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[LoopAccesses] If shouldRetryWithRuntimeCheck, reset InterestingDependences
When dependence analysis encounters a non-constant distance between memory accesses it aborts the analysis and falls back to run-time checks only. In this case we weren't resetting the array of dependences. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237574 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -225,6 +225,8 @@ public:
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return RecordInterestingDependences ? &InterestingDependences : nullptr;
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}
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void clearInterestingDependences() { InterestingDependences.clear(); }
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/// \brief The vector of memory access instructions. The indices are used as
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/// instruction identifiers in the Dependence class.
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const SmallVectorImpl<Instruction *> &getMemoryInstructions() const {
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@ -235,7 +235,12 @@ public:
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bool isRTCheckNeeded() { return IsRTCheckNeeded; }
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bool isDependencyCheckNeeded() { return !CheckDeps.empty(); }
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void resetDepChecks() { CheckDeps.clear(); }
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/// We decided that no dependence analysis would be used. Reset the state.
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void resetDepChecks(MemoryDepChecker &DepChecker) {
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CheckDeps.clear();
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DepChecker.clearInterestingDependences();
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}
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MemAccessInfoSet &getDependenciesToCheck() { return CheckDeps; }
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@ -1161,7 +1166,7 @@ void LoopAccessInfo::analyzeLoop(const ValueToValueMap &Strides) {
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NeedRTCheck = true;
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// Clear the dependency checks. We assume they are not needed.
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Accesses.resetDepChecks();
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Accesses.resetDepChecks(DepChecker);
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PtrRtCheck.reset();
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PtrRtCheck.Need = true;
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57
test/Analysis/LoopAccessAnalysis/resort-to-memchecks-only.ll
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57
test/Analysis/LoopAccessAnalysis/resort-to-memchecks-only.ll
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@ -0,0 +1,57 @@
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; RUN: opt -loop-accesses -analyze < %s | FileCheck %s
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; We give up analyzing the dependences in this loop due to non-constant
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; distance between A[i+offset] and A[i] and add memchecks to prove
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; independence. Make sure that no interesting dependences are reported in
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; this case.
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;
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; for (i = 0; i < n; i++)
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; A[i + offset] = 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: Memory dependences are safe with run-time checks
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; CHECK-NEXT: Interesting Dependences:
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; CHECK-NEXT: Run-time memory checks:
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; CHECK-NEXT: 0:
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; CHECK-NEXT: %arrayidxA2 = getelementptr inbounds i16, i16* %a, i64 %idx
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; CHECK-NEXT: %arrayidxA = getelementptr inbounds i16, i16* %a, i64 %indvar
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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(i64 %offset) {
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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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%indvar = phi i64 [ 0, %entry ], [ %add, %for.body ]
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%arrayidxA = getelementptr inbounds i16, i16* %a, i64 %indvar
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%loadA = load i16, i16* %arrayidxA, align 2
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%arrayidxB = getelementptr inbounds i16, i16* %b, i64 %indvar
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%loadB = load i16, i16* %arrayidxB, align 2
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%arrayidxC = getelementptr inbounds i16, i16* %c, i64 %indvar
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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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%idx = add i64 %indvar, %offset
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%arrayidxA2 = getelementptr inbounds i16, i16* %a, i64 %idx
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store i16 %mul1, i16* %arrayidxA2, align 2
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%add = add nuw nsw i64 %indvar, 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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