| commit | 2c94b4201beccbd061fd679ea7e9db1381fe8357 | [log] [tgz] |
|---|---|---|
| author | Benjamin Kramer <benny.kra@googlemail.com> | Sat Jan 29 12:34:05 2011 +0000 |
| committer | Benjamin Kramer <benny.kra@googlemail.com> | Sat Jan 29 12:34:05 2011 +0000 |
| tree | c9e4e2e881b416c3a3292e02e138ca76fb48185b | |
| parent | 60f5ad46c2147af79035a43e5745e46376124780 [diff] |
Add the missing sub identity "A-(A-B) -> B" to DAGCombine. This happens e.g. for code like "X - X%10" where we lower the modulo operation to a series of multiplies and shifts that are then subtracted from X, leading to this missed optimization. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124532 91177308-0d34-0410-b5e6-96231b3b80d8