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 8 target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" 9 target 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 34 define void @f() { 35 entry: 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 41 for.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 63 for.end: ; preds = %for.body 64 ret void 65 } 66
