[LAA] Include MaxSafeDepDistBytes in the analysis print-out

llvm-svn: 269508

1 files changed, 37 insertions, 0 deletions

diff --git a/llvm/test/Analysis/LoopAccessAnalysis/safe-with-dep-distance.ll b/llvm/test/Analysis/LoopAccessAnalysis/safe-with-dep-distance.ll
new file mode 100644
index 00000000000..b3a82ff1be4
--- /dev/null
+++ b/llvm/test/Analysis/LoopAccessAnalysis/safe-with-dep-distance.ll
@@ -0,0 +1,37 @@
+; RUN: opt -loop-accesses -analyze < %s | 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
+}