1 files changed, 27 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/AMDGPU/build-vector-insert-elt-infloop.ll b/llvm/test/CodeGen/AMDGPU/build-vector-insert-elt-infloop.ll
new file mode 100644
index 00000000000..865dccb2791
--- /dev/null
+++ b/llvm/test/CodeGen/AMDGPU/build-vector-insert-elt-infloop.ll
@@ -0,0 +1,27 @@
+; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -verify-machineinstrs < %s | FileCheck -check-prefix=GCN %s
+
+; There was an infinite loop in DAGCombiner from a target build_vector
+; combine and a generic insert_vector_elt combine.
+
+; GCN-LABEL: {{^}}combine_loop:
+; GCN: flat_load_ushort
+; GCN: flat_store_short
+; GCN: v_lshlrev_b32_e32 v{{[0-9]+}}, 16,
+define amdgpu_kernel void @combine_loop(i16* %arg) #0 {
+bb:
+  br label %bb1
+
+bb1:
+  %tmp = phi <2 x i16> [ <i16 15360, i16 15360>, %bb ], [ %tmp5, %bb1 ]
+  %tmp2 = phi half [ 0xH0000, %bb ], [ %tmp8, %bb1 ]
+  %tmp3 = load volatile half, half* null, align 536870912
+  %tmp4 = bitcast half %tmp3 to i16
+  %tmp5 = insertelement <2 x i16> <i16 0, i16 undef>, i16 %tmp4, i32 1
+  %tmp6 = bitcast i16* %arg to half*
+  store half %tmp2, half* %tmp6, align 2
+  %tmp7 = bitcast <2 x i16> %tmp to <2 x half>
+  %tmp8 = extractelement <2 x half> %tmp7, i32 0
+  br label %bb1
+}
+
+attributes #0 = { nounwind }