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dcd188d33f
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47110 91177308-0d34-0410-b5e6-96231b3b80d8
27 lines
606 B
LLVM
27 lines
606 B
LLVM
; This testcase ensures that redundant loads are preserved when they are not
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; allowed to be eliminated.
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; RUN: llvm-as < %s | opt -load-vn -gcse | llvm-dis | grep sub
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;
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define i32 @test1(i32* %P) {
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%A = load i32* %P ; <i32> [#uses=1]
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store i32 1, i32* %P
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%B = load i32* %P ; <i32> [#uses=1]
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%C = sub i32 %A, %B ; <i32> [#uses=1]
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ret i32 %C
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}
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define i32 @test2(i32* %P) {
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%A = load i32* %P ; <i32> [#uses=1]
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br label %BB2
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BB2: ; preds = %0
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store i32 5, i32* %P
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br label %BB3
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BB3: ; preds = %BB2
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%B = load i32* %P ; <i32> [#uses=1]
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%C = sub i32 %A, %B ; <i32> [#uses=1]
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ret i32 %C
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}
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