1; RUN: opt -loop-accesses -analyze < %s | FileCheck %s 2; RUN: opt -passes='require<scalar-evolution>,require<aa>,loop(print-access-info)' -disable-output < %s 2>&1 | FileCheck %s 3 4; Analyze this loop: 5; for (i = 0; i < n; i++) 6; A[i + 1] = A[i] * 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: Report: unsafe dependent memory operations in loop 12; CHECK-NEXT: Dependences: 13; CHECK-NEXT: Backward: 14; CHECK-NEXT: %loadA = load i16, i16* %arrayidxA, align 2 -> 15; CHECK-NEXT: store i16 %mul1, i16* %arrayidxA_plus_2, align 2 16; CHECK: Run-time memory checks: 17; CHECK-NEXT: 0: 18; CHECK-NEXT: Comparing group 19; CHECK-NEXT: %arrayidxA = getelementptr inbounds i16, i16* %a, i64 %storemerge3 20; CHECK-NEXT: %arrayidxA_plus_2 = getelementptr inbounds i16, i16* %a, i64 %add 21; CHECK-NEXT: Against group 22; CHECK-NEXT: %arrayidxB = getelementptr inbounds i16, i16* %b, i64 %storemerge3 23; CHECK-NEXT: 1: 24; CHECK-NEXT: Comparing group 25; CHECK-NEXT: %arrayidxA = getelementptr inbounds i16, i16* %a, i64 %storemerge3 26; CHECK-NEXT: %arrayidxA_plus_2 = getelementptr inbounds i16, i16* %a, i64 %add 27; CHECK-NEXT: Against group 28; CHECK-NEXT: %arrayidxC = getelementptr inbounds i16, i16* %c, i64 %storemerge3 29 30@B = common global i16* null, align 8 31@A = common global i16* null, align 8 32@C = common global i16* null, align 8 33 34define void @f() { 35entry: 36 %a = load i16*, i16** @A, align 8 37 %b = load i16*, i16** @B, align 8 38 %c = load i16*, i16** @C, align 8 39 br label %for.body 40 41for.body: ; preds = %for.body, %entry 42 %storemerge3 = phi i64 [ 0, %entry ], [ %add, %for.body ] 43 44 %arrayidxA = getelementptr inbounds i16, i16* %a, i64 %storemerge3 45 %loadA = load i16, i16* %arrayidxA, align 2 46 47 %arrayidxB = getelementptr inbounds i16, i16* %b, i64 %storemerge3 48 %loadB = load i16, i16* %arrayidxB, align 2 49 50 %arrayidxC = getelementptr inbounds i16, i16* %c, i64 %storemerge3 51 %loadC = load i16, i16* %arrayidxC, align 2 52 53 %mul = mul i16 %loadB, %loadA 54 %mul1 = mul i16 %mul, %loadC 55 56 %add = add nuw nsw i64 %storemerge3, 1 57 %arrayidxA_plus_2 = getelementptr inbounds i16, i16* %a, i64 %add 58 store i16 %mul1, i16* %arrayidxA_plus_2, align 2 59 60 %exitcond = icmp eq i64 %add, 20 61 br i1 %exitcond, label %for.end, label %for.body 62 63for.end: ; preds = %for.body 64 ret void 65} 66