54 lines
1.9 KiB
LLVM
54 lines
1.9 KiB
LLVM
; RUN: opt -instcombine -S < %s | FileCheck %s
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;
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; Verify that instcombine preserves TBAA tags when converting a memcpy into
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; a scalar load and store.
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i1) nounwind
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%A = type { float }
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define void @test1(%A* %a1, %A* %a2) {
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entry:
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; CHECK-LABEL: @test1
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; CHECK: %[[LOAD:.*]] = load i32, {{.*}}, !tbaa [[TAG_A:!.*]]
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; CHECK: store i32 %[[LOAD]], {{.*}}, !tbaa [[TAG_A]]
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; CHECK: ret
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%0 = bitcast %A* %a1 to i8*
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%1 = bitcast %A* %a2 to i8*
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tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 %0, i8* align 4 %1, i64 4, i1 false), !tbaa !4 ; TAG_A
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ret void
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}
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%B = type { i32 (i8*, i32*, double*)** }
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define i32 (i8*, i32*, double*)*** @test2() {
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; CHECK-LABEL: @test2
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; CHECK-NOT: memcpy
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; CHECK: ret
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%tmp = alloca %B, align 8
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%tmp1 = bitcast %B* %tmp to i8*
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 8 %tmp1, i8* align 8 undef, i64 8, i1 false), !tbaa !7 ; TAG_B
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%tmp2 = getelementptr %B, %B* %tmp, i32 0, i32 0
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%tmp3 = load i32 (i8*, i32*, double*)**, i32 (i8*, i32*, double*)*** %tmp2
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ret i32 (i8*, i32*, double*)*** %tmp2
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}
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!0 = !{!"root"}
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!1 = !{!0, !"char"}
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!2 = !{!1, !"float"}
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!3 = !{!1, i64 4, !"A", !2, i64 0, i64 4}
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!4 = !{!3, !3, i64 0, i64 4}
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!5 = !{!1, !"pointer"}
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!6 = !{!1, i64 8, !"B", !5, i64 0, i64 8}
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!7 = !{!6, !6, i64 0, i64 8}
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; CHECK-DAG: [[ROOT:!.*]] = !{!"root"}
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; CHECK-DAG: [[TYPE_char:!.*]] = !{[[ROOT]], !"char"}
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; CHECK-DAG: [[TYPE_float:!.*]] = !{[[TYPE_char]], !"float"}
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; CHECK-DAG: [[TYPE_A:!.*]] = !{[[TYPE_char]], i64 4, !"A", [[TYPE_float]], i64 0, i64 4}
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; CHECK-DAG: [[TAG_A]] = !{[[TYPE_A]], [[TYPE_A]], i64 0, i64 4}
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; Note that the memcpy() call in test2() transforms into an
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; undecorated 'store undef', so TAG_B is not present in the output.
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