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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2015-03-26 17:12:06 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2015-03-26 17:12:06 +0000 |
| commit | 7fa8c430f748cc4b4dea08caa1a225b10a08563e (patch) | |
| tree | 7b7fe54f73b346a46003552d9d7e93c388ac426b /llvm/lib/CodeGen/SelectionDAG | |
| parent | c632cda8b2fc26a047eca25620c52d1f843332f7 (diff) | |
| download | bcm5719-llvm-7fa8c430f748cc4b4dea08caa1a225b10a08563e.tar.gz bcm5719-llvm-7fa8c430f748cc4b4dea08caa1a225b10a08563e.zip | |
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.
llvm-svn: 233291
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG')
0 files changed, 0 insertions, 0 deletions
