https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122735
Bug ID: 122735
Summary: RISCV: ICE during RTL pass: combine
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: ybni at cse dot cuhk.edu.hk
Target Milestone: ---
This code triggered ICE with `-O1 -x c -march=rv64gcv -mabi=lp64d`:
```C
int a;
void b() {
int c;
unsigned d = c + 19;
a = d >> 32 + 19 + d + 255 - 293;
}
```
Crash:
```sh
during RTL pass: combine
<source>: In function 'b':
<source>:6:1: internal compiler error: in simplify_subreg, at
simplify-rtx.cc:8209
6 | }
| ^
0x740b75629e3f __libc_start_main
???:0
```
Compiler Explorer: https://godbolt.org/z/8saTn97bv
Compiler version:
```sh
$ riscv64-unknown-linux-musl-gcc -v
Using built-in specs.
COLLECT_GCC=riscv64-unknown-linux-musl-gcc
COLLECT_LTO_WRAPPER=/data/yunboni/utils/compilers/riscv64-unknown-linux-musl/libexec/gcc/riscv64-unknown-linux-musl/16.0.0/lto-wrapper
Target: riscv64-unknown-linux-musl
Configured with:
/data/yunboni/utils/compilers/cross-riscv/.build/riscv64-unknown-linux-musl/src/gcc/configure
--build=x86_64-build_pc-linux-gnu --host=x86_64-build_pc-linux-gnu
--target=riscv64-unknown-linux-musl
--prefix=/data/yunboni/utils/compilers/riscv64-unknown-linux-musl
--exec_prefix=/data/yunboni/utils/compilers/riscv64-unknown-linux-musl
--with-sysroot=/data/yunboni/utils/compilers/riscv64-unknown-linux-musl/riscv64-unknown-linux-musl/sysroot
--enable-languages=c,c++ --with-arch=rv64gcv --with-abi=lp64d
--with-pkgversion='crosstool-NG 1.28.0.3_a3fef85' --enable-__cxa_atexit
--disable-libmudflap --disable-libgomp --disable-libssp --disable-libquadmath
--disable-libquadmath-support --disable-libsanitizer --disable-libmpx
--with-gmp=/data/yunboni/utils/compilers/cross-riscv/.build/riscv64-unknown-linux-musl/buildtools
--with-mpfr=/data/yunboni/utils/compilers/cross-riscv/.build/riscv64-unknown-linux-musl/buildtools
--with-mpc=/data/yunboni/utils/compilers/cross-riscv/.build/riscv64-unknown-linux-musl/buildtools
--with-isl=/data/yunboni/utils/compilers/cross-riscv/.build/riscv64-unknown-linux-musl/buildtools
--enable-lto --enable-threads=posix --enable-target-optspace --disable-plugin
--disable-nls --disable-multilib
--with-local-prefix=/data/yunboni/utils/compilers/riscv64-unknown-linux-musl/riscv64-unknown-linux-musl/sysroot
--enable-long-long
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 16.0.0 20251118 (experimental) (crosstool-NG 1.28.0.3_a3fef85)
```
