1 files changed, 65 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/Hexagon/swp-chain-refs.ll b/llvm/test/CodeGen/Hexagon/swp-chain-refs.ll
new file mode 100644
index 00000000000..d340ff6d0cc
--- /dev/null
+++ b/llvm/test/CodeGen/Hexagon/swp-chain-refs.ll
@@ -0,0 +1,65 @@
+; RUN: llc -march=hexagon -enable-pipeliner=true -stats -o /dev/null < %s \
+; RUN:      2>&1 | FileCheck %s --check-prefix=STATS
+
+; Test that we do not schedule chained references too far apart,
+; which enables the loop to be pipelined. In this test, the loop should
+; not be pipelined when the chained references are constrained correctly.
+
+; STATS-NOT: 1 pipeliner   - Number of loops software pipelined
+
+; Function Attrs: nounwind
+define void @f0() #0 {
+b0:
+  br label %b2
+
+b1:                                               ; preds = %b6
+  br label %b7
+
+b2:                                               ; preds = %b6, %b0
+  br label %b3
+
+b3:                                               ; preds = %b5, %b2
+  br i1 undef, label %b4, label %b5
+
+b4:                                               ; preds = %b3
+  br label %b5
+
+b5:                                               ; preds = %b4, %b3
+  br i1 undef, label %b3, label %b6
+
+b6:                                               ; preds = %b5
+  br i1 undef, label %b1, label %b2
+
+b7:                                               ; preds = %b7, %b1
+  %v0 = phi i32 [ 0, %b1 ], [ %v4, %b7 ]
+  %v1 = load i16, i16* undef, align 8, !tbaa !0
+  %v2 = icmp sgt i16 %v1, undef
+  %v3 = select i1 %v2, i16 4, i16 undef
+  store i16 %v3, i16* undef, align 2, !tbaa !0
+  store i16 -32768, i16* undef, align 2, !tbaa !0
+  %v4 = add i32 %v0, 1
+  %v5 = icmp eq i32 %v4, 5
+  br i1 %v5, label %b8, label %b7
+
+b8:                                               ; preds = %b7
+  br i1 undef, label %b9, label %b10
+
+b9:                                               ; preds = %b8
+  br label %b10
+
+b10:                                              ; preds = %b9, %b8
+  br i1 undef, label %b11, label %b12
+
+b11:                                              ; preds = %b10
+  unreachable
+
+b12:                                              ; preds = %b10
+  ret void
+}
+
+attributes #0 = { nounwind "target-cpu"="hexagonv55" }
+
+!0 = !{!1, !1, i64 0}
+!1 = !{!"short", !2}
+!2 = !{!"omnipotent char", !3}
+!3 = !{!"Simple C/C++ TBAA"}