On Linux/x86_64,

1644ab9917ca6b96e9e683c422f1793258b9a3db is the first bad commit
commit 1644ab9917ca6b96e9e683c422f1793258b9a3db
Author: Tobias Burnus <tob...@codesourcery.com>
Date:   Wed Nov 11 09:23:07 2020 +0100

    gfortran.dg/gomp/workshare-reduction-*.f90: Fix dumps for -m32

caused

FAIL: gfortran.dg/gomp/workshare-reduction-26.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_maybe_nonmonotonic_runtime_next " 1
FAIL: gfortran.dg/gomp/workshare-reduction-26.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_start [^\n\r]*, 0, 0, " 1
FAIL: gfortran.dg/gomp/workshare-reduction-27.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_runtime_next " 1
FAIL: gfortran.dg/gomp/workshare-reduction-27.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_start [^\n\r]*, 
(?:2147483648|-2147483648), 0, " 1
FAIL: gfortran.dg/gomp/workshare-reduction-28.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_nonmonotonic_runtime_next " 1
FAIL: gfortran.dg/gomp/workshare-reduction-28.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_start [^\n\r]*, 4, 0, " 1
FAIL: gfortran.dg/gomp/workshare-reduction-36.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_nonmonotonic_dynamic_next " 1
FAIL: gfortran.dg/gomp/workshare-reduction-36.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_start [^\n\r]*, 2, 1, " 1
FAIL: gfortran.dg/gomp/workshare-reduction-37.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_dynamic_next " 1
FAIL: gfortran.dg/gomp/workshare-reduction-37.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_start [^\n\r]*, 
(?:2147483650|-2147483646), 1, " 1
FAIL: gfortran.dg/gomp/workshare-reduction-38.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_nonmonotonic_dynamic_next " 1
FAIL: gfortran.dg/gomp/workshare-reduction-38.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_start [^\n\r]*, 2, 1, " 1
FAIL: gfortran.dg/gomp/workshare-reduction-39.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_nonmonotonic_dynamic_next " 1
FAIL: gfortran.dg/gomp/workshare-reduction-39.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_start [^\n\r]*, 2, 3, " 1
FAIL: gfortran.dg/gomp/workshare-reduction-3.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_nonmonotonic_runtime_next " 1
FAIL: gfortran.dg/gomp/workshare-reduction-3.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_start [^\n\r]*, 4, 0, " 1
FAIL: gfortran.dg/gomp/workshare-reduction-40.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_dynamic_next " 1
FAIL: gfortran.dg/gomp/workshare-reduction-40.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_start [^\n\r]*, 
(?:2147483650|-2147483646), 3, " 1
FAIL: gfortran.dg/gomp/workshare-reduction-41.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_nonmonotonic_dynamic_next " 1
FAIL: gfortran.dg/gomp/workshare-reduction-41.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_start [^\n\r]*, 2, 3, " 1
FAIL: gfortran.dg/gomp/workshare-reduction-42.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_nonmonotonic_guided_next " 1
FAIL: gfortran.dg/gomp/workshare-reduction-42.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_start [^\n\r]*, 3, 1, " 1
FAIL: gfortran.dg/gomp/workshare-reduction-43.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_guided_next " 1
FAIL: gfortran.dg/gomp/workshare-reduction-43.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_start [^\n\r]*, 
(?:2147483651|-2147483645), 1, " 1
FAIL: gfortran.dg/gomp/workshare-reduction-44.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_nonmonotonic_guided_next " 1
FAIL: gfortran.dg/gomp/workshare-reduction-44.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_start [^\n\r]*, 3, 1, " 1
FAIL: gfortran.dg/gomp/workshare-reduction-45.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_nonmonotonic_guided_next " 1
FAIL: gfortran.dg/gomp/workshare-reduction-45.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_start [^\n\r]*, 3, 3, " 1
FAIL: gfortran.dg/gomp/workshare-reduction-46.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_guided_next " 1
FAIL: gfortran.dg/gomp/workshare-reduction-46.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_start [^\n\r]*, 
(?:2147483651|-2147483645), 3, " 1
FAIL: gfortran.dg/gomp/workshare-reduction-47.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_nonmonotonic_guided_next " 1
FAIL: gfortran.dg/gomp/workshare-reduction-47.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_start [^\n\r]*, 3, 3, " 1
FAIL: gfortran.dg/gomp/workshare-reduction-56.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_doacross(?:_ull)_post " 1
FAIL: gfortran.dg/gomp/workshare-reduction-56.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_doacross(?:_ull)_wait " 1
FAIL: gfortran.dg/gomp/workshare-reduction-56.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_doacross_start [^\n\r]*, 
(?:2147483649|-2147483647), 0, " 1
FAIL: gfortran.dg/gomp/workshare-reduction-56.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_static_next " 1
FAIL: gfortran.dg/gomp/workshare-reduction-57.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_doacross(?:_ull)_post " 1
FAIL: gfortran.dg/gomp/workshare-reduction-57.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_doacross(?:_ull)_wait " 1
FAIL: gfortran.dg/gomp/workshare-reduction-57.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_doacross_start [^\n\r]*, 
(?:2147483650|-2147483646), 1, " 1
FAIL: gfortran.dg/gomp/workshare-reduction-57.f90   -O   scan-tree-dump-times 
optimized "__builtin_GOMP_loop(?:_ull)_dynamic_next " 1

with GCC configured with

../../gcc/configure 
--prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r11-4903/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="gomp.exp=gfortran.dg/gomp/workshare-reduction-26.f90 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-26.f90 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-27.f90 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-27.f90 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-28.f90 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-28.f90 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-36.f90 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-36.f90 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-37.f90 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-37.f90 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-38.f90 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-38.f90 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-39.f90 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-39.f90 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-3.f90 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-3.f90 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-40.f90 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-40.f90 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-41.f90 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-41.f90 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-42.f90 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-42.f90 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-43.f90 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-43.f90 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-44.f90 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-44.f90 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-45.f90 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-45.f90 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-46.f90 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-46.f90 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-47.f90 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-47.f90 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-56.f90 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-56.f90 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-57.f90 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/workshare-reduction-57.f90 
--target_board='unix{-m64\ -march=cascadelake}'"

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