On Linux/x86_64,
a4844311b2f48436998f02c8a1c224086426a0cc is the first bad commit
commit a4844311b2f48436998f02c8a1c224086426a0cc
Author: Jakub Jelinek <[email protected]>
Date: Tue Oct 20 12:05:03 2026 +0200
bitintlower: Fix up the single use SSA_NAME optimization [PR127905]
caused
FAIL: gcc.dg/torture/bitint-112.c -O0 (test for excess errors)
FAIL: gcc.dg/torture/bitint-112.c -O1 (test for excess errors)
FAIL: gcc.dg/torture/bitint-112.c -O2 -flto -fno-use-linker-plugin
-flto-partition=none (test for excess errors)
FAIL: gcc.dg/torture/bitint-112.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects (test for excess errors)
FAIL: gcc.dg/torture/bitint-112.c -O2 (test for excess errors)
FAIL: gcc.dg/torture/bitint-112.c -O3 -fomit-frame-pointer -funroll-loops
-fpeel-loops -ftracer -finline-functions (test for excess errors)
FAIL: gcc.dg/torture/bitint-112.c -O3 -g (test for excess errors)
FAIL: gcc.dg/torture/bitint-112.c -Os (test for excess errors)
with GCC configured with
../../gcc/configure
--prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r17-5400/usr
--enable-clocale=gnu --with-system-zlib --with-demangler-in-ld
--with-fpmath=sse --enable-languages=c,c++,fortran --enable-cet --without-isl
--enable-libmpx x86_64-linux --disable-bootstrap
To reproduce:
$ cd {build_dir}/gcc && make check
RUNTESTFLAGS="dg-torture.exp=gcc.dg/torture/bitint-112.c
--target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check
RUNTESTFLAGS="dg-torture.exp=gcc.dg/torture/bitint-112.c
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check
RUNTESTFLAGS="dg-torture.exp=gcc.dg/torture/bitint-112.c
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check
RUNTESTFLAGS="dg-torture.exp=gcc.dg/torture/bitint-112.c
--target_board='unix{-m64\ -march=cascadelake}'"
(Please directly reply to this email for question about this report.)
(If you met problems with cascadelake related, disabling AVX512F in command
line might save that.)
(However, please make sure that there is no potential problems with AVX512.)
