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[DenseMap] Update combineHashValue #95970

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Merged
merged 4 commits into from
Jun 19, 2024
Merged

[DenseMap] Update combineHashValue #95970

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2ede7c1
[𝘀𝗽𝗿] initial version
MaskRay Jun 18, 2024
2d24f5c
rebase after statepoint fix 8ea31db27211ed0c8207b4b4b0839e5cbe780c73
MaskRay Jun 19, 2024
ac95ae7
simpler mixer
MaskRay Jun 19, 2024
7cf9dfb
rebase
MaskRay Jun 19, 2024
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18 changes: 8 additions & 10 deletions llvm/include/llvm/ADT/DenseMapInfo.h
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Original file line number Diff line number Diff line change
Expand Up @@ -26,17 +26,15 @@ namespace llvm {
namespace detail {

/// Simplistic combination of 32-bit hash values into 32-bit hash values.
/// This uses a Murmur3-type mixer "Moremur" from Pelle Evensen.
static inline unsigned combineHashValue(unsigned a, unsigned b) {
uint64_t key = (uint64_t)a << 32 | (uint64_t)b;
key += ~(key << 32);
key ^= (key >> 22);
key += ~(key << 13);
key ^= (key >> 8);
key += (key << 3);
key ^= (key >> 15);
key += ~(key << 27);
key ^= (key >> 31);
return (unsigned)key;
uint64_t x = (uint64_t)a << 32 | (uint64_t)b;
x ^= x >> 27;
x *= 0x3C79AC492BA7B653UL;
x ^= x >> 33;
x *= 0x1C69B3F74AC4AE35UL;
x ^= x >> 27;
return (unsigned)x;
}

} // end namespace detail
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