| ; RUN: opt -loop-accesses -analyze -enable-new-pm=0 < %s | FileCheck %s |
| ; RUN: opt -passes='require<scalar-evolution>,require<aa>,loop(print-access-info)' -disable-output < %s 2>&1 | FileCheck %s |
| |
| ; Analyze this loop: |
| ; for (i = 0; i < n; i++) |
| ; A[i + 4] = A[i] * 2; |
| |
| ; CHECK: Memory dependences are safe with a maximum dependence distance of 8 bytes |
| |
| target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" |
| target triple = "x86_64-apple-macosx10.10.0" |
| |
| @A = common global i16* null, align 8 |
| |
| define void @f() { |
| entry: |
| %a = load i16*, i16** @A, align 8 |
| br label %for.body |
| |
| for.body: ; preds = %for.body, %entry |
| %ind = phi i64 [ 0, %entry ], [ %add, %for.body ] |
| |
| %arrayidxA = getelementptr inbounds i16, i16* %a, i64 %ind |
| %loadA = load i16, i16* %arrayidxA, align 2 |
| |
| %mul = mul i16 %loadA, 2 |
| |
| %next = add nuw nsw i64 %ind, 4 |
| %arrayidxA_next = getelementptr inbounds i16, i16* %a, i64 %next |
| store i16 %mul, i16* %arrayidxA_next, align 2 |
| |
| %add = add nuw nsw i64 %ind, 1 |
| %exitcond = icmp eq i64 %add, 20 |
| br i1 %exitcond, label %for.end, label %for.body |
| |
| for.end: ; preds = %for.body |
| ret void |
| } |