On Linux/x86_64,

5af1e827bbb624eb28f80d2c5e0da46185af3708 is the first bad commit
commit 5af1e827bbb624eb28f80d2c5e0da46185af3708
Author: Richard Biener <rguent...@suse.de>
Date:   Tue Oct 27 11:03:27 2020 +0100

    Avoid uniform lane BB vectorization

caused

FAIL: gfortran.dg/vect/pr83232.f90   -O   scan-tree-dump-times slp1 
"vectorizing stmts using SLP" 3

with GCC configured with

../../gcc/configure 
--prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r11-4427/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="vect.exp=gfortran.dg/vect/pr83232.f90 --target_board='unix{-m32\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="vect.exp=gfortran.dg/vect/pr83232.f90 --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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