https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117012
--- Comment #1 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
bisect landed on
g:aac00d09859cc5934bd0f7493d537b8430337773 is the first bad commit
commit aac00d09859cc5934bd0f7493d537b8430337773
Author: liuhongt <hongtao....@intel.com>
Date: Thu Jun 20 12:41:13 2024 +0800
Optimize a < 0 ? -1 : 0 to (signed)a >> 31.
Try to optimize x < 0 ? -1 : 0 into (signed) x >> 31
and x < 0 ? 1 : 0 into (unsigned) x >> 31.
Move the optimization did in ix86_expand_int_vcond to match.pd
gcc/ChangeLog:
PR target/114189
* match.pd: Simplify a < 0 ? -1 : 0 to (signed) >> 31 and a <
0 ? 1 : 0 to (unsigned) a >> 31 for vector integer type.
gcc/testsuite/ChangeLog:
* gcc.target/i386/avx2-pr115517.c: New test.
* gcc.target/i386/avx512-pr115517.c: New test.
* g++.target/i386/avx2-pr115517.C: New test.
* g++.target/i386/avx512-pr115517.C: New test.
* g++.dg/tree-ssa/pr88152-1.C: Adjust testcase.
gcc/match.pd | 30 +++++++++++
gcc/testsuite/g++.dg/tree-ssa/pr88152-1.C | 2 +-
gcc/testsuite/g++.target/i386/avx2-pr115517.C | 60 +++++++++++++++++++++
gcc/testsuite/g++.target/i386/avx512-pr115517.C | 70 +++++++++++++++++++++++++
gcc/testsuite/gcc.target/i386/avx2-pr115517.c | 33 ++++++++++++
gcc/testsuite/gcc.target/i386/avx512-pr115517.c | 70 +++++++++++++++++++++++++
6 files changed, 264 insertions(+), 1 deletion(-)
create mode 100644 gcc/testsuite/g++.target/i386/avx2-pr115517.C
create mode 100644 gcc/testsuite/g++.target/i386/avx512-pr115517.C
create mode 100644 gcc/testsuite/gcc.target/i386/avx2-pr115517.c
create mode 100644 gcc/testsuite/gcc.target/i386/avx512-pr115517.c
but I guess that's just exposing the issue.
