[Bug tree-optimization/115450] [15 Regression] cpu2017 502.gcc runtime miscompute on aarch64 with SVE since r15-1006-gd93353e6423eca

[liuhongt at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115450

Hongtao Liu  changed:

   What|Removed |Added

 CC||liuhongt at gcc dot gnu.org

--- Comment #5 from Hongtao Liu  ---
(In reply to Andrew Pinski from comment #1)
> >[r15-1006-gd93353e6423eca] Do single-lane SLP discovery for reductions
> 
> 
> Interesting because PR 115256 bisect it to an earlier patch.

For PR 115256, the issue is fixed after adding -fno-strict-aliasing.

[Bug tree-optimization/115450] [15 Regression] cpu2017 502.gcc runtime miscompute on aarch64 with SVE since r15-1006-gd93353e6423eca

[vineetg at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115450

--- Comment #4 from Vineet Gupta  ---
-Ofast -flto=auto -march=rv64gcv_zvl256b_zba_zbb_zbs_zicond_zfa
-ftree-vectorize -mrvv-vector-bits=zvl

For RISC-V issue only happens in a LTO build

[Bug tree-optimization/115450] [15 Regression] cpu2017 502.gcc runtime miscompute on aarch64 with SVE since r15-1006-gd93353e6423eca

[vineetg at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115450

Vineet Gupta  changed:

   What|Removed |Added

 CC||jeffreyalaw at gmail dot com,
   ||vineetg at gcc dot gnu.org

--- Comment #3 from Vineet Gupta  ---
Bisected RISC-V SPEC 502.gcc runtime failure to same commit as well.

[Bug tree-optimization/115450] [15 Regression] cpu2017 502.gcc runtime miscompute on aarch64 with SVE since r15-1006-gd93353e6423eca

[kugan at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115450

--- Comment #2 from kugan at gcc dot gnu.org ---
(In reply to Andrew Pinski from comment #1)
> >[r15-1006-gd93353e6423eca] Do single-lane SLP discovery for reductions
> 
> 
> Interesting because PR 115256 bisect it to an earlier patch.
I believe this is a new issue.

[Bug tree-optimization/115450] [15 Regression] cpu2017 502.gcc runtime miscompute on aarch64 with SVE since r15-1006-gd93353e6423eca

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115450

Andrew Pinski  changed:

   What|Removed |Added

 CC||pinskia at gcc dot gnu.org
 Target||aarch64-linux-gnu
   Keywords||wrong-code
Summary|cpu2017 502.gcc runtime |[15 Regression] cpu2017
   |miscompute  |502.gcc runtime miscompute
   ||on aarch64 with SVE since
   ||r15-1006-gd93353e6423eca
   Target Milestone|--- |15.0
 Blocks||26163


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=26163
[Bug 26163] [meta-bug] missed optimization in SPEC (2k17, 2k and 2k6 and 95)