https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121503
--- Comment #2 from Kishan Parmar <kishan at gcc dot gnu.org> ---
Looks like, since all failure i am observing are on combine pass.
/home/kishan/CI/build/gcc/xgcc -B/home/kishan/CI/build/gcc/
/home/kishan/CI/gcc/gcc/testsuite/gcc.c-torture/execute/pr77718.c
-fdiagnostics-plain-output -O2 -w -lm -o ./pr77718.exe^M
during RTL pass: combine^M
/home/kishan/CI/gcc/gcc/testsuite/gcc.c-torture/execute/pr77718.c: In function
'foo':^M
/home/kishan/CI/gcc/gcc/testsuite/gcc.c-torture/execute/pr77718.c:9:1: internal
compiler error: in gen_rtx_SUBREG, at emit-rtl.cc:1048^M
0x121fc7af internal_error(char const*, ...)^M
/home/kishan/CI/build/../gcc/gcc/diagnostic-global-context.cc:534^M
0x102cd533 fancy_abort(char const*, int, char const*)^M
/home/kishan/CI/build/../gcc/gcc/diagnostics/context.cc:1640^M
0x106e8b33 gen_rtx_SUBREG(machine_mode, rtx_def*, poly_int<1u, unsigned
long>)^M
/home/kishan/CI/build/../gcc/gcc/emit-rtl.cc:1048^M
0x106e8b33 gen_rtx_SUBREG(machine_mode, rtx_def*, poly_int<1u, unsigned
long>)^M
/home/kishan/CI/build/../gcc/gcc/emit-rtl.cc:1046^M
0x11e44987 simplify_gen_subreg(machine_mode, rtx_def*, machine_mode,
poly_int<1u, unsigned long>)^M
/home/kishan/CI/build/../gcc/gcc/rtl.h:3618^M
0x11e44987 if_then_else_cond^M
/home/kishan/CI/build/../gcc/gcc/combine.cc:9487^M
0x11e44a4b if_then_else_cond^M
/home/kishan/CI/build/../gcc/gcc/combine.cc:9352^M
0x11e56c23 combine_simplify_rtx^M
/home/kishan/CI/build/../gcc/gcc/combine.cc:5824^M
0x11e5a3cb subst^M
/home/kishan/CI/build/../gcc/gcc/combine.cc:5660^M
0x11e59cff subst^M
/home/kishan/CI/build/../gcc/gcc/combine.cc:5587^M
0x11e59cff subst^M
/home/kishan/CI/build/../gcc/gcc/combine.cc:5587^M
0x11e5ea4b try_combine^M
/home/kishan/CI/build/../gcc/gcc/combine.cc:3357^M
0x11e65817 combine_instructions^M
/home/kishan/CI/build/../gcc/gcc/combine.cc:1293^M
0x11e65817 rest_of_handle_combine^M
/home/kishan/CI/build/../gcc/gcc/combine.cc:15231^M
0x11e65817 execute^M
/home/kishan/CI/build/../gcc/gcc/combine.cc:15275^M
