Copy of the reproducer:
-----
#include <stdint.h>
#include <stdio.h>
#ifndef NCOUNTS
#define NCOUNTS 2
#endif
typedef struct {
uint32_t state[5];
uint32_t count[NCOUNTS];
unsigned char buffer[64];
} SHA1_CTX;
void finalcount_av(SHA1_CTX *restrict ctx, unsigned char *restrict finalcount) {
// ctx->count is: uint32_t count[2];
int count_idx;
for (int i = 0; i < 4*NCOUNTS; i++) {
count_idx = (4*NCOUNTS - i - 1)/4; // generic but equivalent for
NCOUNTS==2.
finalcount[i] = (unsigned char)((ctx->count[count_idx] >> ((3-(i & 3))
* 8) ) & 255);
}
}
void finalcount_bv(SHA1_CTX *restrict ctx, unsigned char *restrict finalcount) {
for (int i=0; i < 4*NCOUNTS; i += 4) {
int ci = (4*NCOUNTS - i - 1)/4;
finalcount[i+0] = (unsigned char)((ctx->count[ci] >> (3 * 8) ) & 255);
finalcount[i+1] = (unsigned char)((ctx->count[ci] >> (2 * 8) ) & 255);
finalcount[i+2] = (unsigned char)((ctx->count[ci] >> (1 * 8) ) & 255);
finalcount[i+3] = (unsigned char)((ctx->count[ci] >> (0 * 8) ) & 255);
}
}
int main() {
unsigned char fa[NCOUNTS*4];
unsigned char fb[NCOUNTS*4];
uint32_t *for_print;
int i;
SHA1_CTX ctx;
ctx.count[0] = 0xaaaaaa00;
ctx.count[1] = 0xbbbbbb00;
if (NCOUNTS >2 ) ctx.count[2] = 0xcccccc00;
if (NCOUNTS >3 ) ctx.count[3] = 0xdddddd00;
finalcount_av(&ctx, fa);
finalcount_bv(&ctx, fb);
int ok = 1;
for (i=0; i<NCOUNTS*4; i++) {
ok &= fa[i] == fb[i];
}
if (!ok) {
for_print = (uint32_t*)fb;
printf("ERROR: expected ");
for (i=0; i<NCOUNTS; i++) {
printf("0x%08x ",for_print[i]);
}
for_print = (uint32_t*)fa;
printf("but got ");
for (i=0; i<NCOUNTS; i++) {
printf("0x%08x ",for_print[i]);
}
printf("\n");
return 1;
} else {
for_print = (uint32_t*)fa;
printf("PASS: got ");
for (i=0; i<NCOUNTS; i++) {
printf("0x%08x ",for_print[i]);
}
printf("as expected\n");
return 0;
}
}
-----
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https://bugs.launchpad.net/bugs/2101084
Title:
GCC produces wrong code for arm64+sve in some cases
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