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-rw-r--r--src/common/x64/native_clock.cpp13
1 files changed, 5 insertions, 8 deletions
diff --git a/src/common/x64/native_clock.cpp b/src/common/x64/native_clock.cpp
index 76c66e7ee..277b00662 100644
--- a/src/common/x64/native_clock.cpp
+++ b/src/common/x64/native_clock.cpp
@@ -27,16 +27,13 @@ __forceinline static u64 FencedRDTSC() {
}
#else
static u64 FencedRDTSC() {
- u64 result;
+ u64 eax;
+ u64 edx;
asm volatile("lfence\n\t"
"rdtsc\n\t"
- "shl $32, %%rdx\n\t"
- "or %%rdx, %0\n\t"
- "lfence"
- : "=a"(result)
- :
- : "rdx", "memory", "cc");
- return result;
+ "lfence\n\t"
+ : "=a"(eax), "=d"(edx));
+ return (edx << 32) | eax;
}
#endif