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Define umul128 in phmap namespace. (#273)

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This commit is contained in:
Gregory Popovitch
2025-04-11 10:24:44 -04:00
committed by GitHub
parent 40780b29bd
commit 896f1a03e4
2 changed files with 31 additions and 30 deletions
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parallel_hashmap/phmap_bits.h
Vendored
+30 -29
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@@ -176,35 +176,6 @@ inline void UnalignedStore64(void *p, uint64_t v) { memcpy(p, &v, sizeof v); }
#define PHMAP_BLOCK_TAIL_CALL_OPTIMIZATION() if (volatile int x = 0) { (void)x; }
#endif
#if defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wpedantic"
#endif
#ifdef PHMAP_HAVE_INTRINSIC_INT128
__extension__ typedef unsigned __int128 phmap_uint128;
inline uint64_t umul128(uint64_t a, uint64_t b, uint64_t* high)
{
auto result = static_cast<phmap_uint128>(a) * static_cast<phmap_uint128>(b);
*high = static_cast<uint64_t>(result >> 64);
return static_cast<uint64_t>(result);
}
#define PHMAP_HAS_UMUL128 1
#elif (defined(_MSC_VER))
#if defined(_M_X64)
#pragma intrinsic(_umul128)
inline uint64_t umul128(uint64_t a, uint64_t b, uint64_t* high)
{
return _umul128(a, b, high);
}
#define PHMAP_HAS_UMUL128 1
#endif
#endif
#if defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
#if defined(__GNUC__)
// Cache line alignment
#if defined(__i386__) || defined(__x86_64__)
@@ -268,6 +239,36 @@ inline void UnalignedStore64(void *p, uint64_t v) { memcpy(p, &v, sizeof v); }
namespace phmap {
#if defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wpedantic"
#endif
#ifdef PHMAP_HAVE_INTRINSIC_INT128
__extension__ typedef unsigned __int128 phmap_uint128;
inline uint64_t umul128(uint64_t a, uint64_t b, uint64_t* high)
{
auto result = static_cast<phmap_uint128>(a) * static_cast<phmap_uint128>(b);
*high = static_cast<uint64_t>(result >> 64);
return static_cast<uint64_t>(result);
}
#define PHMAP_HAS_UMUL128 1
#elif (defined(_MSC_VER))
#if defined(_M_X64)
#pragma intrinsic(_umul128)
inline uint64_t umul128(uint64_t a, uint64_t b, uint64_t* high)
{
return _umul128(a, b, high);
}
#define PHMAP_HAS_UMUL128 1
#endif
#endif
#if defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
namespace base_internal {
PHMAP_BASE_INTERNAL_FORCEINLINE uint32_t CountLeadingZeros64Slow(uint64_t n) {