1; RUN: opt -basicaa -loop-accesses -analyze < %s | FileCheck %s 2; RUN: opt -passes='require<aa>,require<scalar-evolution>,require<aa>,loop(print-access-info)' -aa-pipeline='basic-aa' -disable-output < %s 2>&1 | FileCheck %s 3 4; If the arrays don't alias this loop is safe with no memchecks: 5; for (i = 0; i < n; i++) 6; A[i] = A[i+1] * B[i] * C[i]; 7 8target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" 9target triple = "x86_64-apple-macosx10.10.0" 10 11; Check the loop-carried forward anti-dep between the load of A[i+1] and the 12; store of A[i]; 13 14; CHECK: Memory dependences are safe{{$}} 15; CHECK-NEXT: Dependences: 16; CHECK-NEXT: Forward: 17; CHECK-NEXT: %loadA_plus_2 = load i16, i16* %arrayidxA_plus_2, align 2 -> 18; CHECK-NEXT: store i16 %mul1, i16* %arrayidxA, align 2 19 20 21define void @f(i16* noalias %a, 22 i16* noalias %b, 23 i16* noalias %c) { 24entry: 25 br label %for.body 26 27for.body: ; preds = %for.body, %entry 28 %ind = phi i64 [ 0, %entry ], [ %add, %for.body ] 29 30 %add = add nuw nsw i64 %ind, 1 31 32 %arrayidxA_plus_2 = getelementptr inbounds i16, i16* %a, i64 %add 33 %loadA_plus_2 = load i16, i16* %arrayidxA_plus_2, align 2 34 35 %arrayidxB = getelementptr inbounds i16, i16* %b, i64 %ind 36 %loadB = load i16, i16* %arrayidxB, align 2 37 38 %arrayidxC = getelementptr inbounds i16, i16* %c, i64 %ind 39 %loadC = load i16, i16* %arrayidxC, align 2 40 41 %mul = mul i16 %loadB, %loadA_plus_2 42 %mul1 = mul i16 %mul, %loadC 43 44 %arrayidxA = getelementptr inbounds i16, i16* %a, i64 %ind 45 store i16 %mul1, i16* %arrayidxA, align 2 46 47 %exitcond = icmp eq i64 %add, 20 48 br i1 %exitcond, label %for.end, label %for.body 49 50for.end: ; preds = %for.body 51 ret void 52} 53