39 lines
1.0 KiB
LLVM
39 lines
1.0 KiB
LLVM
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; RUN: opt < %s -gvn -S | FileCheck %s
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; loop.then is not reachable from loop, so we should be able to deduce that the
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; store through %phi2 cannot alias %ptr1.
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; CHECK-LABEL: @test1
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define void @test1(i32* %ptr1, i32* %ptr2) {
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; CHECK-LABEL: entry:
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; CHECK: %[[GEP:.*]] = getelementptr inbounds i32, i32* %ptr1, i64 1
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; CHECK: %[[VAL1:.*]] = load i32, i32* %[[GEP]]
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entry:
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br label %loop.preheader
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loop.preheader:
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%gep1 = getelementptr inbounds i32, i32* %ptr1, i64 1
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br label %loop
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; CHECK-LABEL: loop:
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; CHECK-NOT: load
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loop:
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%phi1 = phi i32* [ %gep1, %loop.preheader ], [ %phi2, %loop.then ]
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%val1 = load i32, i32* %phi1
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br i1 false, label %loop.then, label %loop.if
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loop.if:
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%gep2 = getelementptr inbounds i32, i32* %gep1, i64 1
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%val2 = load i32, i32* %gep2
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%cmp = icmp slt i32 %val1, %val2
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br label %loop.then
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; CHECK-LABEL: loop.then
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; CHECK: store i32 %[[VAL1]], i32* %phi2
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loop.then:
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%phi2 = phi i32* [ %ptr2, %loop ], [ %gep2, %loop.if ]
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store i32 %val1, i32* %phi2
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store i32 0, i32* %ptr1
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br label %loop
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}
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