RPCS3/llvm-mirror
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2024-11-24 11:42:57 +01:00
Code Issues Projects Releases Wiki Activity

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

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

llvm-svn: 151918
This commit is contained in:
Benjamin Kramer 2012-03-02 15:34:35 +00:00
parent cdce896007
commit 730f1fb5b3
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/llvm/ADT/Hashing.h
View File

@ -173,7 +173,7 @@ static const uint64_t k3 = 0xc949d7c7509e6557ULL;
/// \brief Bitwise right rotate. /// \brief Bitwise right rotate.
/// Normally this will compile to a single instruction, especially if the /// Normally this will compile to a single instruction, especially if the
/// shift is a manifest constant. /// 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. // Avoid shifting by 64: doing so yields an undefined result.
return shift == 0 ? val : ((val >> shift) | (val << (64 - shift))); return shift == 0 ? val : ((val >> shift) | (val << (64 - shift)));
} }