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7a6f54545f
This commit ([LAA] Fix estimation of number of memchecks) regressed the logic a bit. We shouldn't quit the analysis if we encounter a pointer without known bounds *unless* we actually need to emit a memcheck for it. The original code was using NumComparisons which is now computed differently. Instead I compute NeedRTCheck from NumReadPtrChecks and NumWritePtrChecks. As side note, I find the separation of NeedRTCheck and CanDoRT confusing, so I will try to merge them in a follow-up patch. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241756 91177308-0d34-0410-b5e6-96231b3b80d8
43 lines
1.3 KiB
LLVM
43 lines
1.3 KiB
LLVM
; RUN: opt -loop-accesses -analyze < %s | FileCheck %s
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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; We shouldn't quit the analysis if we encounter a pointer without known
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; bounds *unless* we actually need to emit a memcheck for it. (We only
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; compute bounds for SCEVAddRecs so A[i*I] is deemed not having known bounds.)
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;
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; for (i = 0; i < 20; ++i)
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; A[i*i] *= 2;
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; CHECK: for.body:
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; CHECK: Report: unsafe dependent memory operations in loop
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; CHECK-NOT: Report: cannot identify array bounds
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; CHECK: Interesting Dependences:
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; CHECK: Unknown:
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; CHECK: %loadA = load i16, i16* %arrayidxA, align 2 ->
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; CHECK: store i16 %mul, i16* %arrayidxA, align 2
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define void @f(i16* %a) {
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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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%access_ind = mul i64 %ind, %ind
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%arrayidxA = getelementptr inbounds i16, i16* %a, i64 %access_ind
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%loadA = load i16, i16* %arrayidxA, align 2
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%mul = mul i16 %loadA, 2
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store i16 %mul, i16* %arrayidxA, align 2
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%add = add nuw nsw i64 %ind, 1
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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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