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| author | Jakub Staszak <jstaszak@apple.com> | 2011-07-27 16:00:40 +0000 |
|---|---|---|
| committer | Jakub Staszak <jstaszak@apple.com> | 2011-07-27 16:00:40 +0000 |
| commit | 9b8a6a3b2b28dbe84f9e25d1b5c4832da372a96f (patch) | |
| tree | 90c5b061dcde4ed9b79585b3168414d582fa0878 /llvm/lib/Support/BlockFrequency.cpp | |
| parent | a9e8aa04822cb18c3ebd0ab49ce3237d7f7699ad (diff) | |
| download | bcm5719-llvm-9b8a6a3b2b28dbe84f9e25d1b5c4832da372a96f.tar.gz bcm5719-llvm-9b8a6a3b2b28dbe84f9e25d1b5c4832da372a96f.zip | |
Optimize 96-bit division a little bit.
llvm-svn: 136222
Diffstat (limited to 'llvm/lib/Support/BlockFrequency.cpp')
| -rw-r--r-- | llvm/lib/Support/BlockFrequency.cpp | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/llvm/lib/Support/BlockFrequency.cpp b/llvm/lib/Support/BlockFrequency.cpp index 0bc78408104..a63bf83f203 100644 --- a/llvm/lib/Support/BlockFrequency.cpp +++ b/llvm/lib/Support/BlockFrequency.cpp @@ -46,8 +46,9 @@ void mult96bit(uint64_t freq, uint32_t N, uint64_t W[2]) { uint64_t div96bit(uint64_t W[2], uint32_t D) { uint64_t y = W[0]; uint64_t x = W[1]; + int i; - for (int i = 1; i <= 64; ++i) { + for (i = 1; i <= 64 && x; ++i) { uint32_t t = (int)x >> 31; x = (x << 1) | (y >> 63); y = y << 1; @@ -57,7 +58,7 @@ uint64_t div96bit(uint64_t W[2], uint32_t D) { } } - return y; + return y << (64 - i + 1); } } |
