| commit | 7d77c5caa7216c96c68a6c4f1042b1b5c01e1ae2 | [log] [tgz] |
|---|---|---|
| author | Peter Collingbourne <peter@pcc.me.uk> | Fri Oct 21 19:57:55 2016 +0000 |
| committer | Peter Collingbourne <peter@pcc.me.uk> | Fri Oct 21 19:57:55 2016 +0000 |
| tree | 945b752f8e360f0332b690444ac28f146b2c3058 | |
| parent | b859d6d852eb5355d6fed6fda27c6270f99301f7 [diff] |
X86: Improve BT instruction selection for 64-bit values. If a 64-bit value is tested against a bit which is known to be in the range [0..31) (modulo 64), we can use the 32-bit BT instruction, which has a slightly shorter encoding. Differential Revision: https://reviews.llvm.org/D25862 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@284864 91177308-0d34-0410-b5e6-96231b3b80d8