https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121906
Bug ID: 121906
Summary: [Trunk] Loongarch64: miscompile at -O2
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: xxs_chy at outlook dot com
Target Milestone: ---
Testcase:
#include <stdint.h>
#include <stdio.h>
typedef uint16_t a;
typedef uint64_t uint64;
typedef a b __attribute__((vector_size(8)));
typedef a c __attribute__((vector_size(16)));
uint64 d[10];
int32_t e, s, r, i, g;
int32_t f[6][3][8];
c m;
uint32_t j(uint16_t, int32_t *, uint32_t, int32_t, uint16_t);
int32_t k() {
int32_t *l;
j(f[3][2][6], l, 0, g, 0);
}
uint32_t j(uint16_t, int32_t *, uint32_t, int32_t, uint16_t) {
b n = {1};
uint64 *o = &d[2];
p:
asm goto("" : : : : q);
n[3] = (-(c){
0, 0, 0, 0,
m[7]})[~(__attribute__((__vector_size__(sizeof(uint64)))) uint64){}[0] <
8
?: 7];
for (; e >= 0; e--) {
*o = n[0];
for (; i;)
goto p;
q:
}
}
int main() {
k();
printf("0x%016llx\n", d[2]);
}
Commands:
> loongarch64-unknown-linux-gnu-gcc -static -O2 reduced.c && qemu-loongarch64
> 0x0000000000000000
> loongarch64-unknown-linux-gnu-gcc -static -O0/O1/O3 reduced.c &&
> qemu-loongarch64
> 0x0000000000000001
