1 files changed, 45 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/Hexagon/swp-phi-ref.ll b/llvm/test/CodeGen/Hexagon/swp-phi-ref.ll
new file mode 100644
index 00000000000..1b6def17bd9
--- /dev/null
+++ b/llvm/test/CodeGen/Hexagon/swp-phi-ref.ll
@@ -0,0 +1,45 @@
+; RUN: llc -march=hexagon -enable-pipeliner -enable-bsb-sched=0 -join-liveintervals=false < %s | FileCheck %s
+
+; Test that we generate the correct Phi values when there is a Phi that
+; references another Phi. We need to examine the other Phi to get the
+; correct value. We need to do this even if we haven't generated the
+; kernel code for the other Phi yet.
+
+; CHECK: [[REG0:(v[0-9]+)]] = [[REG1:(v[0-9]+)]]
+; CHECK: loop0
+; CHECK: [[REG0]] = [[REG1]]
+; CHECK: endloop0
+
+; Function Attrs: nounwind
+define void @f0() #0 {
+b0:
+  br i1 undef, label %b1, label %b2
+
+b1:                                               ; preds = %b1, %b0
+  %v0 = phi i32 [ %v7, %b1 ], [ 0, %b0 ]
+  %v1 = phi <16 x i32> [ %v4, %b1 ], [ undef, %b0 ]
+  %v2 = phi <16 x i32> [ %v1, %b1 ], [ undef, %b0 ]
+  %v3 = tail call <16 x i32> @llvm.hexagon.V6.valignb(<16 x i32> %v1, <16 x i32> %v2, i32 62)
+  %v4 = tail call <16 x i32> @llvm.hexagon.V6.vaddh(<16 x i32> undef, <16 x i32> undef)
+  %v5 = tail call <16 x i32> @llvm.hexagon.V6.valignb(<16 x i32> %v4, <16 x i32> %v1, i32 2)
+  %v6 = tail call <16 x i32> @llvm.hexagon.V6.vabsdiffh(<16 x i32> %v3, <16 x i32> %v5)
+  store <16 x i32> %v6, <16 x i32>* null, align 64
+  %v7 = add nsw i32 %v0, 1
+  %v8 = icmp slt i32 %v7, undef
+  br i1 %v8, label %b1, label %b2
+
+b2:                                               ; preds = %b1, %b0
+  ret void
+}
+
+; Function Attrs: nounwind readnone
+declare <16 x i32> @llvm.hexagon.V6.vaddh(<16 x i32>, <16 x i32>) #1
+
+; Function Attrs: nounwind readnone
+declare <16 x i32> @llvm.hexagon.V6.valignb(<16 x i32>, <16 x i32>, i32) #1
+
+; Function Attrs: nounwind readnone
+declare <16 x i32> @llvm.hexagon.V6.vabsdiffh(<16 x i32>, <16 x i32>) #1
+
+attributes #0 = { nounwind "target-cpu"="hexagonv60" "target-features"="+hvxv60,+hvx-length64b" }
+attributes #1 = { nounwind readnone }