On Linux/x86_64,
9f8409f2e2c28f64bf6a584bc81afcae0f084785 is the first bad commit
commit 9f8409f2e2c28f64bf6a584bc81afcae0f084785
Author: Zhongyao Chen <[email protected]>
Date: Wed Jun 3 20:44:59 2026 +0800
vect: Avoid external fallback while operand swap retry is possible
caused
FAIL: g++.dg/vect/slp-pr98855.cc -std=c++26 scan-tree-dump-not slp1
"vectorizing stmts using SLP"
FAIL: g++.dg/vect/slp-pr98855.cc -std=c++26 scan-tree-dump slp1 "not
vectorized: vectorization is not profitable"
with GCC configured with
../../gcc/configure
--prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r17-1485/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="vect.exp=g++.dg/vect/slp-pr98855.cc --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.)
