| commit | 009da05e750b7bac7e1902fcdc85394de4ea63b3 | [log] [tgz] |
|---|---|---|
| author | Benjamin Kramer <benny.kra@googlemail.com> | Sat Dec 24 17:31:46 2011 +0000 |
| committer | Benjamin Kramer <benny.kra@googlemail.com> | Sat Dec 24 17:31:46 2011 +0000 |
| tree | 87dc3949e2f937b584c060248a4fcdf271f6427b | |
| parent | 1fdfae05b0a4356d1ed0633bf3d6cdc6eba2e173 [diff] |
ComputeMaskedBits: Make knownzero computation more aggressive for ctlz with undef zero.
unsigned foo(unsigned x) { return 31 - __builtin_clz(x); }
now compiles into a single "bsrl" instruction on x86.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147255 91177308-0d34-0410-b5e6-96231b3b80d8