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Define umul128 in phmap namespace. #273

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Merged
greg7mdp merged 2 commits into from
Apr 11, 2025
Merged

Define umul128 in phmap namespace. #273

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2f71d2e
Define `umul128` in `phmap` namespace.
greg7mdp Apr 11, 2025
f99df6b
Merge branch 'master' of github.com:greg7mdp/parallel-hashmap into gh…
greg7mdp Apr 11, 2025
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2 changes: 1 addition & 1 deletion examples/insert_bench.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -62,7 +62,7 @@ class sfc64 {
uint64_t operator()(uint64_t boundExcluded) noexcept {
#ifdef PHMAP_HAS_UMUL128
uint64_t h;
(void)umul128(operator()(), boundExcluded, &h);
(void)phmap::umul128(operator()(), boundExcluded, &h);
return h;
#else
return 0;
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59 changes: 30 additions & 29 deletions parallel_hashmap/phmap_bits.h
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Expand Up @@ -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__)
Expand Down Expand Up @@ -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) {
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