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Reverting back to the fallback instead of using the 64-bit popcnt instruction as it doesn't exist on all x64 CPU architectures.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172751 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Aaron Ballman 2013-01-17 20:04:28 +00:00
parent 634bd8512a
commit cb4830cc99
1 changed files with 0 additions and 2 deletions
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include/llvm/Support/MathExtras.h
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@ -315,8 +315,6 @@ inline unsigned CountPopulation_32(uint32_t Value) {
inline unsigned CountPopulation_64(uint64_t Value) {
#if __GNUC__ >= 4
return __builtin_popcountll(Value);
#elif defined(_MSC_VER) && defined(_M_X64)
return __popcnt64(Value);
#else
uint64_t v = Value - ((Value >> 1) & 0x5555555555555555ULL);
v = (v & 0x3333333333333333ULL) + ((v >> 2) & 0x3333333333333333ULL);