saberbud/parallel-hashmap
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manually merge some changes from abseil-cpp

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greg
2022-03-06 16:54:03 -05:00
parent cfacd26023
commit 73be7c2ab2
5 changed files with 174 additions and 63 deletions
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parallel_hashmap/phmap_bits.h
Vendored
+13 -12
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@@ -315,19 +315,19 @@ PHMAP_BASE_INTERNAL_FORCEINLINE int CountLeadingZeros64(uint64_t n) {
#endif
}
PHMAP_BASE_INTERNAL_FORCEINLINE int CountLeadingZeros32Slow(uint64_t n) {
int zeroes = 28;
PHMAP_BASE_INTERNAL_FORCEINLINE uint32_t CountLeadingZeros32Slow(uint64_t n) {
uint32_t zeroes = 28;
if (n >> 16) zeroes -= 16, n >>= 16;
if (n >> 8) zeroes -= 8, n >>= 8;
if (n >> 4) zeroes -= 4, n >>= 4;
return "\4\3\2\2\1\1\1\1\0\0\0\0\0\0\0"[n] + zeroes;
}
PHMAP_BASE_INTERNAL_FORCEINLINE int CountLeadingZeros32(uint32_t n) {
PHMAP_BASE_INTERNAL_FORCEINLINE uint32_t CountLeadingZeros32(uint32_t n) {
#if defined(_MSC_VER) && !defined(__clang__)
unsigned long result = 0; // NOLINT(runtime/int)
if (_BitScanReverse(&result, n)) {
return (int)(31 - result);
return (uint32_t)(31 - result);
}
return 32;
#elif defined(__GNUC__) || defined(__clang__)
@@ -348,8 +348,8 @@ PHMAP_BASE_INTERNAL_FORCEINLINE int CountLeadingZeros32(uint32_t n) {
#endif
}
PHMAP_BASE_INTERNAL_FORCEINLINE int CountTrailingZerosNonZero64Slow(uint64_t n) {
int c = 63;
PHMAP_BASE_INTERNAL_FORCEINLINE uint32_t CountTrailingZerosNonZero64Slow(uint64_t n) {
uint32_t c = 63;
n &= ~n + 1;
if (n & 0x00000000FFFFFFFF) c -= 32;
if (n & 0x0000FFFF0000FFFF) c -= 16;
@@ -360,11 +360,11 @@ PHMAP_BASE_INTERNAL_FORCEINLINE int CountTrailingZerosNonZero64Slow(uint64_t n)
return c;
}
PHMAP_BASE_INTERNAL_FORCEINLINE int CountTrailingZerosNonZero64(uint64_t n) {
PHMAP_BASE_INTERNAL_FORCEINLINE uint32_t CountTrailingZerosNonZero64(uint64_t n) {
#if defined(_MSC_VER) && !defined(__clang__) && defined(_M_X64)
unsigned long result = 0; // NOLINT(runtime/int)
_BitScanForward64(&result, n);
return (int)result;
return (uint32_t)result;
#elif defined(_MSC_VER) && !defined(__clang__)
unsigned long result = 0; // NOLINT(runtime/int)
if (static_cast<uint32_t>(n) == 0) {
@@ -382,8 +382,8 @@ PHMAP_BASE_INTERNAL_FORCEINLINE int CountTrailingZerosNonZero64(uint64_t n) {
#endif
}
PHMAP_BASE_INTERNAL_FORCEINLINE int CountTrailingZerosNonZero32Slow(uint32_t n) {
int c = 31;
PHMAP_BASE_INTERNAL_FORCEINLINE uint32_t CountTrailingZerosNonZero32Slow(uint32_t n) {
uint32_t c = 31;
n &= ~n + 1;
if (n & 0x0000FFFF) c -= 16;
if (n & 0x00FF00FF) c -= 8;
@@ -393,11 +393,11 @@ PHMAP_BASE_INTERNAL_FORCEINLINE int CountTrailingZerosNonZero32Slow(uint32_t n)
return c;
}
PHMAP_BASE_INTERNAL_FORCEINLINE int CountTrailingZerosNonZero32(uint32_t n) {
PHMAP_BASE_INTERNAL_FORCEINLINE uint32_t CountTrailingZerosNonZero32(uint32_t n) {
#if defined(_MSC_VER) && !defined(__clang__)
unsigned long result = 0; // NOLINT(runtime/int)
_BitScanForward(&result, n);
return (int)result;
return (uint32_t)result;
#elif defined(__GNUC__) || defined(__clang__)
static_assert(sizeof(int) == sizeof(n),
"__builtin_ctz does not take 32-bit arg");
@@ -568,6 +568,7 @@ namespace little_endian {
#endif /* ENDIAN */
// Functions to do unaligned loads and stores in little-endian order.
// ------------------------------------------------------------------
inline uint16_t Load16(const void *p) {
return ToHost16(PHMAP_INTERNAL_UNALIGNED_LOAD16(p));
}