| commit | 41dc0fcb68e7ea5d7c043af2a6303adfdad19c72 | [log] [tgz] |
|---|---|---|
| author | Chris Lattner <sabre@nondot.org> | Fri Mar 21 05:19:58 2008 +0000 |
| committer | Chris Lattner <sabre@nondot.org> | Fri Mar 21 05:19:58 2008 +0000 |
| tree | 05a451b401a19eabcd7223c1279f3675a318a197 | |
| parent | fa5a91a71ee3c62c6f0bc6cc1388175ad6f925c4 [diff] |
Teach masked value is zero about add and sub, and use MVIZ to simplify things like (X & 4) >> 1 == 2 --> (X & 4) == 4. since it is obvious that the shift doesn't remove any bits. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48631 91177308-0d34-0410-b5e6-96231b3b80d8