6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-01-18 13:34:04 +00:00
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.

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
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.
/// 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)));
}