On Linux/x86_64,

90dde804626f1344f0d63827709406b135433272 is the first bad commit
commit 90dde804626f1344f0d63827709406b135433272
Author: Giuseppe D'Angelo <[email protected]>
Date:   Mon Dec 9 01:32:27 2024 +0100

    libstdc++: Handle cv-qualified types in atomic and atomic_ref [PR115402]

caused

FAIL: 29_atomics/atomic_ref/float.cc  -std=gnu++20 execution test
FAIL: 29_atomics/atomic_ref/float.cc  -std=gnu++26 execution test

with GCC configured with

../../gcc/configure 
--prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r16-4349/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}/x86_64-linux/libstdc++-v3/testsuite && make check 
RUNTESTFLAGS="conformance.exp=29_atomics/atomic_ref/float.cc 
--target_board='unix{-m32}'"
$ cd {build_dir}/x86_64-linux/libstdc++-v3/testsuite && make check 
RUNTESTFLAGS="conformance.exp=29_atomics/atomic_ref/float.cc 
--target_board='unix{-m32\ -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.)

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