1 files changed, 76 insertions, 0 deletions
diff --git a/llvm/test/Transforms/LoopDistribute/basic.ll b/llvm/test/Transforms/LoopDistribute/basic.ll
index 97296c2d123..0d7b6f21824 100644
--- a/llvm/test/Transforms/LoopDistribute/basic.ll
+++ b/llvm/test/Transforms/LoopDistribute/basic.ll
@@ -18,6 +18,7 @@
 target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
 target triple = "x86_64-apple-macosx10.10.0"
 
+; CHECK-LABEL: @f(
 define void @f(i32* noalias %a,
                i32* noalias %b,
                i32* noalias %c,
@@ -81,3 +82,78 @@ for.body:                                         ; preds = %for.body, %entry
 for.end:                                          ; preds = %for.body
   ret void
 }
+
+declare i32 @llvm.convergent(i32) #0
+
+; It is OK to distribute with a convergent operation, since in each
+; new loop the convergent operation has the ssame control dependency.
+; CHECK-LABEL: @f_with_convergent(
+define void @f_with_convergent(i32* noalias %a,
+                               i32* noalias %b,
+                               i32* noalias %c,
+                               i32* noalias %d,
+                               i32* noalias %e) {
+entry:
+  br label %for.body
+
+; Verify the two distributed loops.
+
+; CHECK: entry.split.ldist1:
+; CHECK:    br label %for.body.ldist1
+; CHECK: for.body.ldist1:
+; CHECK:    %mulA.ldist1 = mul i32 %loadB.ldist1, %loadA.ldist1
+; CHECK:    br i1 %exitcond.ldist1, label %entry.split, label %for.body.ldist1
+
+; CHECK: entry.split:
+; CHECK:    br label %for.body
+; CHECK: for.body:
+; CHECK:    %convergentD = call i32 @llvm.convergent(i32 %loadD)
+; CHECK:    %mulC = mul i32 %convergentD, %loadE
+; CHECK: for.end:
+
+
+; ANALYSIS: for.body:
+; ANALYSIS-NEXT: Has convergent operation in loop
+; ANALYSIS-NEXT: Report: cannot add control dependency to convergent operation
+; ANALYSIS: for.body.ldist1:
+; ANALYSIS-NEXT: Report: unsafe dependent memory operations in loop
+
+; convergent instruction happens to block vectorization
+; VECTORIZE: call i32 @llvm.convergent
+; VECTORIZE: mul i32
+
+for.body:                                         ; preds = %for.body, %entry
+  %ind = phi i64 [ 0, %entry ], [ %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
+
+  %arrayidxD = getelementptr inbounds i32, i32* %d, i64 %ind
+  %loadD = load i32, i32* %arrayidxD, align 4
+
+  %arrayidxE = getelementptr inbounds i32, i32* %e, i64 %ind
+  %loadE = load i32, i32* %arrayidxE, align 4
+
+  %convergentD = call i32 @llvm.convergent(i32 %loadD)
+  %mulC = mul i32 %convergentD, %loadE
+
+  %arrayidxC = getelementptr inbounds i32, i32* %c, i64 %ind
+  store i32 %mulC, i32* %arrayidxC, align 4
+
+  %exitcond = icmp eq i64 %add, 20
+  br i1 %exitcond, label %for.end, label %for.body
+
+for.end:                                          ; preds = %for.body
+  ret void
+}
+
+attributes #0 = { nounwind readnone convergent }