| commit | 8f820e94954d2120055a4c7bfafb3c913fa0295a | [log] [tgz] |
|---|---|---|
| author | Benjamin Kramer <benny.kra@googlemail.com> | Thu Mar 26 17:12:06 2015 +0000 |
| committer | Benjamin Kramer <benny.kra@googlemail.com> | Thu Mar 26 17:12:06 2015 +0000 |
| tree | 6b6f69239e8b325111a53ab7001ae98ed03c29b1 | |
| parent | 27d12f3e6e2079c9d9d69caae267ed0320109ffa [diff] |
InstCombine: fold (A << C) == (B << C) --> ((A^B) & (~0U >> C)) == 0 Anding and comparing with zero can be done in a single instruction on most archs so this is a bit cheaper. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233291 91177308-0d34-0410-b5e6-96231b3b80d8