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26 lines
552 B
C
26 lines
552 B
C
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/sysctl.h>
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long long cpucycles_amd64cpuspeed(void)
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{
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unsigned long long result;
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asm volatile(".byte 15;.byte 49;shlq $32,%%rdx;orq %%rdx,%%rax"
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: "=a" (result) :: "%rdx");
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return result;
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}
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long long cpucycles_amd64cpuspeed_persecond(void)
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{
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int oid[2];
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int val;
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size_t size;
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oid[0] = CTL_HW;
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oid[1] = HW_CPUSPEED;
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size = sizeof val;
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if (sysctl(oid,2,&val,&size,0,0) == -1) return 0;
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if (size != sizeof val) return 0;
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return val * 1000000LL;
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}
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