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| author | Dan Gohman <gohman@apple.com> | 2009-02-24 02:00:40 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2009-02-24 02:00:40 +0000 |
| commit | 0001e56f15215ae4bc5fffb82eec5c4828b888f0 (patch) | |
| tree | c14953e84d899048fdcd5828b6b2b4ecac2ccb2a /test/Transforms/InstCombine/ashr-nop.ll | |
| parent | c34fea3935dcc0cab13cfb5cb60471bd49089230 (diff) | |
| download | llvm-0001e56f15215ae4bc5fffb82eec5c4828b888f0.tar.gz llvm-0001e56f15215ae4bc5fffb82eec5c4828b888f0.tar.bz2 llvm-0001e56f15215ae4bc5fffb82eec5c4828b888f0.tar.xz | |
Fix a ValueTracking rule: RHS means operand 1, not 0. Add a simple
ashr instcombine to help expose this code. And apply the fix to
SelectionDAG's copy of this code too.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65364 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/InstCombine/ashr-nop.ll')
| -rw-r--r-- | test/Transforms/InstCombine/ashr-nop.ll | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/ashr-nop.ll b/test/Transforms/InstCombine/ashr-nop.ll new file mode 100644 index 0000000000..bb0da346b0 --- /dev/null +++ b/test/Transforms/InstCombine/ashr-nop.ll @@ -0,0 +1,8 @@ +; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep ashr + +define i32 @foo(i32 %x) { + %o = and i32 %x, 1 + %n = add i32 %o, -1 + %t = ashr i32 %n, 17 + ret i32 %t +} |