On Linux/x86_64,

54cdb2f5a5b01a482d7cbce30e7b738558eecf59 is the first bad commit
commit 54cdb2f5a5b01a482d7cbce30e7b738558eecf59
Author: liuhongt <hongtao....@intel.com>
Date:   Wed Jun 3 17:25:47 2020 +0800

    Optimize multiplication for V8QI,V16QI,V32QI under TARGET_AVX512BW.

caused

FAIL: gcc.target/i386/avx512bw-pr95488-1.c scan-assembler-times vpmovwb 2
FAIL: gcc.target/i386/avx512bw-pr95488-1.c scan-assembler-times vpmovzxbw 4
FAIL: gcc.target/i386/avx512bw-pr95488-1.c scan-assembler-times 
vpmullw[^\n]*zmm 2

with GCC configured with

../../gcc/configure 
--prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r11-1301/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/avx512bw-pr95488-1.c 
--target_board='unix{-m64\ -march=cascadelake}'"

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