On Linux/x86_64,

4f9b1735ab5eaf93d07d65c81d83cd123a8f3478 is the first bad commit
commit 4f9b1735ab5eaf93d07d65c81d83cd123a8f3478
Author: Thomas Koenig <tkoe...@gcc.gnu.org>
Date:   Sat Oct 19 10:26:17 2024 +0200

    Fix an ICE with UNSIGNED in match_sym_complex_part.

caused

FAIL: gfortran.dg/unsigned_38.f90   -O  (test for excess errors)

with GCC configured with

../../gcc/configure 
--prefix=/export/users/haochenj/src/gcc-bisect/master/master/r15-4494/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.exp=gfortran.dg/unsigned_38.f90 --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="dg.exp=gfortran.dg/unsigned_38.f90 --target_board='unix{-m32\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="dg.exp=gfortran.dg/unsigned_38.f90 --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="dg.exp=gfortran.dg/unsigned_38.f90 --target_board='unix{-m64\ 
-march=cascadelake}'"

(Please do not reply to this email, for question about this report, contact me 
at haochen dot jiang at intel.com.)
(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.)

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