derek.holloway
7502bf64a4
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35 lines
1008 B
LLVM
35 lines
1008 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -passes=dse < %s | FileCheck %s
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; Assume that %p1 != %p2 if and only if %c is true. In that case the noalias
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; metadata is correct, but the first store cannot be eliminated, as it may be
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; read-clobbered by the load.
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define void @test(i1 %c, ptr %p1, ptr %p2) {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: store i8 0, ptr [[P1:%.*]], align 1
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; CHECK-NEXT: [[TMP1:%.*]] = load i8, ptr [[P2:%.*]], align 1, !alias.scope !0
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; CHECK-NEXT: br i1 [[C:%.*]], label [[IF:%.*]], label [[ELSE:%.*]]
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; CHECK: if:
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; CHECK-NEXT: store i8 1, ptr [[P1]], align 1, !noalias !0
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; CHECK-NEXT: ret void
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; CHECK: else:
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; CHECK-NEXT: store i8 2, ptr [[P1]], align 1
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; CHECK-NEXT: ret void
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;
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store i8 0, ptr %p1
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load i8, ptr %p2, !alias.scope !2
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br i1 %c, label %if, label %else
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if:
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store i8 1, ptr %p1, !noalias !2
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ret void
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else:
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store i8 2, ptr %p1
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ret void
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}
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!0 = !{!0}
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!1 = !{!1, !0}
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!2 = !{!1}
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