1 files changed, 59 insertions, 0 deletions
diff --git a/test/CodeGen/ARM/vext.ll b/test/CodeGen/ARM/vext.ll
index e460a84f6265..55abefef0fa7 100644
--- a/test/CodeGen/ARM/vext.ll
+++ b/test/CodeGen/ARM/vext.ll
@@ -74,3 +74,62 @@ define <16 x i8> @test_vextRq_undef(<16 x i8>* %A, <16 x i8>* %B) nounwind {
 	ret <16 x i8> %tmp3
 }
 
+; Tests for ReconstructShuffle function. Indices have to be carefully
+; chosen to reach lowering phase as a BUILD_VECTOR.
+
+; One vector needs vext, the other can be handled by extract_subvector
+; Also checks interleaving of sources is handled correctly.
+; Essence: a vext is used on %A and something saner than stack load/store for final result.
+define <4 x i16> @test_interleaved(<8 x i16>* %A, <8 x i16>* %B) nounwind {
+;CHECK: test_interleaved:
+;CHECK: vext.16
+;CHECK-NOT: vext.16
+;CHECK: vzip.16
+        %tmp1 = load <8 x i16>* %A
+        %tmp2 = load <8 x i16>* %B
+        %tmp3 = shufflevector <8 x i16> %tmp1, <8 x i16> %tmp2, <4 x i32> <i32 3, i32 8, i32 5, i32 9>
+        ret <4 x i16> %tmp3
+}
+
+; An undef in the shuffle list should still be optimizable
+define <4 x i16> @test_undef(<8 x i16>* %A, <8 x i16>* %B) nounwind {
+;CHECK: test_undef:
+;CHECK: vzip.16
+        %tmp1 = load <8 x i16>* %A
+        %tmp2 = load <8 x i16>* %B
+        %tmp3 = shufflevector <8 x i16> %tmp1, <8 x i16> %tmp2, <4 x i32> <i32 undef, i32 8, i32 5, i32 9>
+        ret <4 x i16> %tmp3
+}
+
+; We should ignore a build_vector with more than two sources.
+; Use illegal <32 x i16> type to produce such a shuffle after legalizing types.
+; Try to look for fallback to stack expansion.
+define <4 x i16> @test_multisource(<32 x i16>* %B) nounwind {
+;CHECK: test_multisource:
+;CHECK: vst1.16
+        %tmp1 = load <32 x i16>* %B
+        %tmp2 = shufflevector <32 x i16> %tmp1, <32 x i16> undef, <4 x i32> <i32 0, i32 8, i32 16, i32 24>
+        ret <4 x i16> %tmp2
+}
+
+; We don't handle shuffles using more than half of a 128-bit vector.
+; Again, test for fallback to stack expansion
+define <4 x i16> @test_largespan(<8 x i16>* %B) nounwind {
+;CHECK: test_largespan:
+;CHECK: vst1.16
+        %tmp1 = load <8 x i16>* %B
+        %tmp2 = shufflevector <8 x i16> %tmp1, <8 x i16> undef, <4 x i32> <i32 0, i32 2, i32 4, i32 6>
+        ret <4 x i16> %tmp2
+}
+
+; The actual shuffle code only handles some cases, make sure we check
+; this rather than blindly emitting a VECTOR_SHUFFLE (infinite
+; lowering loop can result otherwise).
+define <8 x i8> @test_illegal(<16 x i8>* %A, <16 x i8>* %B) nounwind {
+;CHECK: test_illegal:
+;CHECK: vst1.8
+       %tmp1 = load <16 x i8>* %A
+       %tmp2 = load <16 x i8>* %B
+       %tmp3 = shufflevector <16 x i8> %tmp1, <16 x i8> %tmp2, <8 x i32> <i32 0, i32 7, i32 5, i32 25, i32 3, i32 2, i32 2, i32 26>
+       ret <8 x i8> %tmp3
+}