On Linux/x86_64,
84e5bd1e7dbdd106956ed0f5d8ddee7bf7b3be7c is the first bad commit
commit 84e5bd1e7dbdd106956ed0f5d8ddee7bf7b3be7c
Author: Roger Sayle <[email protected]>
Date: Thu May 28 20:46:04 2026 +0100
x86 SSE: Improve vector increment/decrement on x86.
caused
FAIL: gcc.target/i386/sse2-paddb-2.c scan-assembler-times [ \t]paddb[ \t] 2
FAIL: gcc.target/i386/sse2-paddd-2.c scan-assembler-times [ \t]paddd[ \t] 2
FAIL: gcc.target/i386/sse2-paddw-2.c scan-assembler-times [ \t]paddw[ \t] 2
FAIL: gcc.target/i386/sse2-psubb-2.c scan-assembler-times [ \t]psubb[ \t] 2
FAIL: gcc.target/i386/sse2-psubd-2.c scan-assembler-times [ \t]psubd[ \t] 2
FAIL: gcc.target/i386/sse2-psubw-2.c scan-assembler-times [ \t]psubw[ \t] 2
with GCC configured with
../../gcc/configure
--prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r17-915/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="i386.exp=gcc.target/i386/sse2-paddb-2.c
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check
RUNTESTFLAGS="i386.exp=gcc.target/i386/sse2-paddb-2.c
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check
RUNTESTFLAGS="i386.exp=gcc.target/i386/sse2-paddd-2.c
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check
RUNTESTFLAGS="i386.exp=gcc.target/i386/sse2-paddd-2.c
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check
RUNTESTFLAGS="i386.exp=gcc.target/i386/sse2-paddw-2.c
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check
RUNTESTFLAGS="i386.exp=gcc.target/i386/sse2-paddw-2.c
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check
RUNTESTFLAGS="i386.exp=gcc.target/i386/sse2-psubb-2.c
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check
RUNTESTFLAGS="i386.exp=gcc.target/i386/sse2-psubb-2.c
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check
RUNTESTFLAGS="i386.exp=gcc.target/i386/sse2-psubd-2.c
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check
RUNTESTFLAGS="i386.exp=gcc.target/i386/sse2-psubd-2.c
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check
RUNTESTFLAGS="i386.exp=gcc.target/i386/sse2-psubw-2.c
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check
RUNTESTFLAGS="i386.exp=gcc.target/i386/sse2-psubw-2.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.)
