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Fix reading CPU id using rdtscp.

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As pointed out in #2527, the correct register containing CPU id should be ecx
instead edx.
This commit is contained in:
Qi Wang 2023-08-28 10:21:11 -07:00 committed by Qi Wang
parent 87c56c8df8
commit b71da25b8a
1 changed files with 3 additions and 3 deletions
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6
include/jemalloc/internal/jemalloc_internal_inlines_a.h
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@ -19,9 +19,9 @@ malloc_getcpu(void) {
#elif defined(JEMALLOC_HAVE_SCHED_GETCPU)
return (malloc_cpuid_t)sched_getcpu();
#elif defined(JEMALLOC_HAVE_RDTSCP)
unsigned int ax, cx, dx;
asm volatile("rdtscp" : "=a"(ax), "=d"(dx), "=c"(cx) ::);
return (malloc_cpuid_t)(dx & 0xfff);
unsigned int ecx;
asm volatile("rdtscp" : "=c" (ecx) :: "eax", "edx");
return (malloc_cpuid_t)(ecx & 0xfff);
#elif defined(__aarch64__) && defined(__APPLE__)
/* Other oses most likely use tpidr_el0 instead */
uintptr_t c;