1 ; RUN: opt -loop-accesses -analyze < %s | FileCheck %s
3 ; In this loop just because we access A through different types (int, float)
4 ; we still have a dependence cycle:
6 ; for (i = 0; i < n; i++) {
7 ; A_float = (float *) A;
8 ; A_float[i + 1] = A[i] * B[i];
11 target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
12 target triple = "x86_64-apple-macosx10.10.0"
14 ; CHECK: Report: unsafe dependent memory operations in loop
15 ; CHECK-NOT: Memory dependences are safe
17 @B = common global i32* null, align 8
18 @A = common global i32* null, align 8
22 %a = load i32*, i32** @A, align 8
23 %b = load i32*, i32** @B, align 8
26 for.body: ; preds = %for.body, %entry
27 %storemerge3 = phi i64 [ 0, %entry ], [ %add, %for.body ]
29 %arrayidxA = getelementptr inbounds i32, i32* %a, i64 %storemerge3
30 %loadA = load i32, i32* %arrayidxA, align 2
32 %arrayidxB = getelementptr inbounds i32, i32* %b, i64 %storemerge3
33 %loadB = load i32, i32* %arrayidxB, align 2
35 %mul = mul i32 %loadB, %loadA
37 %add = add nuw nsw i64 %storemerge3, 1
39 %a_float = bitcast i32* %a to float*
40 %arrayidxA_plus_2 = getelementptr inbounds float, float* %a_float, i64 %add
41 %mul_float = sitofp i32 %mul to float
42 store float %mul_float, float* %arrayidxA_plus_2, align 2
44 %exitcond = icmp eq i64 %add, 20
45 br i1 %exitcond, label %for.end, label %for.body
47 for.end: ; preds = %for.body