diff --git a/lib/Analysis/LoopAccessAnalysis.cpp b/lib/Analysis/LoopAccessAnalysis.cpp index 23429335dea..724c21f18c9 100644 --- a/lib/Analysis/LoopAccessAnalysis.cpp +++ b/lib/Analysis/LoopAccessAnalysis.cpp @@ -1314,10 +1314,10 @@ LoopAccessInfo::LoopAccessInfo(Loop *L, ScalarEvolution *SE, void LoopAccessInfo::print(raw_ostream &OS, unsigned Depth) const { if (CanVecMem) { - if (PtrRtCheck.empty()) - OS.indent(Depth) << "Memory dependences are safe\n"; - else + if (PtrRtCheck.Need) OS.indent(Depth) << "Memory dependences are safe with run-time checks\n"; + else + OS.indent(Depth) << "Memory dependences are safe\n"; } OS.indent(Depth) << "Store to invariant address was " diff --git a/test/Analysis/LoopAccessAnalysis/safe-no-checks.ll b/test/Analysis/LoopAccessAnalysis/safe-no-checks.ll new file mode 100644 index 00000000000..fa70c024a9c --- /dev/null +++ b/test/Analysis/LoopAccessAnalysis/safe-no-checks.ll @@ -0,0 +1,43 @@ +; RUN: opt -basicaa -loop-accesses -analyze < %s | FileCheck %s + +; If the arrays don't alias this loop is safe with no memchecks: +; for (i = 0; i < n; i++) +; A[i] = A[i+1] * B[i] * C[i]; + +target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" +target triple = "x86_64-apple-macosx10.10.0" + +; CHECK: Memory dependences are safe{{$}} + +define void @f(i16* noalias %a, + i16* noalias %b, + i16* noalias %c) { +entry: + br label %for.body + +for.body: ; preds = %for.body, %entry + %ind = phi i64 [ 0, %entry ], [ %add, %for.body ] + + %add = add nuw nsw i64 %ind, 1 + + %arrayidxA_plus_2 = getelementptr inbounds i16, i16* %a, i64 %add + %loadA_plus_2 = load i16, i16* %arrayidxA_plus_2, align 2 + + %arrayidxB = getelementptr inbounds i16, i16* %b, i64 %ind + %loadB = load i16, i16* %arrayidxB, align 2 + + %arrayidxC = getelementptr inbounds i16, i16* %c, i64 %ind + %loadC = load i16, i16* %arrayidxC, align 2 + + %mul = mul i16 %loadB, %loadA_plus_2 + %mul1 = mul i16 %mul, %loadC + + %arrayidxA = getelementptr inbounds i16, i16* %a, i64 %ind + store i16 %mul1, i16* %arrayidxA, align 2 + + %exitcond = icmp eq i64 %add, 20 + br i1 %exitcond, label %for.end, label %for.body + +for.end: ; preds = %for.body + ret void +}