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| author | David Majnemer <david.majnemer@gmail.com> | 2014-12-10 09:14:52 +0000 |
|---|---|---|
| committer | David Majnemer <david.majnemer@gmail.com> | 2014-12-10 09:14:52 +0000 |
| commit | ae707582c024e5db30f13d3fc3a7f21e72c4bc18 (patch) | |
| tree | 79fb236821bcc58280ef4e8927a6233e406eaea4 /llvm/test/Transforms | |
| parent | 0104ff65294a1a56af4b7260a57ed4da9ddf8af7 (diff) | |
| download | bcm5719-llvm-ae707582c024e5db30f13d3fc3a7f21e72c4bc18.tar.gz bcm5719-llvm-ae707582c024e5db30f13d3fc3a7f21e72c4bc18.zip | |
InstSimplify: [al]shr exact undef, %X -> undef
Exact shifts always keep the non-zero bits of their input. This means
it keeps it's undef bits.
llvm-svn: 223923
Diffstat (limited to 'llvm/test/Transforms')
| -rw-r--r-- | llvm/test/Transforms/InstSimplify/undef.ll | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstSimplify/undef.ll b/llvm/test/Transforms/InstSimplify/undef.ll index a6ae7a9fbf7..3742d7450af 100644 --- a/llvm/test/Transforms/InstSimplify/undef.ll +++ b/llvm/test/Transforms/InstSimplify/undef.ll @@ -174,3 +174,17 @@ define i32 @test21(i32 %a) { %b = sdiv i32 %a, 0 ret i32 %b } + +; CHECK-LABEL: @test22 +; CHECK: ret i32 undef +define i32 @test22(i32 %a) { + %b = ashr exact i32 undef, %a + ret i32 %b +} + +; CHECK-LABEL: @test23 +; CHECK: ret i32 undef +define i32 @test23(i32 %a) { + %b = lshr exact i32 undef, %a + ret i32 %b +} |
