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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2011-05-14 15:57:25 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2011-05-14 15:57:25 +0000 |
| commit | 10fcfb53fdc77061841e815e8b4cd62b48d5767d (patch) | |
| tree | bb0f56999b037326d614eb9167d1e96be6f18c10 /test/Transforms | |
| parent | 67f071e69795dca1151cdb8d57d222b6f041d748 (diff) | |
| download | external_llvm-10fcfb53fdc77061841e815e8b4cd62b48d5767d.zip external_llvm-10fcfb53fdc77061841e815e8b4cd62b48d5767d.tar.gz external_llvm-10fcfb53fdc77061841e815e8b4cd62b48d5767d.tar.bz2 | |
SimplifyCFG: Use ComputeMaskedBits to prune dead cases from switch instructions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131345 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms')
| -rw-r--r-- | test/Transforms/SimplifyCFG/switch-masked-bits.ll | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/test/Transforms/SimplifyCFG/switch-masked-bits.ll b/test/Transforms/SimplifyCFG/switch-masked-bits.ll new file mode 100644 index 0000000..fc83ec2 --- /dev/null +++ b/test/Transforms/SimplifyCFG/switch-masked-bits.ll @@ -0,0 +1,38 @@ +; RUN: opt -S -simplifycfg < %s | FileCheck %s + +define i32 @test1(i32 %x) nounwind { + %i = shl i32 %x, 1 + switch i32 %i, label %a [ + i32 21, label %b + i32 24, label %c + ] + +a: + ret i32 0 +b: + ret i32 3 +c: + ret i32 5 +; CHECK: @test1 +; CHECK: %cond = icmp eq i32 %i, 24 +; CHECK: %merge = select i1 %cond, i32 5, i32 0 +; CHECK: ret i32 %merge +} + + +define i32 @test2(i32 %x) nounwind { + %i = shl i32 %x, 1 + switch i32 %i, label %a [ + i32 21, label %b + i32 23, label %c + ] + +a: + ret i32 0 +b: + ret i32 3 +c: + ret i32 5 +; CHECK: @test2 +; CHECK: ret i32 0 +} |