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| author | Sanjay Patel <spatel@rotateright.com> | 2017-04-05 17:57:05 +0000 |
|---|---|---|
| committer | Sanjay Patel <spatel@rotateright.com> | 2017-04-05 17:57:05 +0000 |
| commit | 50c82c439518eb40a1fe875fe23dd581d4764c0d (patch) | |
| tree | 3343b86bca4e711c90c60d897851b6015c31b604 /llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | |
| parent | 4ecee77c9aeb4928efbf5d5cf107ab9996e7407e (diff) | |
| download | bcm5719-llvm-50c82c439518eb40a1fe875fe23dd581d4764c0d.tar.gz bcm5719-llvm-50c82c439518eb40a1fe875fe23dd581d4764c0d.zip | |
[InstCombine] add fold for icmp with or mask of low bits (PR32542)
We already have these 'and' folds:
// X & -C == -C -> X > u ~C
// X & -C != -C -> X <= u ~C
// iff C is a power of 2
...but we were missing the 'or' siblings.
http://rise4fun.com/Alive/n6
This should improve:
https://bugs.llvm.org/show_bug.cgi?id=32524
...but there are 2 or more other pieces to fix still.
Differential Revision: https://reviews.llvm.org/D31712
llvm-svn: 299570
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
0 files changed, 0 insertions, 0 deletions
