[r16-7431 Regression] FAIL: gcc.dg/guality/pr54693-2.c -O3 -fomit-frame-pointer -funroll-loops -fpeel-loops -ftracer -finline-functions -DPREVENT_OPTIMIZATION line 21 x == 10 - i on Linux/x86_64

[Haochen Jiang]

On Linux/x86_64,

e55de74d50d236db0472431fe242f3244e41b884 is the first bad commit
commit e55de74d50d236db0472431fe242f3244e41b884
Author: Richard Biener <rguenther@suse.de>
Date:   Tue Feb 10 09:46:08 2026 +0100

    tree-optimization/107690 - avoid creating un-analyzable loop exits

caused

FAIL: gcc.dg/guality/pr54693-2.c   -O2  -DPREVENT_OPTIMIZATION  line 21 x == 10 - i
FAIL: gcc.dg/guality/pr54693-2.c   -O2 -flto -fno-use-linker-plugin -flto-partition=none  -DPREVENT_OPTIMIZATION line 21 x == 10 - i
FAIL: gcc.dg/guality/pr54693-2.c   -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects  -DPREVENT_OPTIMIZATION line 21 x == 10 - i
FAIL: gcc.dg/guality/pr54693-2.c   -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects  -DPREVENT_OPTIMIZATION line 21 y == 20 - 2 * i
FAIL: gcc.dg/guality/pr54693-2.c   -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects  -DPREVENT_OPTIMIZATION line 21 z == 30 - 3 * i
FAIL: gcc.dg/guality/pr54693-2.c   -O3 -fomit-frame-pointer -funroll-loops -fpeel-loops -ftracer -finline-functions  -DPREVENT_OPTIMIZATION  line 21 x == 10 - i
FAIL: gcc.dg/guality/pr54693-2.c   -O3 -g  -DPREVENT_OPTIMIZATION  line 21 x == 10 - i

with GCC configured with

../../gcc/configure --prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r16-7431/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="guality.exp=gcc.dg/guality/pr54693-2.c --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="guality.exp=gcc.dg/guality/pr54693-2.c --target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="guality.exp=gcc.dg/guality/pr54693-2.c --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="guality.exp=gcc.dg/guality/pr54693-2.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.)