On Linux/x86_64,

e740f3d73144abbca1ad98a04825c6bd63314a0b is the first bad commit
commit e740f3d73144abbca1ad98a04825c6bd63314a0b
Author: liuhongt <hongtao....@intel.com>
Date:   Wed May 20 15:53:14 2020 +0800

    Add missing vector truncmn2 expanders [PR92658]

caused

FAIL: gcc.target/i386/pr92645-4.c scan-tree-dump-times optimized 
"BIT_FIELD_REF" 2
FAIL: gcc.target/i386/pr92645-4.c scan-tree-dump-times optimized 
"VEC_PACK_TRUNC" 1

with GCC configured with

../../gcc/configure 
--prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r11-571/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/pr92645-4.c --target_board='unix{-m64\ 
-march=cascadelake}'"

(Please do not reply to this email, for question about this report, contact me 
at skpgkp2 at gmail dot com)

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