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| author | Chris Lattner <sabre@nondot.org> | 2010-01-04 06:03:59 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2010-01-04 06:03:59 +0000 |
| commit | e4412c1f0b636980d77a518b76e94559830eeaed (patch) | |
| tree | c9a87c184827577f46b5ab6a46bea23b70ee068b /lib/Target | |
| parent | d0592d3be68e60a77c0bb98ad4861648e16e467c (diff) | |
| download | external_llvm-e4412c1f0b636980d77a518b76e94559830eeaed.zip external_llvm-e4412c1f0b636980d77a518b76e94559830eeaed.tar.gz external_llvm-e4412c1f0b636980d77a518b76e94559830eeaed.tar.bz2 | |
implement an instcombine xform needed by clang's codegen
on the example in PR4216. This doesn't trigger in the testsuite,
so I'd really appreciate someone scrutinizing the logic for
correctness.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92458 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target')
| -rw-r--r-- | lib/Target/README.txt | 13 |
1 files changed, 0 insertions, 13 deletions
diff --git a/lib/Target/README.txt b/lib/Target/README.txt index a6e05fa..22dadfe 100644 --- a/lib/Target/README.txt +++ b/lib/Target/README.txt @@ -282,19 +282,6 @@ this requires TBAA. //===---------------------------------------------------------------------===// -This should be optimized to one 'and' and one 'or', from PR4216: - -define i32 @test_bitfield(i32 %bf.prev.low) nounwind ssp { -entry: - %bf.prev.lo.cleared10 = or i32 %bf.prev.low, 32962 ; <i32> [#uses=1] - %0 = and i32 %bf.prev.low, -65536 ; <i32> [#uses=1] - %1 = and i32 %bf.prev.lo.cleared10, 40186 ; <i32> [#uses=1] - %2 = or i32 %1, %0 ; <i32> [#uses=1] - ret i32 %2 -} - -//===---------------------------------------------------------------------===// - This isn't recognized as bswap by instcombine (yes, it really is bswap): unsigned long reverse(unsigned v) { |