37 lines
890 B
LLVM
37 lines
890 B
LLVM
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; RUN: opt < %s -basic-aa -gvn -S | FileCheck %s
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define i32 @main(i32* %p, i32 %x, i32 %y) {
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block1:
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%z = load i32, i32* %p
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%cmp = icmp eq i32 %x, %y
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br i1 %cmp, label %block2, label %block3
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block2:
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br label %block4
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block3:
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%b = bitcast i32 0 to i32
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store i32 %b, i32* %p
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br label %block4
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block4:
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%DEAD = load i32, i32* %p
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ret i32 %DEAD
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}
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; CHECK: define i32 @main(i32* %p, i32 %x, i32 %y) {
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; CHECK-NEXT: block1:
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; CHECK-NOT: %z = load i32, i32* %p
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; CHECK-NEXT: %cmp = icmp eq i32 %x, %y
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; CHECK-NEXT: br i1 %cmp, label %block2, label %block3
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; CHECK: block2:
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; CHECK-NEXT: %DEAD.pre = load i32, i32* %p
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; CHECK-NEXT: br label %block4
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; CHECK: block3:
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; CHECK-NEXT: store i32 0, i32* %p
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; CHECK-NEXT: br label %block4
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; CHECK: block4:
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; CHECK-NEXT: %DEAD = phi i32 [ 0, %block3 ], [ %DEAD.pre, %block2 ]
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; CHECK-NEXT: ret i32 %DEAD
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; CHECK-NEXT: }
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