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perf_hooks: add event loop delay sampler #25378

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perf_hooks: add event loop delay sampler #25378

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b88df96
perf_hooks: implement histogram based api
jasnell Jan 7, 2019
386f06b
deps: float fix for building HdrHistogram on Win x86
jasnell Feb 7, 2019
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deps: float fix for building HdrHistogram on Win x86 
From:
mcollina/native-hdr-histogram@c63e971
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@jasnell
jasnell committed Feb 7, 2019
commit 386f06b9b3fbcd8a126f3d1369e80812430481e7
19 changes: 17 additions & 2 deletions deps/histogram/src/hdr_histogram.c
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Expand Up @@ -91,14 +91,29 @@ static int64_t power(int64_t base, int64_t exp)
}

#if defined(_MSC_VER)
#pragma intrinsic(_BitScanReverse64)
# if defined(_WIN64)
# pragma intrinsic(_BitScanReverse64)
# else
# pragma intrinsic(_BitScanReverse)
# endif
#endif

static int32_t get_bucket_index(const struct hdr_histogram* h, int64_t value)
{
#if defined(_MSC_VER)
uint32_t leading_zero = 0;
_BitScanReverse64(&leading_zero, value | h->sub_bucket_mask);
int64_t masked_value = value | h->sub_bucket_mask;
# if defined(_WIN64)
_BitScanReverse64(&leading_zero, masked_value);
# else
uint32_t high = masked_value >> 32;
if (_BitScanReverse(&leading_zero, high)) {
leading_zero += 32;
} else {
uint32_t low = masked_value & 0x00000000FFFFFFFF;
_BitScanReverse(&leading_zero, low);
}
# endif
int32_t pow2ceiling = 64 - (63 - leading_zero); /* smallest power of 2 containing value */
#else
int32_t pow2ceiling = 64 - __builtin_clzll(value | h->sub_bucket_mask); /* smallest power of 2 containing value */
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