forked from OSchip/llvm-project
66 lines
2.3 KiB
LLVM
66 lines
2.3 KiB
LLVM
; RUN: opt -passes='print-access-info' -disable-output < %s 2>&1 | FileCheck %s
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; Analyze this loop:
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; for (i = 0; i < n; i++)
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; A[i + 1] = A[i] * B[i] * C[i];
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.10.0"
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; CHECK: Report: unsafe dependent memory operations in loop
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; CHECK-NEXT: Backward loop carried data dependence.
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; CHECK-NEXT: Dependences:
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; CHECK-NEXT: Backward:
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; CHECK-NEXT: %loadA = load i16, i16* %arrayidxA, align 2 ->
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; CHECK-NEXT: store i16 %mul1, i16* %arrayidxA_plus_2, align 2
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; CHECK: Run-time memory checks:
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; CHECK-NEXT: 0:
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; CHECK-NEXT: Comparing group
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; CHECK-NEXT: %arrayidxA = getelementptr inbounds i16, i16* %a, i64 %storemerge3
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; CHECK-NEXT: %arrayidxA_plus_2 = getelementptr inbounds i16, i16* %a, i64 %add
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; CHECK-NEXT: Against group
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; CHECK-NEXT: %arrayidxB = getelementptr inbounds i16, i16* %b, i64 %storemerge3
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; CHECK-NEXT: 1:
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; CHECK-NEXT: Comparing group
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; CHECK-NEXT: %arrayidxA = getelementptr inbounds i16, i16* %a, i64 %storemerge3
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; CHECK-NEXT: %arrayidxA_plus_2 = getelementptr inbounds i16, i16* %a, i64 %add
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; CHECK-NEXT: Against group
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; CHECK-NEXT: %arrayidxC = getelementptr inbounds i16, i16* %c, i64 %storemerge3
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@B = common global i16* null, align 8
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@A = common global i16* null, align 8
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@C = common global i16* null, align 8
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define void @f() {
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entry:
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%a = load i16*, i16** @A, align 8
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%b = load i16*, i16** @B, align 8
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%c = load i16*, i16** @C, align 8
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br label %for.body
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for.body: ; preds = %for.body, %entry
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%storemerge3 = phi i64 [ 0, %entry ], [ %add, %for.body ]
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%arrayidxA = getelementptr inbounds i16, i16* %a, i64 %storemerge3
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%loadA = load i16, i16* %arrayidxA, align 2
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%arrayidxB = getelementptr inbounds i16, i16* %b, i64 %storemerge3
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%loadB = load i16, i16* %arrayidxB, align 2
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%arrayidxC = getelementptr inbounds i16, i16* %c, i64 %storemerge3
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%loadC = load i16, i16* %arrayidxC, align 2
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%mul = mul i16 %loadB, %loadA
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%mul1 = mul i16 %mul, %loadC
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%add = add nuw nsw i64 %storemerge3, 1
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%arrayidxA_plus_2 = getelementptr inbounds i16, i16* %a, i64 %add
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store i16 %mul1, i16* %arrayidxA_plus_2, align 2
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%exitcond = icmp eq i64 %add, 20
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body
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ret void
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}
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