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x64: Simplify RDTSC on non-MSVC compilers 

Co-Authored-By: liamwhite <liamwhite@users.noreply.github.com>
This commit is contained in:
Morph 2023-03-22 16:40:41 -04:00
parent e1bce50d8b
commit 981bc8aa1c
2 changed files with 10 additions and 16 deletions
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13
src/common/x64/cpu_wait.cpp
View File

@ -33,16 +33,13 @@ __forceinline static void TPAUSE() {
} }
#else #else
static u64 FencedRDTSC() { static u64 FencedRDTSC() {
u64 result; u64 eax;
u64 edx;
asm volatile("lfence\n\t" asm volatile("lfence\n\t"
"rdtsc\n\t" "rdtsc\n\t"
"shl $32, %%rdx\n\t" "lfence\n\t"
"or %%rdx, %0\n\t" : "=a"(eax), "=d"(edx));
"lfence" return (edx << 32) | eax;
: "=a"(result)
:
: "rdx", "memory", "cc");
return result;
} }
static void TPAUSE() { static void TPAUSE() {

13
src/common/x64/native_clock.cpp
View File

@ -27,16 +27,13 @@ __forceinline static u64 FencedRDTSC() {
} }
#else #else
static u64 FencedRDTSC() { static u64 FencedRDTSC() {
u64 result; u64 eax;
u64 edx;
asm volatile("lfence\n\t" asm volatile("lfence\n\t"
"rdtsc\n\t" "rdtsc\n\t"
"shl $32, %%rdx\n\t" "lfence\n\t"
"or %%rdx, %0\n\t" : "=a"(eax), "=d"(edx));
"lfence" return (edx << 32) | eax;
: "=a"(result)
:
: "rdx", "memory", "cc");
return result;
} }
#endif #endif