On Linux/x86_64,

586477d67bf2e320e8ec41f82b194259c1dcc43a is the first bad commit
commit 586477d67bf2e320e8ec41f82b194259c1dcc43a
Author: Andre Vehreschild <ve...@gcc.gnu.org>
Date:   Fri Dec 6 08:57:34 2024 +0100

    Fortran: Replace getting of coarray data with accessor-based version. 
[PR107635]

caused

FAIL: gfortran.dg/coarray_lib_comm_1.f90   -O0   scan-tree-dump-times original 
"_gfortran_caf_get_by_ct \\(caf_token.., 0B, 0B, 1, \\(unsigned long\\) 
atmp.[0-9]+.span" 4
FAIL: gfortran.dg/coarray_lib_comm_1.f90   -O1   scan-tree-dump-times original 
"_gfortran_caf_get_by_ct \\(caf_token.., 0B, 0B, 1, \\(unsigned long\\) 
atmp.[0-9]+.span" 4
FAIL: gfortran.dg/coarray_lib_comm_1.f90   -O2   scan-tree-dump-times original 
"_gfortran_caf_get_by_ct \\(caf_token.., 0B, 0B, 1, \\(unsigned long\\) 
atmp.[0-9]+.span" 4
FAIL: gfortran.dg/coarray_lib_comm_1.f90   -O3 -fomit-frame-pointer 
-funroll-loops -fpeel-loops -ftracer -finline-functions   scan-tree-dump-times 
original "_gfortran_caf_get_by_ct \\(caf_token.., 0B, 0B, 1, \\(unsigned 
long\\) atmp.[0-9]+.span" 4
FAIL: gfortran.dg/coarray_lib_comm_1.f90   -O3 -g   scan-tree-dump-times 
original "_gfortran_caf_get_by_ct \\(caf_token.., 0B, 0B, 1, \\(unsigned 
long\\) atmp.[0-9]+.span" 4
FAIL: gfortran.dg/coarray_lib_comm_1.f90   -Os   scan-tree-dump-times original 
"_gfortran_caf_get_by_ct \\(caf_token.., 0B, 0B, 1, \\(unsigned long\\) 
atmp.[0-9]+.span" 4

with GCC configured with

../../gcc/configure 
--prefix=/export/users/haochenj/src/gcc-bisect/master/master/r15-6415/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/coarray_lib_comm_1.f90 
--target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="dg.exp=gfortran.dg/coarray_lib_comm_1.f90 
--target_board='unix{-m32\ -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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