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| author | Craig Topper <craig.topper@gmail.com> | 2012-01-07 09:06:39 +0000 |
|---|---|---|
| committer | Craig Topper <craig.topper@gmail.com> | 2012-01-07 09:06:39 +0000 |
| commit | cc274526ef801c23083bb76e335bb5152dddcc58 (patch) | |
| tree | 239487f442685b2fe7de3904cc07144f6163cf1e /lib/CodeGen/MachineCopyPropagation.cpp | |
| parent | 82f000266a93c6e18e7db23c6736a73dd31f46c1 (diff) | |
Add some DAG combines for SUBC/SUBE. If nothing uses the carry/borrow out of subc, turn it into a sub. Turn (subc x, x) into 0 with no borrow. Turn (subc x, 0) into x with no borrow. Turn (subc -1, x) into (xor x, -1) with no borrow. Turn sube with no borrow in into subc.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147728 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/MachineCopyPropagation.cpp')
0 files changed, 0 insertions, 0 deletions