On Linux/x86_64,
523b01b022f74f73f0e20a40950536c06f538910 is the first bad commit
commit 523b01b022f74f73f0e20a40950536c06f538910
Author: Richard Biener <[email protected]>
Date: Thu Jan 22 14:06:50 2026 +0100
Avoid selecting masked epilogs for in-order reduction vectorization
caused
FAIL: gcc.dg/vect/costmodel/x86_64/costmodel-vect-epil-1.c scan-tree-dump vect
"optimized: epilogue loop vectorized using 32 byte vectors"
FAIL: gcc.dg/vect/costmodel/x86_64/costmodel-vect-epil-1.c scan-tree-dump vect
"optimized: loop vectorized using 64 byte vectors"
with GCC configured with
../../gcc/configure
--prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r16-6988/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="x86_64-costmodel-vect.exp=gcc.dg/vect/costmodel/x86_64/costmodel-vect-epil-1.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.)
