https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92180
Stefan <stefan.sakalik at gmail dot com> changed:
What |Removed |Added
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CC| |stefan.sakalik at gmail dot com
--- Comment #7 from Stefan <stefan.sakalik at gmail dot com> ---
This was not completely fixed, for example this code:
https://godbolt.org/z/7W9nqTsjE
#include <bits/stdc++.h>
#include <x86intrin.h>
uint32_t rdtsc32() { return static_cast<uint32_t>(__rdtsc()); }
uint64_t rdtsc_delta(uint64_t x) {
return rdtsc32() - rdtsc32();
}
Produces
rdtsc_delta(unsigned long):
rdtsc
mov rcx, rax
sal rdx, 32
or rcx, rdx
rdtsc
sub ecx, eax
mov rax, rcx
ret
as opposed to clang version
rdtsc_delta(unsigned long):
rdtsc
mov rcx, rax
rdtsc
sub ecx, eax
mov rax, rcx
ret
