@ -48,7 +59,7 @@
#define SQRT_DBL_MIN 0x1p-511
double
-__ieee754_hypot (double x, double y)
+__hypot (double x, double y)
{
if ((isinf (x) || isinf (y))
&& !issignaling (x) && !issignaling (y))
@@ -68,7 +79,9 @@ __ieee754_hypot (double x, double y)
/* Widely varying operands. The DBL_MIN_THRESHOLD check is used to avoid
a spurious underflow from the multiplication. */
if (ax >= DBL_MIN_THRESHOLD && ay <= ax * SQRT_EPS_DIV_2)
- return (ay == 0.0) ? ax : math_narrow_eval (ax + DBL_TRUE_MIN);
+ return (ay == 0.0)
+ ? ax
+ : handle_errno (math_narrow_eval (ax + DBL_TRUE_MIN));
double scale = SCALE;
if (ax > SQRT_DBL_MAX)
@@ -105,8 +118,13 @@ __ieee754_hypot (double x, double y)
h -= (t1 + t2) / (2.0 * h);
h = math_narrow_eval (h * scale);
math_check_force_underflow_nonneg (h);
- return h;
+ return handle_errno (h);
}
-#ifndef __ieee754_hypot
+strong_alias (__hypot, __ieee754_hypot)
libm_alias_finite (__ieee754_hypot, __hypot)
+#if LIBM_SVID_COMPAT
+versioned_symbol (libm, __hypot, hypot, GLIBC_2_35);
+libm_alias_double_other (__hypot, hypot)
+#else
+libm_alias_double (__hypot, hypot)
#endif
diff --git a/sysdeps/ieee754/dbl-64/w_hypot.c b/sysdeps/ieee754/dbl-64/w_hypot.c
new file mode 100644
index 0000000000..1cc8931700
--- /dev/null
+++ b/sysdeps/ieee754/dbl-64/w_hypot.c
@@ -0,0 +1 @@
+/* Not needed. */
diff --git a/sysdeps/ieee754/flt-32/e_hypotf.c b/sysdeps/ieee754/flt-32/e_hypotf.c
index 6495a91cd4..d73eecca8c 100644
--- a/sysdeps/ieee754/flt-32/e_hypotf.c
+++ b/sysdeps/ieee754/flt-32/e_hypotf.c
@@ -19,9 +19,12 @@
#include <math.h>
#include <math_private.h>
#include <libm-alias-finite.h>
+#include <libm-alias-float.h>
+#include <math-svid-compat.h>
+#include <errno.h>
float
-__ieee754_hypotf (float x, float y)
+__hypotf (float x, float y)
{
if ((isinf (x) || isinf (y))
&& !issignaling (x) && !issignaling (y))
@@ -29,8 +32,16 @@ __ieee754_hypotf (float x, float y)
if (isnan (x) || isnan (y))
return x + y;
- return sqrt ((double) x * (double) x + (double) y * (double) y);
+ float r = sqrt ((double) x * (double) x + (double) y * (double) y);
+ if (!isfinite (r))
+ __set_errno (ERANGE);
+ return r;
}
-#ifndef __ieee754_hypotf
-libm_alias_finite (__ieee754_hypotf, __hypotf)
+strong_alias (__hypotf, __ieee754_hypotf)
+#if LIBM_SVID_COMPAT
+versioned_symbol (libm, __hypotf, hypotf, GLIBC_2_35);
+libm_alias_float_other (__hypot, hypot)
+#else
+libm_alias_float (__hypot, hypot)
#endif
+libm_alias_finite (__ieee754_hypotf, __hypotf)
diff --git a/sysdeps/ieee754/flt-32/w_hypotf.c b/sysdeps/ieee754/flt-32/w_hypotf.c
new file mode 100644
index 0000000000..1cc8931700
--- /dev/null
+++ b/sysdeps/ieee754/flt-32/w_hypotf.c
@@ -0,0 +1 @@
+/* Not needed. */
diff --git a/sysdeps/mach/hurd/i386/libm.abilist b/sysdeps/mach/hurd/i386/libm.abilist
index abf91bd142..8f40ddb150 100644
--- a/sysdeps/mach/hurd/i386/libm.abilist
+++ b/sysdeps/mach/hurd/i386/libm.abilist
@@ -1179,3 +1179,5 @@ GLIBC_2.35 fminimumf64x F
GLIBC_2.35 fminimuml F
GLIBC_2.35 fsqrt F
GLIBC_2.35 fsqrtl F
+GLIBC_2.35 hypot F
+GLIBC_2.35 hypotf F
diff --git a/sysdeps/unix/sysv/linux/aarch64/libm.abilist b/sysdeps/unix/sysv/linux/aarch64/libm.abilist
index 1cef7d3db7..c2e3c6453e 100644
--- a/sysdeps/unix/sysv/linux/aarch64/libm.abilist
+++ b/sysdeps/unix/sysv/linux/aarch64/libm.abilist
@@ -1144,3 +1144,5 @@ GLIBC_2.35 fminimumf64x F
GLIBC_2.35 fminimuml F
GLIBC_2.35 fsqrt F
GLIBC_2.35 fsqrtl F
+GLIBC_2.35 hypot F
+GLIBC_2.35 hypotf F
diff --git a/sysdeps/unix/sysv/linux/alpha/libm.abilist b/sysdeps/unix/sysv/linux/alpha/libm.abilist
index 59d51021fa..4f85b6180f 100644
--- a/sysdeps/unix/sysv/linux/alpha/libm.abilist
+++ b/sysdeps/unix/sysv/linux/alpha/libm.abilist
@@ -1201,6 +1201,8 @@ GLIBC_2.35 fminimumf64x F
GLIBC_2.35 fminimuml F
GLIBC_2.35 fsqrt F
GLIBC_2.35 fsqrtl F
+GLIBC_2.35 hypot F
+GLIBC_2.35 hypotf F
GLIBC_2.4 __clog10l F
GLIBC_2.4 __finitel F
GLIBC_2.4 __fpclassifyl F
diff --git a/sysdeps/unix/sysv/linux/arm/be/libm.abilist b/sysdeps/unix/sysv/linux/arm/be/libm.abilist
index 44666ad7cd..36190add84 100644
--- a/sysdeps/unix/sysv/linux/arm/be/libm.abilist
+++ b/sysdeps/unix/sysv/linux/arm/be/libm.abilist
@@ -531,6 +531,8 @@ GLIBC_2.35 fminimumf64 F
GLIBC_2.35 fminimuml F
GLIBC_2.35 fsqrt F
GLIBC_2.35 fsqrtl F
+GLIBC_2.35 hypot F
+GLIBC_2.35 hypotf F
GLIBC_2.4 _LIB_VERSION D 0x4
GLIBC_2.4 __clog10 F
GLIBC_2.4 __clog10f F
diff --git a/sysdeps/unix/sysv/linux/arm/le/libm.abilist b/sysdeps/unix/sysv/linux/arm/le/libm.abilist
index 44666ad7cd..36190add84 100644
--- a/sysdeps/unix/sysv/linux/arm/le/libm.abilist
+++ b/sysdeps/unix/sysv/linux/arm/le/libm.abilist
@@ -531,6 +531,8 @@ GLIBC_2.35 fminimumf64 F
GLIBC_2.35 fminimuml F
GLIBC_2.35 fsqrt F
GLIBC_2.35 fsqrtl F
+GLIBC_2.35 hypot F
+GLIBC_2.35 hypotf F
GLIBC_2.4 _LIB_VERSION D 0x4
GLIBC_2.4 __clog10 F
GLIBC_2.4 __clog10f F
diff --git a/sysdeps/unix/sysv/linux/hppa/libm.abilist b/sysdeps/unix/sysv/linux/hppa/libm.abilist
index 35d316a720..b5dd4e851f 100644
--- a/sysdeps/unix/sysv/linux/hppa/libm.abilist
+++ b/sysdeps/unix/sysv/linux/hppa/libm.abilist
@@ -842,4 +842,6 @@ GLIBC_2.35 fminimumf64 F
GLIBC_2.35 fminimuml F
GLIBC_2.35 fsqrt F
GLIBC_2.35 fsqrtl F
+GLIBC_2.35 hypot F
+GLIBC_2.35 hypotf F
GLIBC_2.4 exp2l F
diff --git a/sysdeps/unix/sysv/linux/i386/libm.abilist b/sysdeps/unix/sysv/linux/i386/libm.abilist
index ef99b3e104..5d89aaa08e 100644
--- a/sysdeps/unix/sysv/linux/i386/libm.abilist
+++ b/sysdeps/unix/sysv/linux/i386/libm.abilist
@@ -1186,3 +1186,5 @@ GLIBC_2.35 fminimumf64x F
GLIBC_2.35 fminimuml F
GLIBC_2.35 fsqrt F
GLIBC_2.35 fsqrtl F
+GLIBC_2.35 hypot F
+GLIBC_2.35 hypotf F
diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist
index 44666ad7cd..36190add84 100644
--- a/sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist
@@ -531,6 +531,8 @@ GLIBC_2.35 fminimumf64 F
GLIBC_2.35 fminimuml F
GLIBC_2.35 fsqrt F
GLIBC_2.35 fsqrtl F
+GLIBC_2.35 hypot F
+GLIBC_2.35 hypotf F
GLIBC_2.4 _LIB_VERSION D 0x4
GLIBC_2.4 __clog10 F
GLIBC_2.4 __clog10f F
diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist
index 58316c96ae..e7cd739a54 100644
--- a/sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist
@@ -882,3 +882,5 @@ GLIBC_2.35 fminimumf64 F
GLIBC_2.35 fminimuml F
GLIBC_2.35 fsqrt F
GLIBC_2.35 fsqrtl F
+GLIBC_2.35 hypot F
+GLIBC_2.35 hypotf F
diff --git a/sysdeps/unix/sysv/linux/microblaze/be/libm.abilist b/sysdeps/unix/sysv/linux/microblaze/be/libm.abilist
index b5e5da0272..274ecff630 100644
--- a/sysdeps/unix/sysv/linux/microblaze/be/libm.abilist
+++ b/sysdeps/unix/sysv/linux/microblaze/be/libm.abilist
@@ -843,3 +843,5 @@ GLIBC_2.35 fminimumf64 F
GLIBC_2.35 fminimuml F
GLIBC_2.35 fsqrt F
GLIBC_2.35 fsqrtl F
+GLIBC_2.35 hypot F
+GLIBC_2.35 hypotf F
diff --git a/sysdeps/unix/sysv/linux/microblaze/le/libm.abilist b/sysdeps/unix/sysv/linux/microblaze/le/libm.abilist
index b5e5da0272..274ecff630 100644
--- a/sysdeps/unix/sysv/linux/microblaze/le/libm.abilist
+++ b/sysdeps/unix/sysv/linux/microblaze/le/libm.abilist
@@ -843,3 +843,5 @@ GLIBC_2.35 fminimumf64 F
GLIBC_2.35 fminimuml F
GLIBC_2.35 fsqrt F
GLIBC_2.35 fsqrtl F
+GLIBC_2.35 hypot F
+GLIBC_2.35 hypotf F
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/libm.abilist b/sysdeps/unix/sysv/linux/mips/mips32/libm.abilist
index 4113d3170d..08b902118d 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/libm.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips32/libm.abilist
@@ -842,4 +842,6 @@ GLIBC_2.35 fminimumf64 F
GLIBC_2.35 fminimuml F
GLIBC_2.35 fsqrt F
GLIBC_2.35 fsqrtl F
+GLIBC_2.35 hypot F
+GLIBC_2.35 hypotf F
GLIBC_2.4 exp2l F
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/libm.abilist b/sysdeps/unix/sysv/linux/mips/mips64/libm.abilist
index 18fe9cc57a..09bb3bd75b 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/libm.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips64/libm.abilist
@@ -1144,3 +1144,5 @@ GLIBC_2.35 fminimumf64x F
GLIBC_2.35 fminimuml F
GLIBC_2.35 fsqrt F
GLIBC_2.35 fsqrtl F
+GLIBC_2.35 hypot F
+GLIBC_2.35 hypotf F
diff --git a/sysdeps/unix/sysv/linux/nios2/libm.abilist b/sysdeps/unix/sysv/linux/nios2/libm.abilist
index 3a2b34ecc2..11abbb5668 100644
--- a/sysdeps/unix/sysv/linux/nios2/libm.abilist
+++ b/sysdeps/unix/sysv/linux/nios2/libm.abilist
@@ -843,3 +843,5 @@ GLIBC_2.35 fminimumf64 F
GLIBC_2.35 fminimuml F
GLIBC_2.35 fsqrt F
GLIBC_2.35 fsqrtl F
+GLIBC_2.35 hypot F
+GLIBC_2.35 hypotf F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist
index 740cc8f55b..1688809c36 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist
@@ -888,6 +888,8 @@ GLIBC_2.35 fminimumf64 F
GLIBC_2.35 fminimuml F
GLIBC_2.35 fsqrt F
GLIBC_2.35 fsqrtl F
+GLIBC_2.35 hypot F
+GLIBC_2.35 hypotf F
GLIBC_2.4 __clog10l F
GLIBC_2.4 __finitel F
GLIBC_2.4 __fpclassifyl F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist
index 16fb30566b..e880cebd78 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist
@@ -887,6 +887,8 @@ GLIBC_2.35 fminimumf64 F
GLIBC_2.35 fminimuml F
GLIBC_2.35 fsqrt F
GLIBC_2.35 fsqrtl F
+GLIBC_2.35 hypot F
+GLIBC_2.35 hypotf F
GLIBC_2.4 __clog10l F
GLIBC_2.4 __finitel F
GLIBC_2.4 __fpclassifyl F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libm.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libm.abilist
index ad4b98c09a..033385dfc1 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libm.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libm.abilist
@@ -881,6 +881,8 @@ GLIBC_2.35 fminimumf64 F
GLIBC_2.35 fminimuml F
GLIBC_2.35 fsqrt F
GLIBC_2.35 fsqrtl F
+GLIBC_2.35 hypot F
+GLIBC_2.35 hypotf F
GLIBC_2.4 __clog10l F
GLIBC_2.4 __finitel F
GLIBC_2.4 __fpclassifyl F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libm.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libm.abilist
index 955765051c..7923d428bc 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libm.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libm.abilist
@@ -1316,3 +1316,5 @@ GLIBC_2.35 fminimumf64x F
GLIBC_2.35 fminimuml F
GLIBC_2.35 fsqrt F
GLIBC_2.35 fsqrtl F
+GLIBC_2.35 hypot F
+GLIBC_2.35 hypotf F
diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist
index 1f5bd7754d..9a84163089 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist
@@ -1145,6 +1145,8 @@ GLIBC_2.35 fminimumf64x F
GLIBC_2.35 fminimuml F
GLIBC_2.35 fsqrt F
GLIBC_2.35 fsqrtl F
+GLIBC_2.35 hypot F
+GLIBC_2.35 hypotf F
GLIBC_2.4 __clog10l F
GLIBC_2.4 __finitel F
GLIBC_2.4 __fpclassifyl F
diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist
index 0b18481f39..174bde4fa0 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist
@@ -1145,6 +1145,8 @@ GLIBC_2.35 fminimumf64x F
GLIBC_2.35 fminimuml F
GLIBC_2.35 fsqrt F
GLIBC_2.35 fsqrtl F
+GLIBC_2.35 hypot F
+GLIBC_2.35 hypotf F
GLIBC_2.4 __clog10l F
GLIBC_2.4 __finitel F
GLIBC_2.4 __fpclassifyl F
diff --git a/sysdeps/unix/sysv/linux/sh/be/libm.abilist b/sysdeps/unix/sysv/linux/sh/be/libm.abilist
index f525a9e77e..1e1324d667 100644
--- a/sysdeps/unix/sysv/linux/sh/be/libm.abilist
+++ b/sysdeps/unix/sysv/linux/sh/be/libm.abilist
@@ -842,4 +842,6 @@ GLIBC_2.35 fminimumf64 F
GLIBC_2.35 fminimuml F
GLIBC_2.35 fsqrt F
GLIBC_2.35 fsqrtl F
+GLIBC_2.35 hypot F
+GLIBC_2.35 hypotf F
GLIBC_2.4 exp2l F
diff --git a/sysdeps/unix/sysv/linux/sh/le/libm.abilist b/sysdeps/unix/sysv/linux/sh/le/libm.abilist
index f525a9e77e..1e1324d667 100644
--- a/sysdeps/unix/sysv/linux/sh/le/libm.abilist
+++ b/sysdeps/unix/sysv/linux/sh/le/libm.abilist
@@ -842,4 +842,6 @@ GLIBC_2.35 fminimumf64 F
GLIBC_2.35 fminimuml F
GLIBC_2.35 fsqrt F
GLIBC_2.35 fsqrtl F
+GLIBC_2.35 hypot F
+GLIBC_2.35 hypotf F
GLIBC_2.4 exp2l F
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist
index 727d1ce707..217e6eff7f 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist
@@ -1152,6 +1152,8 @@ GLIBC_2.35 fminimumf64x F
GLIBC_2.35 fminimuml F
GLIBC_2.35 fsqrt F
GLIBC_2.35 fsqrtl F
+GLIBC_2.35 hypot F
+GLIBC_2.35 hypotf F
GLIBC_2.4 __clog10l F
GLIBC_2.4 __finitel F
GLIBC_2.4 __fpclassifyl F
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist
index 0f57574523..6b53b0c59f 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist
@@ -1144,3 +1144,5 @@ GLIBC_2.35 fminimumf64x F
GLIBC_2.35 fminimuml F
GLIBC_2.35 fsqrt F
GLIBC_2.35 fsqrtl F
+GLIBC_2.35 hypot F
+GLIBC_2.35 hypotf F
diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libm.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libm.abilist
index 574789e061..dbefbc3a1a 100644
--- a/sysdeps/unix/sysv/linux/x86_64/64/libm.abilist
+++ b/sysdeps/unix/sysv/linux/x86_64/64/libm.abilist
@@ -1177,3 +1177,5 @@ GLIBC_2.35 fminimumf64x F
GLIBC_2.35 fminimuml F
GLIBC_2.35 fsqrt F
GLIBC_2.35 fsqrtl F
+GLIBC_2.35 hypot F
+GLIBC_2.35 hypotf F
diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist
index 1dc89b304d..8001d0f219 100644
--- a/sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist
+++ b/sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist
@@ -1177,3 +1177,5 @@ GLIBC_2.35 fminimumf64x F
GLIBC_2.35 fminimuml F
GLIBC_2.35 fsqrt F
GLIBC_2.35 fsqrtl F
+GLIBC_2.35 hypot F
+GLIBC_2.35 hypotf F
--
2.32.0
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v2 8/9] i386: Move hypot implementation to C
2021-10-25 11:57 ` [PATCH v2 8/9] i386: Move hypot implementation to C Adhemerval Zanella
@ 2021-10-25 17:10 ` Joseph Myers
2021-11-01 17:23 ` Adhemerval Zanella
0 siblings, 1 reply; 18+ messages in thread
From: Joseph Myers @ 2021-10-25 17:10 UTC (permalink / raw)
To: Adhemerval Zanella; +Cc: libc-alpha
On Mon, 25 Oct 2021, Adhemerval Zanella via Libc-alpha wrote:
> + double r = math_narrow_eval (sqrtl (lx * lx + ly * ly));
I'd expect math_narrow_eval to be called on the result cast to double, not
on a value of long double type.
--
Joseph S. Myers
joseph@codesourcery.com
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v2 8/9] i386: Move hypot implementation to C
2021-10-25 17:10 ` Joseph Myers
@ 2021-11-01 17:23 ` Adhemerval Zanella
0 siblings, 0 replies; 18+ messages in thread
From: Adhemerval Zanella @ 2021-11-01 17:23 UTC (permalink / raw)
To: Joseph Myers; +Cc: libc-alpha
On 25/10/2021 14:10, Joseph Myers wrote:
> On Mon, 25 Oct 2021, Adhemerval Zanella via Libc-alpha wrote:
>
>> + double r = math_narrow_eval (sqrtl (lx * lx + ly * ly));
>
> I'd expect math_narrow_eval to be called on the result cast to double, not
> on a value of long double type.
>
Ack.
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v2 1/9] benchtests: Make hypot input random
2021-10-25 11:57 ` [PATCH v2 1/9] benchtests: Make hypot input random Adhemerval Zanella
@ 2021-11-01 17:42 ` H.J. Lu
0 siblings, 0 replies; 18+ messages in thread
From: H.J. Lu @ 2021-11-01 17:42 UTC (permalink / raw)
To: Adhemerval Zanella; +Cc: GNU C Library
On Mon, Oct 25, 2021 at 5:00 AM Adhemerval Zanella via Libc-alpha
<libc-alpha@sourceware.org> wrote:
>
> Instead of inputs based on the algorithm implementation details.
> Abvout 85% tuples have exponents of the two arguments close
> together (+-1 range).
> ---
> benchtests/hypot-inputs | 1015 ++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 1003 insertions(+), 12 deletions(-)
>
> diff --git a/benchtests/hypot-inputs b/benchtests/hypot-inputs
> index e987e5dd1b..d81b1074fc 100644
> --- a/benchtests/hypot-inputs
> +++ b/benchtests/hypot-inputs
> @@ -2,15 +2,1006 @@
> ## args: double:double
> ## ret: double
>
> -## name: overflow
> -0x3.ffffffffffffcp-1024, 0x8p-152
> -## name: higher_two500
> -0x1.000002027941dp+500, 0x1.0000000000001p+500
> -## name: subnormal
> -0x0.fffffffffffffp-1022, 0x0.fffffffffffffp-1022
> -## name: less_two500
> -0x1.fffffffffffffp-501, 0x1.fffffffffffffp-501
> -
> -## name: default
> -3.0 , 4.0
> -5.0 , 4.0
> +# Random inputs with absolute value in [DBL_MIN, DBL_MAX]:
> +# ~85% tuples have exponents of the two arguments close together (+-1).
> +## name: workload-random
> +0x1.8024bd901cb38p+728, 0x1.8bac8e454d756p+728
> +0x1.8bc032ca6bf0cp-216, 0x1.57b49b40dd4e9p-216
> +-0x1.1656a91d4b847p-121, -0x1.0d51e5c39b39fp-121
> +0x1.79a9f378abecap+399, 0x1.59bacb3d9f56ep+400
> +-0x1.49925edb5064ap+843, -0x1.0592668551351p+842
> +0x1.d21c9897128a6p-259, -0x1.51bc0a21de1f3p-258
> +0x1.84cc5fd7258a1p+1014, -0x1.b58fdaf45caabp+1015
> +0x1.1845f813ed3c1p-832, -0x1.d9a5543225b02p+482
> +-0x1.3b08c8b06cdb2p+671, -0x1.29a190173f45fp+898
> +-0x1.30cd15e304027p-894, -0x1.47cd824035adap-895
> +0x1.46ffcb6755169p-246, 0x1.af6583dfdc71cp-246
> +0x1.a2bce0621cbf2p-341, -0x1.b198bc9dfcf99p-342
> +-0x1.cc993b94e931fp-1003, 0x1.33137c3233bcdp-57
> +0x1.00d963a5aa5e5p-678, -0x1.afa61d932704dp-677
> +-0x1.e3eb8a41dd9dbp-111, 0x1.24020ee1501a4p-110
> +0x1.b9127c183259fp-87, -0x1.389f7aa3fd9dfp-86
> +0x1.f8bc32769e759p-395, -0x1.7571a676e4dc2p+558
> +-0x1.29a2a5e6f4a9ap+391, -0x1.52df4c9cd59dap+825
> +-0x1.9022515eddea6p+15, -0x1.15054bc1613b8p+15
> +0x1.191d44da604a5p+571, -0x1.2c476cbaeb92bp+571
> +-0x1.4e9ed60b9276dp-542, -0x1.d1e9d01666a2ep+332
> +0x1.f9bf6b717a9fcp+414, -0x1.19a08f5c7f872p+413
> +0x1.b9dbc74c2e58fp-440, 0x1.e256d7b07c9b1p-441
> +-0x1.8343d5c51f3a9p+859, -0x1.8ef0822b27ed1p+858
> +-0x1.5e5b1762e5881p-404, 0x1.f5ff3a8167c04p-17
> +0x1.1e904c9fc00d1p+959, 0x1.f6c31b0ccd1a9p+959
> +-0x1.7fa4a8addb08bp+51, 0x1.90ed72f6b62c7p+52
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> +-0x1.18ca40cc0d631p-554, 0x1.094d5bdc0d8edp-553
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> +0x1.5e34caa15dc85p+93, -0x1.64d6f00a200bep+5
> +-0x1.18e9a0dbb019ap-786, 0x1.4b72db47887d1p-786
> +-0x1.502b4d222c42fp+560, 0x1.44337e028971ep-664
> +0x1.fe99bd1c0acb2p-77, 0x1.6b0fd4d1cdf3fp-76
> +-0x1.c70140e5cab05p+559, 0x1.c88eb74beb422p+558
> +-0x1.03715ffc7ca4dp-895, 0x1.f7c48f107655cp-894
> +-0x1.ada02f7614c31p+83, -0x1.7dc541253e353p+84
> +-0x1.f00578b6c5591p-596, -0x1.921b6f68a1bep-595
> +-0x1.b3cabf73e1824p+172, 0x1.2bae1011c61dap+172
> +0x1.a314c38db7ad9p-515, 0x1.8a614bae70008p-514
> +-0x1.47f40f102d876p+658, 0x1.f8abb06fbf3d3p+657
> +-0x1.b28754f5f0b09p-957, 0x1.2da0687cebf82p-958
> +-0x1.f6aeb9d927e84p+671, 0x1.bd6423bb2fe39p+671
> +-0x1.72f9819665063p-918, -0x1.b9b6f5cfd5019p-918
> +-0x1.9a0c3ad9f5972p+0, -0x1.76c93469a33dep-53
> +-0x1.7da191253de34p-245, -0x1.36bc3555dd5f2p-245
> +-0x1.5451bdba2f217p-155, 0x1.110739635119ep-156
> +-0x1.9869ee239a096p+665, -0x1.35d6defac7e89p+665
> +-0x1.24298f40f81bbp-796, 0x1.2f873ad19b6fp-797
> +0x1.35a76404e4568p+626, 0x1.659546ef3e5afp+626
> +-0x1.bc0ea0b50eaacp-525, -0x1.840a2ddac03d8p-524
> +-0x1.8fdb4ea36a0c4p-30, -0x1.fa3b3c9f46928p-30
> +0x1.dd28303f153c2p-856, -0x1.986d280d88e3cp-856
> +-0x1.14f9684c3c7f6p-270, -0x1.9807824f61d16p-270
> +0x1.9e6832c67dd64p+779, -0x1.2e765d75194f7p+780
> +0x1.c93aa3e3409cap+599, 0x1.b025d5c14c47fp+600
> +-0x1.f66272d9b89b1p-818, -0x1.9aa5a3e8e49bp-818
> +-0x1.889e12116d352p-739, -0x1.2a73e7dd47771p-738
> +0x1.912d320743a8dp+167, 0x1.7218c87bc45b7p+166
> +0x1.5fa4ed3e97345p-553, -0x1.24de78ff8563fp-554
> +-0x1.065e327c9b395p-434, -0x1.c3fe52783ad5fp-435
> +-0x1.3e84ba2fb45b3p+584, 0x1.ab8915611e53fp+585
> +-0x1.c0839021cb37bp-256, -0x1.8336b1b181378p-256
> +0x1.84c26765d69b1p-409, -0x1.308eb334cde0fp-409
> +0x1.4511111b2cebp-93, 0x1.1385b1127536dp-94
> +-0x1.c66b3976ad13bp+898, -0x1.8f74bf1764742p+290
> +-0x1.2497ad675228cp-474, 0x1.1770682ab7138p-333
> +-0x1.5db7293e5ab2cp+186, -0x1.5f5eaa677a5fbp+186
> +-0x1.0f1b381f8a2bfp+405, 0x1.0c83a594500cdp+837
> +0x1.2cb5b964566f6p-20, 0x1.7b32e271c3e45p-19
> +-0x1.33754483bcfb1p+912, 0x1.d92fdf87eaaeap-1021
> +0x1.058f7ed613e62p-9, 0x1.2bb4d21f1c8d3p-990
> +0x1.d41c96f8db6b3p+551, -0x1.89b9fc8ac9022p+551
> +0x1.69ba56673a7d1p+702, -0x1.f8e8b5a256633p+702
> +-0x1.09089599bb2ccp-642, -0x1.9afd8ea9cd974p-642
> +0x1.5ef57186efd49p+494, 0x1.46b4fd0db187ap+495
> +0x1.fedc8f6c53ce8p+159, -0x1.6d0cbe9cf51c2p+158
> +-0x1.0e82e1a04685cp+649, -0x1.bdc816b3cc742p+648
> +0x1.da6bdca95f124p-297, -0x1.36a151b609e4ep-298
> +0x1.23bde81d51f8p+752, 0x1.a046aadeb1a8fp+751
> +0x1.d7d46e00a9fb3p-97, -0x1.9990e998b16ffp+781
> +-0x1.9164c139a28ebp+876, 0x1.a309e3e7721bbp+875
> +-0x1.5372456ccc9cap+549, -0x1.12d6533bbb58p+550
> +-0x1.abd54c537fcp-830, 0x1.13bfdb7409b22p-831
> +0x1.389bbf0918f6ap+107, 0x1.4a043d020dfefp+107
> +-0x1.4297a01dd25ap-312, 0x1.809eb4a492906p-368
> +0x1.f3e364918b1c3p-470, 0x1.5af89603133dbp-469
> +0x1.f3ccabb235adcp-718, 0x1.996fac5cecd33p-718
> +-0x1.33786030cff04p+890, 0x1.35181849c038dp+891
> +0x1.24ff1b13cfe37p+463, -0x1.1fb9d11492b24p+463
> +-0x1.2143ea9548c8cp-245, -0x1.f5b0959c85433p+731
> +0x1.e924f233f5f07p-237, -0x1.6bf01ec73f424p-236
> +0x1.b1161d0a87142p-539, 0x1.28c2cf77a4f06p-540
> +-0x1.38766e1295d2bp-132, 0x1.40cd20d6912d5p-131
> +-0x1.a106f43f62cdcp-785, -0x1.19b6f1b6f809p-786
> +0x1.214df5924426fp+7, -0x1.118e2a4ac1f58p+7
> +-0x1.97baeb41d8497p+606, -0x1.174d945d4c5abp+605
> +0x1.f4a6dd3a2e036p-955, 0x1.1ab97dce28be6p-955
> +-0x1.efc50ae42a2c7p+121, 0x1.52b2681fbff2fp+121
> +-0x1.af683672e8ce1p+270, 0x1.e5e23021cb783p+269
> +-0x1.3aa35ff8669a5p-561, 0x1.e32317d51251ep-560
> +0x1.a75903d2c6a31p+801, -0x1.6d8b7ba7f3586p+801
> +-0x1.439574e518c51p-918, -0x1.2f421b7d5283dp-918
> +0x1.cad56ff6ccb7ap+415, 0x1.5b539a1a7d2fcp+414
> +-0x1.470c6518e166ep-360, -0x1.b63d3003d7b22p-359
> +0x1.03c0fea78d5cfp+389, -0x1.1b81875c262fbp+388
> +-0x1.5d32c84c0f6d1p+851, 0x1.969b92c842a84p+850
> +-0x1.9d0e9a35a4081p-375, 0x1.6aecc62eca3d6p-623
> +0x1.15991365bd4a5p-72, 0x1.5e3f477594afep-71
> +-0x1.d9acf519d66dap-55, -0x1.31ce2bc104947p-55
> +0x1.707b099362987p-655, -0x1.1ea1b62999ce4p-656
> +0x1.271b47e273072p+947, 0x1.8ba01426f03fap+946
> +0x1.1a12a7a3b3f03p+480, -0x1.953e863d9422ep+479
> +0x1.20120aeb5f1c1p-38, 0x1.f89f6352d7cbfp-37
> +0x1.45e590a8ecf02p+567, -0x1.41cbf11597507p+566
> +0x1.ea0ae387ab8c8p+538, 0x1.58145e3765a3dp+933
> +0x1.770179372db6ep+924, -0x1.5f3663e6049ebp+925
> +0x1.ddb912a2615b8p+84, 0x1.cd3a130ab14bfp+85
> +0x1.feb59bf1ab657p+469, 0x1.bc650f3db8b2dp+469
> +-0x1.685a915cbfae3p-387, 0x1.ecf85d7bc92a7p-388
> +-0x1.3c32c4d576c9cp-402, -0x1.3ab7100d300bep-403
> +0x1.da62433c04a6bp-289, -0x1.4cbc9c02f796bp+675
> +0x1.50bcb06a167ecp-568, 0x1.1939ce1ca13efp-568
> +0x1.54c47d8d7a641p-657, 0x1.995fec8215f43p-364
> +-0x1.56829ebbbf7f9p-576, 0x1.50e384fdfb364p-968
> +0x1.1fffad2d1873cp+544, -0x1.8ad8466a7b0ffp+544
> +-0x1.cc793bb2ad46fp+145, -0x1.d8df7d6e8b8cap-721
> +-0x1.d20810e955f06p-804, 0x1.9d32de05c340ap-805
> +-0x1.fc1319cd8d195p+940, 0x1.cadc3da9d433ap+941
> +-0x1.de6c8dd3851ffp+208, -0x1.61c32de7b4b8fp+207
> +0x1.487e6a5e39177p+294, 0x1.c6dc8434e389p+295
> +-0x1.913ca39af7ca5p+361, -0x1.bffa968c0a173p+360
> +0x1.be0d57276a8a7p+730, -0x1.b847375b1653bp+730
> +-0x1.7c2e305e120afp+1020, 0x1.92491b9660f19p+596
> +-0x1.7869c47b9c518p-586, 0x1.65a0a3aade8bfp-586
> +0x1.c3e3a0289ba9dp+454, 0x1.7c2992b6b0b0bp+455
> +-0x1.9e1252bb328d9p+995, -0x1.2198b0970a787p+995
> +0x1.d76bbaef4f316p+731, -0x1.892f930e1327bp+731
> +-0x1.0782bbe094e6dp-133, 0x1.f43a2815725dap-132
> +-0x1.2e1bb20304cbbp-138, 0x1.7b7c9af089cdp-138
> +0x1.22bba80d51fd1p+280, 0x1.cc651706b9b5cp+281
> +0x1.dc883891640b9p-848, -0x1.799dc68c3f71ep-849
> --
> 2.32.0
>
LGTM.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
Thanks.
--
H.J.
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v2 2/9] benchtests: Add hypotf
2021-10-25 11:57 ` [PATCH v2 2/9] benchtests: Add hypotf Adhemerval Zanella
@ 2021-11-01 17:42 ` H.J. Lu
0 siblings, 0 replies; 18+ messages in thread
From: H.J. Lu @ 2021-11-01 17:42 UTC (permalink / raw)
To: Adhemerval Zanella; +Cc: GNU C Library
On Mon, Oct 25, 2021 at 4:59 AM Adhemerval Zanella via Libc-alpha
<libc-alpha@sourceware.org> wrote:
>
> Based on random input arguments. About 85% tuples have exponents
> of the two arguments close together (+-1 range).
> ---
> benchtests/Makefile | 2 +-
> benchtests/hypotf-inputs | 1007 ++++++++++++++++++++++++++++++++++++++
> 2 files changed, 1008 insertions(+), 1 deletion(-)
> create mode 100644 benchtests/hypotf-inputs
>
> diff --git a/benchtests/Makefile b/benchtests/Makefile
> index 4fcd73131a..ad4bbf2912 100644
> --- a/benchtests/Makefile
> +++ b/benchtests/Makefile
> @@ -26,7 +26,7 @@ bench-math := acos acosh asin asinh atan atanh cos cosh exp exp2 log log2 \
> fmaxf powf trunc truncf roundeven roundevenf expf exp2f logf \
> log2f sincosf sinf cosf isnan isinf isfinite hypot logb logbf \
> exp10f ilogb ilogbf cbrt erf erfc exp10 expm1 j0 j1 lgamma \
> - log10 log1p tgamma y0 y1 atan2
> + log10 log1p tgamma y0 y1 atan2 hypotf
>
> ifneq (,$(filter yes,$(float96-fcts)))
> bench-math += cbrtl
> diff --git a/benchtests/hypotf-inputs b/benchtests/hypotf-inputs
> new file mode 100644
> index 0000000000..7fd309a1df
> --- /dev/null
> +++ b/benchtests/hypotf-inputs
> @@ -0,0 +1,1007 @@
> +## includes: math.h
> +## args: float:float
> +## ret: float
> +
> +# Random inputs with absolute value in [FLT_MIN, FTL_MAX]:
> +# ~85% tuples have exponents of the two arguments close together (+-1).
> +## name: workload-random
> +0x1.b37faep-59, -0x1.443f1ep-85
> +-0x1.b00438p+31, -0x1.3ee7b6p+31
> +-0x1.48dfa2p-37, -0x1.7ac1d2p-37
> +-0x1.83f736p+107, -0x1.88b26cp+109
> +0x1.83ed54p+91, 0x1.55d334p+93
> +-0x1.47ebeap-111, -0x1.dc808p-109
> +-0x1.1b0d96p-31, -0x1.dfc498p-33
> +0x1.e1bbd8p+71, 0x1.16f5aap+69
> +-0x1.e384dap+53, -0x1.42407ap+51
> +0x1.e94eccp+3, 0x1.ec1a74p+5
> +0x1.98b656p-87, 0x1.ff4ebep-87
> +0x1.d0bfcap-125, 0x1.758378p-128
> +-0x1.47e2d2p+109, -0x1.837feap+109
> +-0x1.fe575p-67, -0x1.d41e62p-65
> +-0x1.d9f5a8p+53, -0x1.98ef0ap+55
> +0x1.254ebp+127, -0x1.dbe9fp-129
> +0x1.20d48cp+69, 0x1.e6f02cp+67
> +0x1.8ed386p-87, 0x1.7e75cap-89
> +0x1.f2692ep+41, 0x1.6cdc8p+41
> +0x1.8040e8p+61, 0x1.d20d7ep+63
> +-0x1.4a1e16p-111, -0x1.b67c92p-113
> +0x1.3c858ap+51, 0x1.097ddap+53
> +0x1.5e8616p+49, 0x1.dd3cp+5
> +0x1.0204p+41, 0x1.5eed7cp+41
> +-0x1.e5b88p-43, -0x1.119f38p-65
> +0x1.b77c7ep+81, 0x1.f2c3bep+79
> +-0x1.c4f224p-127, -0x1.935828p-127
> +0x1.4c357cp-125, 0x1.b48d6ep-125
> +0x1.7af80ap+17, 0x1.3cabd8p+15
> +0x1.e2ffbap-13, 0x1.da2e0cp+127
> +-0x1.42ff0cp+101, -0x1.187314p+99
> +-0x1.a9f91p+49, -0x1.bc7a8p+51
> +0x1.40d9ccp-15, 0x1.1698f6p-13
> +0x1.441928p+119, 0x1.53437cp+121
> +0x1.4c83c6p+113, 0x1.d93ed8p+111
> +-0x1.26c22ep-93, -0x1.7df728p-91
> +-0x1.1d37cap+45, -0x1.655034p+47
> +0x1.0e87cap+33, 0x1.17b8dep+33
> +-0x1.45d096p-39, -0x1.ecc78cp-41
> +-0x1.a0eb34p+25, -0x1.fe9774p+23
> +-0x1.f61bc8p+53, -0x1.f04d26p+53
> +0x1.648eb8p+119, 0x1.77724cp+119
> +0x1.96f20ap+25, 0x1.f242aep+25
> +0x1.a70ee2p-25, 0x1.90f996p-25
> +-0x1.07f2fp+23, -0x1.4c2526p+25
> +0x1.90f74ep+97, 0x1.8d3d32p+95
> +0x1.8095e2p-73, -0x1.77349p-119
> +0x1.685484p+25, 0x1.92976ep+27
> +-0x1.33fb5ap+91, -0x1.a80c78p+93
> +0x1.750e36p+105, 0x1.ae37a6p+65
> +-0x1.29f6d4p+103, -0x1.0cae78p+101
> +0x1.37aa9p-33, 0x1.ed4146p-31
> +0x1.69cab6p-75, -0x1.7c0708p+63
> +0x1.3011f6p+99, 0x1.576df4p+99
> +-0x1.8d5fcep+97, -0x1.0bde36p+97
> +-0x1.9fe7c2p-15, -0x1.f953f4p-15
> +0x1.49812p-73, 0x1.4b3fdcp-75
> +-0x1.7fce3ap-31, -0x1.cc3362p-29
> +0x1.74aa9cp+103, 0x1.c64796p+25
> +-0x1.1fc96p-73, -0x1.5a2206p-73
> +-0x1.625c56p+55, -0x1.f270fcp+53
> +0x1.4af82ep+85, 0x1.f5e83cp+87
> +0x1.db2792p-9, 0x1.6f8a84p-9
> +0x1.de4236p+11, 0x1.30a826p+9
> +0x1.8175dap+41, 0x1.7ce866p+39
> +-0x1.904ac2p+15, -0x1.d8b98ep+15
> +0x1.16b22ep+39, 0x1.3449a6p+37
> +0x1.e7537cp-29, 0x1.305d1cp-29
> +-0x1.9e4b6cp-83, -0x1.a0891ap-83
> +0x1.d1ba72p+59, 0x1.14827ap+59
> +0x1.e23392p-57, 0x1.02a852p-55
> +0x1.508884p+43, 0x1.f24b8p+45
> +-0x1.28083p-13, -0x1.2f259cp-13
> +0x1.2ec386p-21, 0x1.a15d1p-21
> +0x1.34c062p-3, 0x1.2d27fap-1
> +-0x1.ce9968p+85, -0x1.1aff0cp+83
> +-0x1.357972p-125, -0x1.a7f24cp-107
> +-0x1.80b35ep-43, -0x1.295f72p-43
> +0x1.7a92e2p-23, 0x1.4945dap-21
> +0x1.49df6p-71, 0x1.3efabcp-71
> +-0x1.fd4cd8p-15, -0x1.b177a8p-13
> +-0x1.39dda6p-113, -0x1.30fe8ap-19
> +-0x1.921016p-111, -0x1.78a92ap-111
> +-0x1.589e9p+95, -0x1.43996cp+93
> +0x1.8dc652p+31, -0x1.0b2a7ep+3
> +0x1.0c1c5ap+45, 0x1.307ddp+43
> +0x1.15b21cp+17, 0x1.c2bb9p+17
> +0x1.f1727ap-89, 0x1.ba819cp-87
> +0x1.673e3ep-7, 0x1.73e1f4p-85
> +-0x1.76ebdcp-25, -0x1.b32b56p-23
> +0x1.4c275ep+9, 0x1.9e3d5ap+9
> +0x1.130b58p-121, 0x1.9f1d6p-123
> +-0x1.f1ef42p+35, -0x1.74723ap+37
> +0x1.62ed8ap+43, 0x1.c3f4dep+43
> +0x1.1243e2p+29, 0x1.99ab58p+31
> +0x1.832e6ep-55, 0x1.8417bp-57
> +-0x1.e8ae9p-129, -0x1.5e7d68p-125
> +-0x1.208b3ap-3, -0x1.2a9884p-1
> +0x1.0edap-113, 0x1.694e1ep-111
> +-0x1.8d43f2p-27, -0x1.c1c9bap-29
> +-0x1.cad948p-113, -0x1.6f1abap+45
> +-0x1.d789e4p+37, -0x1.48e888p+39
> +-0x1.0b26e2p+33, -0x1.30c6d2p+33
> +-0x1.d035fcp-51, -0x1.fd8658p-49
> +0x1.af7e32p+63, 0x1.3f978ap+61
> +0x1.cd9384p+17, 0x1.7681b8p+17
> +0x1.64b27p-11, 0x1.5439cep-13
> +0x1.efbd4ap-67, 0x1.1090e2p-43
> +0x1.a11278p+41, 0x1.38298cp+43
> +-0x1.58d1dcp-39, -0x1.242702p-65
> +0x1.17512p+115, -0x1.8ae69ep-61
> +0x1.e3974p-95, 0x1.03bc34p-97
> +-0x1.f9033p+33, -0x1.245142p+33
> +0x1.c533dap+123, -0x1.016dfp-49
> +-0x1.7842fap-61, -0x1.526a46p-63
> +0x1.2cb57p-37, 0x1.246898p-39
> +0x1.b908cp-59, 0x1.2e58d6p-59
> +-0x1.7742ecp+75, -0x1.161496p+77
> +-0x1.bac1dcp-85, -0x1.3a69e4p-83
> +-0x1.18ee72p-1, 0x1.393ac8p+63
> +-0x1.fa2f22p+1, -0x1.41ap+1
> +-0x1.67de08p-29, 0x1.0ddb36p-109
> +0x1.ec97ccp-3, 0x1.a6e90ap-3
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> +0x1.130814p+75, 0x1.6e415ep+73
> +-0x1.13f524p+19, -0x1.a448b4p+21
> +-0x1.22aef6p-37, -0x1.e70806p-39
> +-0x1.496ae6p+89, -0x1.6ecd24p+91
> +0x1.c092a4p-27, 0x1.e7d0d8p-29
> +0x1.0b83fp-95, 0x1.488ab6p-95
> +-0x1.1fc906p-121, -0x1.3a29dp-1
> +0x1.27a47cp-45, 0x1.aec276p-45
> +0x1.2fb352p+97, 0x1.7095f2p+97
> +0x1.e6fd2ap+121, 0x1.0e6b1cp+123
> +-0x1.f5f54ep+83, 0x1.0e43fp+123
> +-0x1.0895e6p+89, -0x1.3891fp+87
> +-0x1.c02328p-31, -0x1.10c3d2p-31
> --
> 2.32.0
>
LGTM.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
Thanks.
--
H.J.
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v2 4/9] math: Use an improved algorithm for hypot (dbl-64)
2021-10-29 12:38 ` Wilco Dijkstra
@ 2021-10-29 16:20 ` Joseph Myers
0 siblings, 0 replies; 18+ messages in thread
From: Joseph Myers @ 2021-10-29 16:20 UTC (permalink / raw)
To: Wilco Dijkstra; +Cc: 'GNU C Library'
On Fri, 29 Oct 2021, Wilco Dijkstra via Libc-alpha wrote:
> Hi Joseph,
>
> > Scaling down doesn't set the underflow flag if the scaling down was exact
> > (even though the actual hypot operation is inexact and so should raise
> > underflow).
>
> That's true, but doesn't that apply to the float version too? The convert from
> double to float might also be precise (and denormal) even if earlier calculations
> were inexact.
The only case where hypotf can have a mathematical result that is tiny and
inexact is when both arguments are in the subnormal range for float and
the implementation in terms of double then involves computing the (double)
square root of a number M * 2^-298, for some (exact) M in the range [2,
2^46), and then converting that (double) square root to float.
The square root of an integer in the range [2, 2^46) cannot be close
enough to an integer for the result of rounding it in either direction to
53 bits (so at least 30 fractional bits) to be an integer, so it is not
possible for the conversion from double to float to be exact when the
mathematical result of hypotf is tiny and inexact.
--
Joseph S. Myers
joseph@codesourcery.com
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v2 4/9] math: Use an improved algorithm for hypot (dbl-64)
2021-10-28 17:19 ` Joseph Myers
@ 2021-10-29 12:38 ` Wilco Dijkstra
2021-10-29 16:20 ` Joseph Myers
0 siblings, 1 reply; 18+ messages in thread
From: Wilco Dijkstra @ 2021-10-29 12:38 UTC (permalink / raw)
To: Joseph Myers; +Cc: Adhemerval Zanella, 'GNU C Library'
Hi Joseph,
> Scaling down doesn't set the underflow flag if the scaling down was exact
> (even though the actual hypot operation is inexact and so should raise
> underflow).
That's true, but doesn't that apply to the float version too? The convert from
double to float might also be precise (and denormal) even if earlier calculations
were inexact.
Either way, any special case checks that are required should only be done if scale
is not equal to 1.0, like:
h = math_narrow_eval (h * scale);
if (fastpath)
return h;
math_check_force_underflow_nonneg (h);
return handle_errno (h);
Wilco
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v2 4/9] math: Use an improved algorithm for hypot (dbl-64)
2021-10-28 15:19 [PATCH v2 4/9] math: Use an improved algorithm for hypot (dbl-64) Wilco Dijkstra
@ 2021-10-28 17:19 ` Joseph Myers
2021-10-29 12:38 ` Wilco Dijkstra
0 siblings, 1 reply; 18+ messages in thread
From: Joseph Myers @ 2021-10-28 17:19 UTC (permalink / raw)
To: Wilco Dijkstra; +Cc: Adhemerval Zanella, 'GNU C Library'
On Thu, 28 Oct 2021, Wilco Dijkstra via Libc-alpha wrote:
> + h = math_narrow_eval (h * scale);
> + math_check_force_underflow_nonneg (h);
> + return h;
>
> I don't think you need math_check_force_underflow_nonneg at all given
> h * scale should already set the underflow flag correctly. Removing this
> gives performance within ~2% of the original.
Scaling down doesn't set the underflow flag if the scaling down was exact
(even though the actual hypot operation is inexact and so should raise
underflow).
--
Joseph S. Myers
joseph@codesourcery.com
^ permalink raw reply [flat|nested] 18+ messages in thread
* [PATCH v2 4/9] math: Use an improved algorithm for hypot (dbl-64)
@ 2021-10-28 15:19 Wilco Dijkstra
2021-10-28 17:19 ` Joseph Myers
0 siblings, 1 reply; 18+ messages in thread
From: Wilco Dijkstra @ 2021-10-28 15:19 UTC (permalink / raw)
To: Adhemerval Zanella; +Cc: 'GNU C Library'
Hi Adhemerval,
On AArch64 the new version is ~25% slower even after removing wrappers.
Using the faster checks for special cases helps here too of course. However
there is another issue: issignaling is not inlined, forcing a frame to be created
plus several callee-saves. This fixes it:
if (!isfinite(x) || !isfinite(y))
{
if ((isinf (x) || isinf (y))
&& !issignaling_inline (x) && !issignaling_inline (y))
return INFINITY;
return x + y;
}
This gave a 20% speedup, so it is now only a little slower than before.
We could rename the inline function to __issignaling I suppose, and then
it should be used as long as you include math_config.h.
+ h = math_narrow_eval (h * scale);
+ math_check_force_underflow_nonneg (h);
+ return h;
I don't think you need math_check_force_underflow_nonneg at all given
h * scale should already set the underflow flag correctly. Removing this
gives performance within ~2% of the original.
Wilco
^ permalink raw reply [flat|nested] 18+ messages in thread
end of thread, other threads:[~2021-11-01 17:43 UTC | newest]
Thread overview: 18+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-10-25 11:57 [PATCH v2 0/9] Improve hypot() Adhemerval Zanella
2021-10-25 11:57 ` [PATCH v2 1/9] benchtests: Make hypot input random Adhemerval Zanella
2021-11-01 17:42 ` H.J. Lu
2021-10-25 11:57 ` [PATCH v2 2/9] benchtests: Add hypotf Adhemerval Zanella
2021-11-01 17:42 ` H.J. Lu
2021-10-25 11:57 ` [PATCH v2 3/9] math: Simplify hypotf implementation Adhemerval Zanella
2021-10-25 11:57 ` [PATCH v2 4/9] math: Use an improved algorithm for hypot (dbl-64) Adhemerval Zanella
2021-10-25 11:57 ` [PATCH v2 5/9] math: Use an improved algorithm for hypotl (ldbl-96) Adhemerval Zanella
2021-10-25 11:57 ` [PATCH v2 6/9] math: Use an improved algorithm for hypotl (ldbl-128) Adhemerval Zanella
2021-10-25 11:57 ` [PATCH v2 7/9] math: Remove powerpc e_hypot Adhemerval Zanella
2021-10-25 11:57 ` [PATCH v2 8/9] i386: Move hypot implementation to C Adhemerval Zanella
2021-10-25 17:10 ` Joseph Myers
2021-11-01 17:23 ` Adhemerval Zanella
2021-10-25 11:57 ` [PATCH v2 9/9] math: Remove the error handling wrapper from hypot and hypotf Adhemerval Zanella
2021-10-28 15:19 [PATCH v2 4/9] math: Use an improved algorithm for hypot (dbl-64) Wilco Dijkstra
2021-10-28 17:19 ` Joseph Myers
2021-10-29 12:38 ` Wilco Dijkstra
2021-10-29 16:20 ` Joseph Myers
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