[Bug tree-optimization/115669] [12 Regression] rv64gcv/aarch64+sve -fwrapv miscompile since r15-1006-gd93353e6423

2025-01-10 Thread cvs-commit at gcc dot gnu.org via Gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115669

--- Comment #12 from GCC Commits  ---
The releases/gcc-12 branch has been updated by Richard Biener
:

https://gcc.gnu.org/g:882f7e53a7664f2c76b10dc020e720ba9f55f022

commit r12-10894-g882f7e53a7664f2c76b10dc020e720ba9f55f022
Author: Richard Biener 
Date:   Thu Jun 27 11:26:08 2024 +0200

tree-optimization/115669 - fix SLP reduction association

The following avoids associating a reduction path as that might
get STMT_VINFO_REDUC_IDX out-of-sync with the SLP operand order.
This is a latent issue with SLP reductions but now easily exposed
as we're doing single-lane SLP reductions.

When we achieved SLP only we can move and update this meta-data.

PR tree-optimization/115669
* tree-vect-slp.cc (vect_build_slp_tree_2): Do not reassociate
chains that participate in a reduction.

* gcc.dg/vect/pr115669.c: New testcase.

(cherry picked from commit 7886830bb45c4f5dca0496d4deae9a45204d78f5)

[Bug tree-optimization/115669] [12 Regression] rv64gcv/aarch64+sve -fwrapv miscompile since r15-1006-gd93353e6423

2025-01-10 Thread rguenth at gcc dot gnu.org via Gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115669

Richard Biener  changed:

   What|Removed |Added

  Known to work||12.4.1
 Status|ASSIGNED|RESOLVED
  Known to fail||12.4.0
 Resolution|--- |FIXED

--- Comment #13 from Richard Biener  ---
Fixed.