On Linux/x86_64,

93ac832f1846e4867aa6537f76f510fab8e3e87d is the first bad commit
commit 93ac832f1846e4867aa6537f76f510fab8e3e87d
Author: Andrew MacLeod <amacl...@redhat.com>
Date:   Thu Oct 7 10:12:29 2021 -0400

    Ranger : Do not process abnormal ssa-names.

caused

FAIL: 27_io/ios_base/failure/dual_abi.cc execution test

with GCC configured with

../../gcc/configure 
--prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r12-4443/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=27_io/ios_base/failure/dual_abi.cc 
--target_board='unix{-m32}'"
$ cd {build_dir}/x86_64-linux/libstdc++-v3/testsuite && make check 
RUNTESTFLAGS="conformance.exp=27_io/ios_base/failure/dual_abi.cc 
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/x86_64-linux/libstdc++-v3/testsuite && make check 
RUNTESTFLAGS="conformance.exp=27_io/ios_base/failure/dual_abi.cc 
--target_board='unix{-m64}'"
$ cd {build_dir}/x86_64-linux/libstdc++-v3/testsuite && make check 
RUNTESTFLAGS="conformance.exp=27_io/ios_base/failure/dual_abi.cc 
--target_board='unix{-m64\ -march=cascadelake}'"

(Please do not reply to this email, for question about this report, contact me 
at skpgkp2 at gmail dot com)

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