* [Bug target/95082] LE implementations of vec_cnttz_lsbb and vec_cntlz_lsbb are wrong
2020-05-12 13:34 [Bug target/95082] New: LE implementations of vec_cnttz_lsbb and vec_cntlz_lsbb are wrong wschmidt at gcc dot gnu.org
@ 2020-05-12 13:34 ` wschmidt at gcc dot gnu.org
2020-05-15 0:53 ` pc at us dot ibm.com
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From: wschmidt at gcc dot gnu.org @ 2020-05-12 13:34 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95082
Bill Schmidt <wschmidt at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Status|UNCONFIRMED |NEW
Last reconfirmed| |2020-05-12
Ever confirmed|0 |1
Target Milestone|--- |11.0
CC| |segher at gcc dot gnu.org
--- Comment #1 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Confirmed.
^ permalink raw reply [flat|nested] 12+ messages in thread* [Bug target/95082] LE implementations of vec_cnttz_lsbb and vec_cntlz_lsbb are wrong
2020-05-12 13:34 [Bug target/95082] New: LE implementations of vec_cnttz_lsbb and vec_cntlz_lsbb are wrong wschmidt at gcc dot gnu.org
2020-05-12 13:34 ` [Bug target/95082] " wschmidt at gcc dot gnu.org
@ 2020-05-15 0:53 ` pc at us dot ibm.com
2020-05-15 10:50 ` segher at gcc dot gnu.org
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From: pc at us dot ibm.com @ 2020-05-15 0:53 UTC (permalink / raw)
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Paul Clarke <pc at us dot ibm.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |pc at us dot ibm.com
--- Comment #2 from Paul Clarke <pc at us dot ibm.com> ---
This is a dup of bug 95070.
(I am unable to mark it as such.)
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2020-05-12 13:34 [Bug target/95082] New: LE implementations of vec_cnttz_lsbb and vec_cntlz_lsbb are wrong wschmidt at gcc dot gnu.org
2020-05-12 13:34 ` [Bug target/95082] " wschmidt at gcc dot gnu.org
2020-05-15 0:53 ` pc at us dot ibm.com
@ 2020-05-15 10:50 ` segher at gcc dot gnu.org
2020-05-15 10:51 ` segher at gcc dot gnu.org
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--- Comment #3 from Segher Boessenkool <segher at gcc dot gnu.org> ---
*** Bug 95070 has been marked as a duplicate of this bug. ***
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2020-05-12 13:34 [Bug target/95082] New: LE implementations of vec_cnttz_lsbb and vec_cntlz_lsbb are wrong wschmidt at gcc dot gnu.org
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--- Comment #4 from Segher Boessenkool <segher at gcc dot gnu.org> ---
But this PR has more info, so I'll close the older one as dup, instead.
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2020-05-12 13:34 [Bug target/95082] New: LE implementations of vec_cnttz_lsbb and vec_cntlz_lsbb are wrong wschmidt at gcc dot gnu.org
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From: jakub at gcc dot gnu.org @ 2021-04-27 11:38 UTC (permalink / raw)
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|11.0 |11.2
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 11.1 has been released, retargeting bugs to GCC 11.2.
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2020-05-12 13:34 [Bug target/95082] New: LE implementations of vec_cnttz_lsbb and vec_cntlz_lsbb are wrong wschmidt at gcc dot gnu.org
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From: rguenth at gcc dot gnu.org @ 2021-07-28 7:04 UTC (permalink / raw)
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|11.2 |---
^ permalink raw reply [flat|nested] 12+ messages in thread* [Bug target/95082] LE implementations of vec_cnttz_lsbb and vec_cntlz_lsbb are wrong
2020-05-12 13:34 [Bug target/95082] New: LE implementations of vec_cnttz_lsbb and vec_cntlz_lsbb are wrong wschmidt at gcc dot gnu.org
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From: wschmidt at gcc dot gnu.org @ 2022-01-18 15:15 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #6 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
*** Bug 103981 has been marked as a duplicate of this bug. ***
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2020-05-12 13:34 [Bug target/95082] New: LE implementations of vec_cnttz_lsbb and vec_cntlz_lsbb are wrong wschmidt at gcc dot gnu.org
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2022-02-11 13:59 ` [Bug target/95082] [11] " wschmidt at gcc dot gnu.org
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--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by William Schmidt <wschmidt@gcc.gnu.org>:
https://gcc.gnu.org/g:3f30f2d1dbb3228b8468b26239fe60c2974ce2ac
commit r12-7029-g3f30f2d1dbb3228b8468b26239fe60c2974ce2ac
Author: Bill Schmidt <wschmidt@linux.ibm.com>
Date: Wed Feb 2 21:24:22 2022 -0600
rs6000: Fix LE code gen for vec_cnt[lt]z_lsbb [PR95082]
These built-ins were misimplemented as always having big-endian semantics.
2022-01-18 Bill Schmidt <wschmidt@linux.ibm.com>
gcc/
PR target/95082
* config/rs6000/rs6000-builtin.cc (rs6000_expand_builtin): Handle
endianness for vclzlsbb and vctzlsbb.
* config/rs6000/rs6000-builtins.def (VCLZLSBB_V16QI): Change
default pattern and indicate a different pattern will be used for
big endian.
(VCLZLSBB_V4SI): Likewise.
(VCLZLSBB_V8HI): Likewise.
(VCTZLSBB_V16QI): Likewise.
(VCTZLSBB_V4SI): Likewise.
(VCTZLSBB_V8HI): Likewise.
gcc/testsuite/
PR target/95082
* gcc.target/powerpc/vsu/vec-cntlz-lsbb-0.c: Restrict to -mbig.
* gcc.target/powerpc/vsu/vec-cntlz-lsbb-1.c: Likewise.
* gcc.target/powerpc/vsu/vec-cntlz-lsbb-3.c: New.
* gcc.target/powerpc/vsu/vec-cntlz-lsbb-4.c: New.
* gcc.target/powerpc/vsu/vec-cnttz-lsbb-0.c: Restrict to -mbig.
* gcc.target/powerpc/vsu/vec-cnttz-lsbb-1.c: Likewise.
* gcc.target/powerpc/vsu/vec-cnttz-lsbb-3.c: New.
* gcc.target/powerpc/vsu/vec-cnttz-lsbb-4.c: New.
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2020-05-12 13:34 [Bug target/95082] New: LE implementations of vec_cnttz_lsbb and vec_cntlz_lsbb are wrong wschmidt at gcc dot gnu.org
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@ 2022-02-11 13:59 ` wschmidt at gcc dot gnu.org
2022-02-11 15:15 ` segher at gcc dot gnu.org
2022-02-23 20:25 ` [Bug target/95082] " wschmidt at gcc dot gnu.org
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From: wschmidt at gcc dot gnu.org @ 2022-02-11 13:59 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95082
Bill Schmidt <wschmidt at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |12.0
Summary|[11/12] LE implementations |[11] LE implementations of
|of vec_cnttz_lsbb and |vec_cnttz_lsbb and
|vec_cntlz_lsbb are wrong |vec_cntlz_lsbb are wrong
Known to fail| |11.0
--- Comment #8 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
This still needs a backport to 11, but I won't be able to work on that.
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2020-05-12 13:34 [Bug target/95082] New: LE implementations of vec_cnttz_lsbb and vec_cntlz_lsbb are wrong wschmidt at gcc dot gnu.org
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2022-02-11 13:59 ` [Bug target/95082] [11] " wschmidt at gcc dot gnu.org
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--- Comment #9 from Segher Boessenkool <segher at gcc dot gnu.org> ---
It still needs fixing on trunk as well, as discussed.
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2020-05-12 13:34 [Bug target/95082] New: LE implementations of vec_cnttz_lsbb and vec_cntlz_lsbb are wrong wschmidt at gcc dot gnu.org
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From: wschmidt at gcc dot gnu.org @ 2022-02-23 20:25 UTC (permalink / raw)
To: gcc-bugs
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Bill Schmidt <wschmidt at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to fail|11.0 |
Summary|[11] LE implementations of |LE implementations of
|vec_cnttz_lsbb and |vec_cnttz_lsbb and
|vec_cntlz_lsbb are wrong |vec_cntlz_lsbb are wrong
--- Comment #10 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
>From some private discussion today, this goes back quite some ways, and we're
simply going to document this as a change in behavior. The old behavior was
wrong and usage of these built-ins is not very prevalent. We'll make a point
of this change in the release notes, rather than do any backports.
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