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cycles.c: add powerpc64* support #291

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Merged
RyanGlScott merged 1 commit into from
Jul 2, 2026
+13 −0
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cycles.c: add powerpc64* support #291

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13 changes: 13 additions & 0 deletions criterion-measurement/cbits/cycles.c
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,19 @@ StgWord64 criterion_rdtsc(void)
return ret;
}

#elif powerpc64le_HOST_ARCH || powerpc64_HOST_ARCH

StgWord64 criterion_rdtsc(void)
{
// Read the PowerPC Time Base: a monotonically-increasing 64-bit counter
// that is the architectural analogue of x86's TSC. SPR 268 returns the
// full 64-bit Time Base on 64-bit PowerPC (this is what the deprecated
// `mftb` mnemonic expanded to).
StgWord64 ret;
__asm__ __volatile__ ("mfspr %0, 268" : "=r"(ret));
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return ret;
}

#elif x86_64_HOST_ARCH || i386_HOST_ARCH

StgWord64 criterion_rdtsc(void)
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