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Hashing: microoptimize a truncate on 64 bit away. This currently blocks dead code eliminating the conditional.

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The optimizer should handle this eventually, but currently LVI isn't really designed for this kind of stuff.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151918 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2012-03-02 15:34:35 +00:00
parent 9b3b95fab7
commit 0c7374d87e
1 changed files with 1 additions and 1 deletions
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include/llvm/ADT/Hashing.h
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@ -173,7 +173,7 @@ static const uint64_t k3 = 0xc949d7c7509e6557ULL;
/// \brief Bitwise right rotate.
/// Normally this will compile to a single instruction, especially if the
/// shift is a manifest constant.
inline uint64_t rotate(uint64_t val, unsigned shift) {
inline uint64_t rotate(uint64_t val, size_t shift) {
// Avoid shifting by 64: doing so yields an undefined result.
return shift == 0 ? val : ((val >> shift) | (val << (64 - shift)));
}