1 files changed, 67 insertions, 0 deletions
diff --git a/test/CodeGen/Hexagon/hwloop-wrap2.ll b/test/CodeGen/Hexagon/hwloop-wrap2.ll
new file mode 100644
index 000000000000..50675d6b681b
--- /dev/null
+++ b/test/CodeGen/Hexagon/hwloop-wrap2.ll
@@ -0,0 +1,67 @@
+; RUN: llc -march=hexagon -mcpu=hexagonv5 -O3 < %s | FileCheck %s
+
+; Test that we do not generate a hardware loop due to a potential underflow.
+
+; CHECK-NOT: loop0
+
+%struct.3 = type { i8*, i8, i8, i32, i32, i16, i16, i16, i16, i16, i16, i16, %struct.2* }
+%struct.2 = type { i16, i16, i16, i16, %struct.1* }
+%struct.1 = type { %struct.1*, %struct.0*, i32, i32, i16, [2 x i16], [2 x i16], i16 }
+%struct.0 = type { %struct.0*, i32, i32, i32, i32, i32, i32, i16, i16, i16, i8, i8, i8, i8 }
+
+@pairArray = external global i32**
+@carray = external global %struct.3**
+
+define void @test() #0 {
+entry:
+  %0 = load i32**, i32*** @pairArray, align 4
+  %1 = load %struct.3**, %struct.3*** @carray, align 4
+  br i1 undef, label %for.end110, label %for.body
+
+for.body:
+  %row.0199 = phi i32 [ %inc109, %for.inc108 ], [ 1, %entry ]
+  %arrayidx = getelementptr inbounds i32*, i32** %0, i32 %row.0199
+  %2 = load i32*, i32** %arrayidx, align 4
+  br i1 undef, label %for.body48, label %for.inc108
+
+for.cond45:
+  %cmp46 = icmp sgt i32 %dec58, 0
+  br i1 %cmp46, label %for.body48, label %for.inc108
+
+for.body48:
+  %i.1190 = phi i32 [ %dec58, %for.cond45 ], [ 0, %for.body ]
+  %arrayidx50 = getelementptr inbounds i32, i32* %2, i32 %i.1190
+  %3 = load i32, i32* %arrayidx50, align 4
+  %cmp53 = icmp slt i32 %3, 0
+  %dec58 = add nsw i32 %i.1190, -1
+  br i1 %cmp53, label %for.end59, label %for.cond45
+
+for.end59:
+  %cmp60 = icmp slt i32 %i.1190, 0
+  br i1 %cmp60, label %if.then65, label %for.inc108
+
+if.then65:
+  br label %for.body80
+
+for.body80:
+  %j.1196.in = phi i32 [ %j.1196, %for.body80 ], [ %i.1190, %if.then65 ]
+  %j.1196 = add nsw i32 %j.1196.in, 1
+  %arrayidx81 = getelementptr inbounds i32, i32* %2, i32 %j.1196
+  %4 = load i32, i32* %arrayidx81, align 4
+  %arrayidx82 = getelementptr inbounds %struct.3*, %struct.3** %1, i32 %4
+  %5 = load %struct.3*, %struct.3** %arrayidx82, align 4
+  %cxcenter83 = getelementptr inbounds %struct.3, %struct.3* %5, i32 0, i32 3
+  store i32 0, i32* %cxcenter83, align 4
+  %6 = load i32, i32* %arrayidx81, align 4
+  %arrayidx87 = getelementptr inbounds i32, i32* %2, i32 %j.1196.in
+  store i32 %6, i32* %arrayidx87, align 4
+  %exitcond = icmp eq i32 %j.1196, 0
+  br i1 %exitcond, label %for.inc108, label %for.body80
+
+for.inc108:
+  %inc109 = add nsw i32 %row.0199, 1
+  br i1 undef, label %for.body, label %for.end110
+
+for.end110:
+  ret void
+}