On Linux/x86_64,
79e29562907b454cdb867195b34cf63156d2d0cc is the first bad commit
commit 79e29562907b454cdb867195b34cf63156d2d0cc
Author: Avi Kivity <[email protected]>
Date: Thu Feb 26 19:59:41 2026 +0200
libstdc++: optimize std::uninitialized_move{,_n}() to memcpy when possible
[PR121789]
caused
FAIL: g++.dg/torture/pr118521.C -O1 (test for excess errors)
with GCC configured with
../../gcc/configure
--prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r17-570/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-torture.exp=g++.dg/torture/pr118521.C
--target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check
RUNTESTFLAGS="dg-torture.exp=g++.dg/torture/pr118521.C
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check
RUNTESTFLAGS="dg-torture.exp=g++.dg/torture/pr118521.C
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check
RUNTESTFLAGS="dg-torture.exp=g++.dg/torture/pr118521.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.)
