https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88398
--- Comment #21 from ktkachov at gcc dot gnu.org ---
So the actual hot loop in xz_r does:
typedef unsigned char __uint8_t;
typedef unsigned int __uint32_t;
typedef unsigned long long __uint64_t;
int
foo (const __uint64_t len_limit, const __uint8_t *cur,
__uint32_t delta, int len) {
const __uint8_t *pb = cur - delta;
while (++len != len_limit) {
if (pb[len] != cur[len])
break;
}
return len;
}
The 'pb' pointer is the 'cur' pointer but moved back by 'delta'.
Presumably that means that all memory between 'pb' and 'delta' and could be
read in as wide a load as possible?
