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| author | Evan Cheng <evan.cheng@apple.com> | 2011-06-21 06:01:08 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2011-06-21 06:01:08 +0000 |
| commit | 9568e5c3c3f1e25288d2ff375dba0fddbf161fd6 (patch) | |
| tree | 99a69f068fb095c0e55cf54f82e9c4db93667143 /lib/Transforms/Utils/LoopUnroll.cpp | |
| parent | 2fabd464ae9fd33f068066e3fc3d0caa7ea2279d (diff) | |
Teach dag combine to match halfword byteswap patterns.
1. (((x) & 0xFF00) >> 8) | (((x) & 0x00FF) << 8)
=> (bswap x) >> 16
2. ((x&0xff)<<8)|((x&0xff00)>>8)|((x&0xff000000)>>8)|((x&0x00ff0000)<<8))
=> (rotl (bswap x) 16)
This allows us to eliminate most of the def : Pat patterns for ARM rev16
revsh instructions. It catches many more cases for ARM and x86.
rdar://9609108
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133503 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Utils/LoopUnroll.cpp')
0 files changed, 0 insertions, 0 deletions