derek.holloway
7502bf64a4
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52 lines
1.6 KiB
LLVM
52 lines
1.6 KiB
LLVM
; RUN: opt -passes='print<access-info>' -aa-pipeline='basic-aa' -disable-output < %s 2>&1 | FileCheck %s
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; If the arrays don't alias this loop is safe with no memchecks:
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; for (i = 0; i < n; i++)
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; A[i] = 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 the loop-carried forward anti-dep between the load of A[i+1] and the
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; store of A[i];
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; CHECK: Memory dependences are safe{{$}}
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; CHECK-NEXT: Dependences:
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; CHECK-NEXT: Forward:
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; CHECK-NEXT: %loadA_plus_2 = load i16, ptr %arrayidxA_plus_2, align 2 ->
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; CHECK-NEXT: store i16 %mul1, ptr %arrayidxA, align 2
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define void @f(ptr noalias %a,
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ptr noalias %b,
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ptr noalias %c) {
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entry:
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br label %for.body
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for.body: ; preds = %for.body, %entry
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%ind = phi i64 [ 0, %entry ], [ %add, %for.body ]
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%add = add nuw nsw i64 %ind, 1
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%arrayidxA_plus_2 = getelementptr inbounds i16, ptr %a, i64 %add
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%loadA_plus_2 = load i16, ptr %arrayidxA_plus_2, align 2
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%arrayidxB = getelementptr inbounds i16, ptr %b, i64 %ind
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%loadB = load i16, ptr %arrayidxB, align 2
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%arrayidxC = getelementptr inbounds i16, ptr %c, i64 %ind
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%loadC = load i16, ptr %arrayidxC, align 2
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%mul = mul i16 %loadB, %loadA_plus_2
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%mul1 = mul i16 %mul, %loadC
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%arrayidxA = getelementptr inbounds i16, ptr %a, i64 %ind
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store i16 %mul1, ptr %arrayidxA, 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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