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tsc: use compiler intrinsics

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This commit is contained in:
Steffen Vogel 2021-09-13 15:11:51 +02:00
parent 6f39cbc8a6
commit a028429119
1 changed files with 4 additions and 38 deletions
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42
common/include/villas/tsc.h
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@ -29,6 +29,7 @@
#include <cpuid.h> #include <cpuid.h>
#include <cinttypes> #include <cinttypes>
#include <x86intrin.h>
#ifdef __APPLE__ #ifdef __APPLE__
#include <sys/types.h> #include <sys/types.h>
@ -51,48 +52,13 @@ struct tsc {
bool is_invariant; bool is_invariant;
}; };
/** Get CPU timestep counter */
__attribute__((unused,always_inline))
static inline uint64_t rdtscp()
{
uint64_t tsc;
__asm__ __volatile__(
"rdtscp;"
"shl $32, %%rdx;"
"or %%rdx,%%rax"
: "=a" (tsc)
:
: "%rcx", "%rdx", "memory"
);
return tsc;
}
__attribute__((unused,always_inline))
static inline uint64_t rdtsc()
{
uint64_t tsc;
__asm__ __volatile__(
"lfence;"
"rdtsc;"
"shl $32, %%rdx;"
"or %%rdx,%%rax"
: "=a" (tsc)
:
: "%rcx", "%rdx", "memory"
);
return tsc;
}
__attribute__((unused)) __attribute__((unused))
static uint64_t tsc_now(struct tsc *t) static uint64_t tsc_now(struct tsc *t)
{ {
uint32_t tsc_aux;
return t->rdtscp_supported return t->rdtscp_supported
? rdtscp() ? __rdtscp(&tsc_aux)
: rdtsc(); : __rdtsc();
} }
int tsc_init(struct tsc *t) __attribute__ ((warn_unused_result)); int tsc_init(struct tsc *t) __attribute__ ((warn_unused_result));