https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116318
Bug ID: 116318
Summary: RISC-V: Miscompile at -O1 with -fwhole-program
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: patrick at rivosinc dot com
Target Milestone: ---
Testcase:
int a, c, d;
short b[][8] = {};
int main() {
for (; d < 7; d++) {
a = b[d][c];
__builtin_printf("%lX\n", a ^ 4095UL);
}
}
Commands:
> /scratch/tc-testing/tc-compiler-fuzz-trunk/build-gcv/bin/riscv64-unknown-linux-gnu-gcc
> -fwhole-program -O1 preprocessed.c -o test.o
> /scratch/tc-testing/tc-compiler-fuzz-trunk/build-gcv/bin/qemu-riscv64 test.o
14FE
FC3
F97
75FC
FE7
FEB
FFF
> /scratch/tc-testing/tc-compiler-fuzz-trunk/build-gcv/bin/riscv64-unknown-linux-gnu-gcc
> -fwhole-program -O0 preprocessed.c -o test.o
> /scratch/tc-testing/tc-compiler-fuzz-trunk/build-gcv/bin/qemu-riscv64 test.o
FFF
FFF
FFF
FFF
FFF
FFF
FFF
Found via fuzzer.
