1 files changed, 69 insertions, 0 deletions
diff --git a/llvm/test/Transforms/LoopDistribute/outside-use.ll b/llvm/test/Transforms/LoopDistribute/outside-use.ll
new file mode 100644
index 00000000000..546050d5b04
--- /dev/null
+++ b/llvm/test/Transforms/LoopDistribute/outside-use.ll
@@ -0,0 +1,69 @@
+; RUN: opt -loop-distribute -verify-loop-info -verify-dom-info -S < %s \
+; RUN:   | FileCheck %s
+
+; Check that definitions used outside the loop are handled correctly: (1) they
+; are not dropped (2) when version the loop, a phi is added to merge the value
+; from the non-distributed loop and the distributed loop.
+;
+;   for (i = 0; i < n; i++) {
+;     A[i + 1] = A[i] * B[i];
+;   ==========================
+;     sum += C[i];
+;   }
+
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx10.10.0"
+
+@B = common global i32* null, align 8
+@A = common global i32* null, align 8
+@C = common global i32* null, align 8
+@D = common global i32* null, align 8
+@E = common global i32* null, align 8
+@SUM = common global i32 0, align 8
+
+define void @f() {
+entry:
+  %a = load i32*, i32** @A, align 8
+  %b = load i32*, i32** @B, align 8
+  %c = load i32*, i32** @C, align 8
+  %d = load i32*, i32** @D, align 8
+  %e = load i32*, i32** @E, align 8
+
+  br label %for.body
+
+; CHECK: for.body.ldist1:
+; CHECK:   %mulA.ldist1 = mul i32 %loadB.ldist1, %loadA.ldist1
+; CHECK: for.body.ph:
+; CHECK: for.body:
+; CHECK:   %sum_add = add nuw nsw i32 %sum, %loadC
+; CHECK: for.end:
+; CHECK:   %sum_add.ldist = phi i32 [ %sum_add, %for.body ], [ %sum_add.ldist.nondist, %for.body.ldist.nondist ]
+
+for.body:                                         ; preds = %for.body, %entry
+  %ind = phi i64 [ 0, %entry ], [ %add, %for.body ]
+  %sum = phi i32 [ 0, %entry ], [ %sum_add, %for.body ]
+
+  %arrayidxA = getelementptr inbounds i32, i32* %a, i64 %ind
+  %loadA = load i32, i32* %arrayidxA, align 4
+
+  %arrayidxB = getelementptr inbounds i32, i32* %b, i64 %ind
+  %loadB = load i32, i32* %arrayidxB, align 4
+
+  %mulA = mul i32 %loadB, %loadA
+
+  %add = add nuw nsw i64 %ind, 1
+  %arrayidxA_plus_4 = getelementptr inbounds i32, i32* %a, i64 %add
+  store i32 %mulA, i32* %arrayidxA_plus_4, align 4
+
+  %arrayidxC = getelementptr inbounds i32, i32* %c, i64 %ind
+  %loadC = load i32, i32* %arrayidxC, align 4
+
+  %sum_add = add nuw nsw i32 %sum, %loadC
+
+  %exitcond = icmp eq i64 %add, 20
+  br i1 %exitcond, label %for.end, label %for.body
+
+for.end:                                          ; preds = %for.body
+  store i32 %sum_add, i32* @SUM, align 4
+  ret void
+}