* [Bug middle-end/102464] Miss optimization for (_Float16) sqrtf ((float) f16)
2021-09-23 5:55 [Bug middle-end/102464] New: Miss optimization for (_Float16) sqrtf ((float) f16) crazylht at gmail dot com
@ 2021-09-23 5:59 ` crazylht at gmail dot com
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To: gcc-bugs
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--- Comment #1 from Hongtao.liu <crazylht at gmail dot com> ---
Similar optimization also applies for
fma
fmax/fmin
fabs
ldexp
ceil
floor
trunc
round
rint
nearbyint
copysign
Since AVX512-FP16 has corresponding instructions.
^ permalink raw reply [flat|nested] 18+ messages in thread* [Bug middle-end/102464] Miss optimization for (_Float16) sqrtf ((float) f16)
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2021-09-23 5:59 ` [Bug middle-end/102464] " crazylht at gmail dot com
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To: gcc-bugs
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
Last reconfirmed| |2021-09-23
Keywords| |internal-improvement
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.
fabs and fma I don't think they need to be internal functions as there are
already tree codes for them.
^ permalink raw reply [flat|nested] 18+ messages in thread* [Bug middle-end/102464] Miss optimization for (_Float16) sqrtf ((float) f16)
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
There's related optimizations in convert () which should ideally move to
match.pd
^ permalink raw reply [flat|nested] 18+ messages in thread* [Bug middle-end/102464] Miss optimization for (_Float16) sqrtf ((float) f16)
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--- Comment #4 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
Note that for fma this would only be valid for
-funsafe-math-optimizations.
^ permalink raw reply [flat|nested] 18+ messages in thread* [Bug middle-end/102464] Miss optimization for (_Float16) sqrtf ((float) f16)
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--- Comment #5 from Hongtao.liu <crazylht at gmail dot com> ---
(gdb) p direct_internal_fn_supported_p (IFN_CEIL, type, OPTIMIZE_FOR_BOTH)
$110 = false
(gdb) p direct_internal_fn_supported_p (IFN_SQRT, type, OPTIMIZE_FOR_BOTH)
$111 = true
hmm, why?
^ permalink raw reply [flat|nested] 18+ messages in thread* [Bug middle-end/102464] Miss optimization for (_Float16) sqrtf ((float) f16)
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--- Comment #6 from Hongtao.liu <crazylht at gmail dot com> ---
(In reply to Hongtao.liu from comment #5)
> (gdb) p direct_internal_fn_supported_p (IFN_CEIL, type, OPTIMIZE_FOR_BOTH)
> $110 = false
>
> (gdb) p direct_internal_fn_supported_p (IFN_SQRT, type, OPTIMIZE_FOR_BOTH)
> $111 = true
>
> hmm, why?
Hmm, Because in ix86_optab_supported_p, we have
case rint_optab:
if ((SSE_FLOAT_MODE_P (mode1)
&& TARGET_SSE_MATH
&& !flag_trapping_math
&& !TARGET_SSE4_1))
return opt_type == OPTIMIZE_FOR_SPEED;
return true;
case floor_optab:
case ceil_optab:
case btrunc_optab:
if ((SSE_FLOAT_MODE_P (mode1)
&& TARGET_SSE_MATH
&& !flag_trapping_math
&& TARGET_SSE4_1)
return true;
return opt_type == OPTIMIZE_FOR_SPEED;
^ permalink raw reply [flat|nested] 18+ messages in thread* [Bug middle-end/102464] Miss optimization for (_Float16) sqrtf ((float) f16)
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--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by hongtao Liu <liuhongt@gcc.gnu.org>:
https://gcc.gnu.org/g:613196462a62a28de8414b9023ec2be9a29ac3dc
commit r12-4242-g613196462a62a28de8414b9023ec2be9a29ac3dc
Author: liuhongt <hongtao.liu@intel.com>
Date: Fri Sep 24 19:17:42 2021 +0800
Simplify (_Float16) ceil ((double) x) to .CEIL (x) when available.
gcc/ChangeLog:
PR target/102464
* config/i386/i386.c (ix86_optab_supported_p):
Return true for HFmode.
* match.pd: Simplify (_Float16) ceil ((double) x) to
__builtin_ceilf16 (a) when a is _Float16 type and
direct_internal_fn_supported_p.
gcc/testsuite/ChangeLog:
* gcc.target/i386/pr102464.c: New test.
^ permalink raw reply [flat|nested] 18+ messages in thread* [Bug middle-end/102464] Miss optimization for (_Float16) sqrtf ((float) f16)
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To: gcc-bugs
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--- Comment #8 from Hongtao.liu <crazylht at gmail dot com> ---
(In reply to Richard Biener from comment #3)
> There's related optimizations in convert () which should ideally move to
> match.pd
When i try to mov convert stuffs to match.pd, i find some "mismatch", there's 3
cases
1. math functions are transformed under condition "optimize"
2. math functions are transformed under condition "optimize &&
flag_unsafe_math_optimizations"
3. math functions are transformed under condition "optimize &&
flag_unsafe_math_optimizations flag_errno_maths"
And for logb, it's case 1, which means it can be transformed w/o
!flag_errno_maths, but according to DEF_C99_BUILTIN (BUILT_IN_LOGB,
"logb", BT_FN_DOUBLE_DOUBLE, ATTR_MATHFN_FPROUNDING_ERRNO), !flag_errno_maths
is needed and the transformation will be prevented by
gimple-match-head.c：maybe_push_res_to_seq
/* We can't and should not emit calls to non-const functions. */
if (!(flags_from_decl_or_type (decl) & ECF_CONST))
return NULL;
/* fabsl (extend(x)) -> extend(fabsf(x)), etc., if x is a float. */
(for froms (BUILT_IN_FABS BUILT_IN_FABSL
BUILT_IN_LOGB BUILT_IN_LOGBL)
tos (BUILT_IN_FABSF BUILT_IN_FABSF
BUILT_IN_LOGBF BUILT_IN_LOGBF)
(simplify
(froms (convert float_value_p@0))
(if (optimize && canonicalize_math_p ()
&& mathfn_built_in (TREE_TYPE (@0), froms))
(convert (tos @0)))))
^ permalink raw reply [flat|nested] 18+ messages in thread* [Bug middle-end/102464] Miss optimization for (_Float16) sqrtf ((float) f16)
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--- Comment #9 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by hongtao Liu <liuhongt@gcc.gnu.org>:
https://gcc.gnu.org/g:1a07bc9cda77b1211e95ae295b30e46c0d9ee222
commit r12-4651-g1a07bc9cda77b1211e95ae295b30e46c0d9ee222
Author: liuhongt <hongtao.liu@intel.com>
Date: Mon Oct 25 10:51:33 2021 +0800
Simplify (_Float16) sqrtf((float) a) to .SQRT(a) when a is a _Float16
value.
Similar for sqrt/sqrtl.
gcc/ChangeLog:
PR target/102464
* match.pd: Simplify (_Float16) sqrtf((float) a) to .SQRT(a)
when direct_internal_fn_supported_p, similar for sqrt/sqrtl.
gcc/testsuite/ChangeLog:
PR target/102464
* gcc.target/i386/pr102464-sqrtph.c: New test.
* gcc.target/i386/pr102464-sqrtsh.c: New test.
^ permalink raw reply [flat|nested] 18+ messages in thread* [Bug middle-end/102464] Miss optimization for (_Float16) sqrtf ((float) f16)
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--- Comment #10 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by hongtao Liu <liuhongt@gcc.gnu.org>:
https://gcc.gnu.org/g:84bcefd5555af6d95e08cd980965098961289215
commit r12-4780-g84bcefd5555af6d95e08cd980965098961289215
Author: liuhongt <hongtao.liu@intel.com>
Date: Mon Oct 25 15:20:35 2021 +0800
Enable vectorization for _Float16 floor/ceil/trunc/nearbyint/rint
operations.
gcc/ChangeLog:
PR target/102464
* config/i386/i386-builtin-types.def (V8HF_FTYPE_V8HF): New
function type.
(V16HF_FTYPE_V16HF): Ditto.
(V32HF_FTYPE_V32HF): Ditto.
(V8HF_FTYPE_V8HF_ROUND): Ditto.
(V16HF_FTYPE_V16HF_ROUND): Ditto.
(V32HF_FTYPE_V32HF_ROUND): Ditto.
* config/i386/i386-builtin.def ( IX86_BUILTIN_FLOORPH,
IX86_BUILTIN_CEILPH, IX86_BUILTIN_TRUNCPH,
IX86_BUILTIN_FLOORPH256, IX86_BUILTIN_CEILPH256,
IX86_BUILTIN_TRUNCPH256, IX86_BUILTIN_FLOORPH512,
IX86_BUILTIN_CEILPH512, IX86_BUILTIN_TRUNCPH512): New builtin.
* config/i386/i386-builtins.c
(ix86_builtin_vectorized_function): Enable vectorization for
HFmode FLOOR/CEIL/TRUNC operation.
* config/i386/i386-expand.c (ix86_expand_args_builtin): Handle
new builtins.
* config/i386/sse.md (rint<mode>2, nearbyint<mode>2): Extend
to vector HFmodes.
gcc/testsuite/ChangeLog:
* gcc.target/i386/pr102464-vrndscaleph.c: New test.
^ permalink raw reply [flat|nested] 18+ messages in thread* [Bug middle-end/102464] Miss optimization for (_Float16) sqrtf ((float) f16)
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--- Comment #11 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by hongtao Liu <liuhongt@gcc.gnu.org>:
https://gcc.gnu.org/g:22ce7382fccc15ce2355306b3f5be7afc00f81f4
commit r12-4881-g22ce7382fccc15ce2355306b3f5be7afc00f81f4
Author: liuhongt <hongtao.liu@intel.com>
Date: Wed Nov 3 16:07:34 2021 +0800
Simplify (trunc)copysign((extend)a, (extend)b) to .COPYSIGN (a,b).
a and b are same type as the truncation type and has less precision
than extend type.
gcc/ChangeLog:
PR target/102464
* match.pd: simplify (trunc)copysign((extend)a, (extend)b) to
.COPYSIGN (a,b) when a and b are same type as the truncation
type and has less precision than extend type.
gcc/testsuite/ChangeLog:
* gcc.target/i386/pr102464-copysign-1.c: New test.
^ permalink raw reply [flat|nested] 18+ messages in thread* [Bug middle-end/102464] Miss optimization for (_Float16) sqrtf ((float) f16)
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--- Comment #12 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by hongtao Liu <liuhongt@gcc.gnu.org>:
https://gcc.gnu.org/g:2ad1e8081f4797a99a96b513ffe14c7305e9b3d8
commit r12-4984-g2ad1e8081f4797a99a96b513ffe14c7305e9b3d8
Author: liuhongt <hongtao.liu@intel.com>
Date: Mon Nov 8 09:19:29 2021 +0800
[Gimple] Simplify (trunc)fma ((extend)a, (extend)b, (extend)c) to IFN_FMA
(a,b, c).
a, b, c are same type as truncation type and has less precision than
extend type, the optimization is guarded under
flag_unsafe_math_optimizations.
gcc/ChangeLog:
PR target/102464
* match.pd: Simplify
(trunc)fma ((extend)a, (extend)b, (extend)c) to IFN_FMA (a, b,
c) under flag_unsafe_math_optimizations.
gcc/testsuite/ChangeLog:
* gcc.target/i386/pr102464-fma.c: New test.
^ permalink raw reply [flat|nested] 18+ messages in thread* [Bug middle-end/102464] Miss optimization for (_Float16) sqrtf ((float) f16)
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--- Comment #13 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by hongtao Liu <liuhongt@gcc.gnu.org>:
https://gcc.gnu.org/g:a1f7ead09cd41d32e2feffff902eb32e587c36e7
commit r12-4985-ga1f7ead09cd41d32e2feffff902eb32e587c36e7
Author: liuhongt <hongtao.liu@intel.com>
Date: Mon Nov 8 09:32:17 2021 +0800
Add !HONOR_SNANS to simplifcation: (trunc)copysign((extend)a, (extend)b) to
copysign (a, b).
> Note that this is not safe with -fsignaling-nans, so needs to be disabled
> for that option (if there isn't already logic somewhere with that
effect),
> because the extend will convert a signaling NaN to quiet (raising
> "invalid"), but copysign won't, so this transformation could result in a
> signaling NaN being wrongly returned when the original code would never
> have returned a signaling NaN.
>
> --
> Joseph S. Myers
> joseph@codesourcery.com
gcc/ChangeLog
PR target/102464
* match.pd (Simplifcation (trunc)copysign((extend)a, (extend)b)
to .COPYSIGN (a, b)): Add !HONOR_SNANS.
^ permalink raw reply [flat|nested] 18+ messages in thread* [Bug middle-end/102464] Miss optimization for (_Float16) sqrtf ((float) f16)
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--- Comment #14 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by hongtao Liu <liuhongt@gcc.gnu.org>:
https://gcc.gnu.org/g:b879d40a17ec0409f1a2cd9ab6134bb28f53eea8
commit r12-5079-gb879d40a17ec0409f1a2cd9ab6134bb28f53eea8
Author: liuhongt <hongtao.liu@intel.com>
Date: Thu Nov 4 16:05:45 2021 +0800
Simplify (trunc)MAX/MIN((extend)a, (extend)b) to MAX/MIN(a,b)
a and b are same type as trunc type and has less precision than
extend type.
gcc/ChangeLog:
PR target/102464
* match.pd: Simplify (trunc)fmax/fmin((extend)a, (extend)b) to
MAX/MIN(a,b)
gcc/testsuite/ChangeLog:
* gcc.target/i386/pr102464-maxmin.c: New test.
^ permalink raw reply [flat|nested] 18+ messages in thread* [Bug middle-end/102464] Miss optimization for (_Float16) sqrtf ((float) f16)
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From: crazylht at gmail dot com @ 2022-02-15 6:44 UTC (permalink / raw)
To: gcc-bugs
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Hongtao.liu <crazylht at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #15 from Hongtao.liu <crazylht at gmail dot com> ---
Fixed in GCC12.
^ permalink raw reply [flat|nested] 18+ messages in thread* [Bug middle-end/102464] Miss optimization for (_Float16) sqrtf ((float) f16)
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To: gcc-bugs
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jbeulich at suse dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jbeulich at suse dot com
--- Comment #16 from jbeulich at suse dot com ---
(In reply to Hongtao.liu from comment #15)
> Fixed in GCC12.
Only almost - the new FMA testcase there fails for i?86-*-*. I don't think even
the few uses of VFMA* actually match the expectations. The majority of the
operations are carried in the FPU anyway, despite -mfpmath=sse.
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From: jbeulich at suse dot com @ 2022-06-27 13:35 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102464
--- Comment #17 from jbeulich at suse dot com ---
Largely the same is actually true for the RNDSCALEPH test added for the PR
here.
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