https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111334
--- Comment #1 from chenglulu <chenglulu at loongson dot cn> ---
$ gcc test.c -o - -S -O1
test.c: 在函数‘add_startpgm’中:
test.c:33:1: 编译器内部错误：在 simplify_subreg 中，于 simplify-rtx.cc:7538
33 | }
| ^
0x13506f4 simplify_context::simplify_subreg(machine_mode, rtx_def*,
machine_mode, poly_int<1u, unsigned long>)
/home/chenglulu/work/loongisa-toolchain/gcc-upstream/gcc/simplify-rtx.cc:7537
0x1351ea3 simplify_context::simplify_subreg(machine_mode, rtx_def*,
machine_mode, poly_int<1u, unsigned long>)
/home/chenglulu/work/loongisa-toolchain/gcc-upstream/gcc/simplify-rtx.cc:7787
0x135264c simplify_context::simplify_gen_subreg(machine_mode, rtx_def*,
machine_mode, poly_int<1u, unsigned long>)
/home/chenglulu/work/loongisa-toolchain/gcc-upstream/gcc/simplify-rtx.cc:7858
0xd1684f simplify_gen_subreg(machine_mode, rtx_def*, machine_mode, poly_int<1u,
unsigned long>)
/home/chenglulu/work/loongisa-toolchain/gcc-upstream/gcc/rtl.h:3549
0x1e4aa06 if_then_else_cond
/home/chenglulu/work/loongisa-toolchain/gcc-upstream/gcc/combine.cc:9400
0x1e4a21e if_then_else_cond
/home/chenglulu/work/loongisa-toolchain/gcc-upstream/gcc/combine.cc:9265
0x1e3ddb8 combine_simplify_rtx
/home/chenglulu/work/loongisa-toolchain/gcc-upstream/gcc/combine.cc:5748
0x1e3d79a subst
/home/chenglulu/work/loongisa-toolchain/gcc-upstream/gcc/combine.cc:5609
0x1e3df1f combine_simplify_rtx
/home/chenglulu/work/loongisa-toolchain/gcc-upstream/gcc/combine.cc:5769
0x1e3d79a subst
/home/chenglulu/work/loongisa-toolchain/gcc-upstream/gcc/combine.cc:5609
0x1e3d50d subst
/home/chenglulu/work/loongisa-toolchain/gcc-upstream/gcc/combine.cc:5536
0x1e35f40 try_combine
/home/chenglulu/work/loongisa-toolchain/gcc-upstream/gcc/combine.cc:3339
0x1e305a0 combine_instructions
/home/chenglulu/work/loongisa-toolchain/gcc-upstream/gcc/combine.cc:1285
0x1e5addb rest_of_handle_combine
/home/chenglulu/work/loongisa-toolchain/gcc-upstream/gcc/combine.cc:15063
0x1e5ae98 execute
/home/chenglulu/work/loongisa-toolchain/gcc-upstream/gcc/combine.cc:15107
