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| author | Evan Cheng <evan.cheng@apple.com> | 2010-01-13 00:30:23 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2010-01-13 00:30:23 +0000 |
| commit | 7da9ecf9677b751d81515f95168ae3cb2df54160 (patch) | |
| tree | 5d592a77614fbce75d4d1f67d0ec62609b829027 /lib/Bitcode/Writer/BitcodeWriter.cpp | |
| parent | 5f72a5ebc84a1935878b5b2d3166a505c520cdfc (diff) | |
Add a quick pass to optimize sign / zero extension instructions. For targets where the pre-extension values are available in the subreg of the result of the extension, replace the uses of the pre-extension value with the result + extract_subreg.
For now, this pass is fairly conservative. It only perform the replacement when both the pre- and post- extension values are used in the block. It will miss cases where the post-extension values are live, but not used.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93278 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Bitcode/Writer/BitcodeWriter.cpp')
0 files changed, 0 insertions, 0 deletions