[r17-2335 Regression] FAIL: gcc.target/i386/bmi2-mulx-highpart-1.c check-function-bodies div7 on Linux/x86_64

Haochen Jiang via Gcc-regression <[email protected]> Mon, 13 Jul 2026 17:24:45 +0800

Newsgroups	gmane.comp.gcc.regression,gmane.comp.gcc.patches
Message-ID	<[email protected]>

On Linux/x86_64,

3cca524e337a886d479e630c7a3e6aef4656b425 is the first bad commit
commit 3cca524e337a886d479e630c7a3e6aef4656b425
Author: MITSUNARI Shigeo <[email protected]>
Date:   Sat Jul 11 22:38:41 2026 -0600

    i386: Add BMI2 MULX pattern for highpart-only multiplication

caused

FAIL: gcc.target/i386/bmi2-mulx-highpart-1.c check-function-bodies div7

with GCC configured with

../../gcc/configure --prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r17-2335/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/bmi2-mulx-highpart-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.)