38 lines
1.3 KiB
LLVM
38 lines
1.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; Test to make sure llvm.invariant.start calls are not treated as clobbers.
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; RUN: opt < %s -passes=dse -S | FileCheck %s
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declare ptr @llvm.invariant.start.p0(i64, ptr nocapture) nounwind readonly
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; We could remove either store here. The first store is dead in the
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; conventional sense, because there is a later killing store. The second store
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; is undefined behavior by the semantics of invariant.start, and as such
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; unreachable.
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define void @test(ptr %p) {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: store i8 3, ptr [[P:%.*]], align 4
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; CHECK-NEXT: ret void
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;
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store i8 1, ptr %p, align 4
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%i = call ptr @llvm.invariant.start.p0(i64 1, ptr %p)
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store i8 3, ptr %p, align 4
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ret void
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}
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; FIXME: We should be able to remove the first store to p, even though p and q
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; may alias.
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define void @test2(ptr %p, ptr %q) {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: store i8 1, ptr [[P:%.*]], align 4
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; CHECK-NEXT: store i8 2, ptr [[Q:%.*]], align 4
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; CHECK-NEXT: [[I:%.*]] = call ptr @llvm.invariant.start.p0(i64 1, ptr [[Q]])
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; CHECK-NEXT: store i8 3, ptr [[P]], align 4
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; CHECK-NEXT: ret void
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;
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store i8 1, ptr %p, align 4
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store i8 2, ptr %q, align 4
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%i = call ptr @llvm.invariant.start.p0(i64 1, ptr %q)
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store i8 3, ptr %p, align 4
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ret void
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}
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