forked from OSchip/llvm-project
79 lines
2.7 KiB
LLVM
79 lines
2.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -basic-aa -scoped-noalias-aa -memcpyopt -S %s -verify-memoryssa | FileCheck %s
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%T = type { i8, i32 }
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; A global constant of %T
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@C = external constant %T
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; Ensure load-store forwarding of an aggregate is interpreted as
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; a memmove when the source and dest may alias
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define void @test_memmove(%T* align 8 %a, %T* align 16 %b) {
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; CHECK-LABEL: @test_memmove(
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; CHECK-NEXT: [[TMP1:%.*]] = bitcast %T* [[B:%.*]] to i8*
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; CHECK-NEXT: [[TMP2:%.*]] = bitcast %T* [[A:%.*]] to i8*
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; CHECK-NEXT: call void @llvm.memmove.p0i8.p0i8.i64(i8* align 16 [[TMP1]], i8* align 8 [[TMP2]], i64 8, i1 false)
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; CHECK-NEXT: ret void
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;
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%val = load %T, %T* %a, align 8
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store %T %val, %T* %b, align 16
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ret void
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}
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; Ensure load-store forwarding of an aggregate is interpreted as
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; a memcpy when the source and dest do not alias
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define void @test_memcpy(%T* noalias align 8 %a, %T* noalias align 16 %b) {
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; CHECK-LABEL: @test_memcpy(
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; CHECK-NEXT: [[TMP1:%.*]] = bitcast %T* [[B:%.*]] to i8*
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; CHECK-NEXT: [[TMP2:%.*]] = bitcast %T* [[A:%.*]] to i8*
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; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 16 [[TMP1]], i8* align 8 [[TMP2]], i64 8, i1 false)
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; CHECK-NEXT: ret void
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;
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%val = load %T, %T* %a, align 8
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store %T %val, %T* %b, align 16
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ret void
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}
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define void @test_memcpy_constant(%T* %d) {
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; CHECK-LABEL: @test_memcpy_constant(
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; CHECK-NEXT: [[TMP1:%.*]] = bitcast %T* [[D:%.*]] to i8*
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; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 16 [[TMP1]], i8* align 8 getelementptr inbounds ([[T:%.*]], %T* @C, i32 0, i32 0), i64 8, i1 false)
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; CHECK-NEXT: ret void
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;
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%val = load %T, %T* @C, align 8
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store %T %val, %T* %d, align 16
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ret void
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}
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; memcpy(%d, %a) should not be generated since store2 may-aliases load %a.
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define void @f(%T* %a, %T* %b, %T* %c, %T* %d) {
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; CHECK-LABEL: @f(
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; CHECK-NEXT: [[VAL:%.*]] = load [[T:%.*]], %T* [[A:%.*]], align 4, !alias.scope !0
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; CHECK-NEXT: store [[T]] { i8 23, i32 23 }, %T* [[B:%.*]], align 4, !alias.scope !3
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; CHECK-NEXT: store [[T]] { i8 44, i32 44 }, %T* [[C:%.*]], align 4, !alias.scope !6, !noalias !3
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; CHECK-NEXT: store [[T]] [[VAL]], %T* [[D:%.*]], align 4, !alias.scope !9, !noalias !12
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; CHECK-NEXT: ret void
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;
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%val = load %T, %T* %a, !alias.scope !{!10}
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; store1 may-aliases the load
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store %T { i8 23, i32 23 }, %T* %b, !alias.scope !{!11}
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; store2 may-aliases the load and store3
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store %T { i8 44, i32 44 }, %T* %c, !alias.scope !{!12}, !noalias !{!11}
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; store3
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store %T %val, %T* %d, !alias.scope !{!13}, !noalias !{!10, !11}
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ret void
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}
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!0 = !{!0}
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!1 = !{!1}
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!2 = !{!2}
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!3 = !{!3}
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!10 = !{ !10, !0 }
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!11 = !{ !11, !1 }
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!12 = !{ !12, !2 }
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!13 = !{ !13, !3 }
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