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