Re-add tests from r179291 which were accidentally removed by r181177.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190934 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/InstCombine/vec_shuffle.ll b/test/Transforms/InstCombine/vec_shuffle.ll
index 738e05b519d2cb83eaa68d757fa4735ff3be8a2b..3ee43dc63a6f4d7d8244950145ada2338fd44d3e 100644 (file)
--- a/test/Transforms/InstCombine/vec_shuffle.ll
+++ b/test/Transforms/InstCombine/vec_shuffle.ll
@@ -200,3 +200,31 @@ define void @test14(i16 %conv10) {
   %sext = sext <2 x i1> %cmp to <2 x i16>
   ret void
 }
+
+; Check that sequences of insert/extract element are 
+; collapsed into valid shuffle instruction with correct shuffle indexes.
+ 
+define <4 x float> @test15a(<4 x float> %LHS, <4 x float> %RHS) {
+; CHECK-LABEL: @test15a
+; CHECK-NEXT: shufflevector <4 x float> %LHS, <4 x float> %RHS, <4 x i32> <i32 4, i32 0, i32 6, i32 6>
+; CHECK-NEXT: ret <4 x float> %tmp4
+  %tmp1 = extractelement <4 x float> %LHS, i32 0
+  %tmp2 = insertelement <4 x float> %RHS, float %tmp1, i32 1
+  %tmp3 = extractelement <4 x float> %RHS, i32 2
+  %tmp4 = insertelement <4 x float> %tmp2, float %tmp3, i32 3
+  ret <4 x float> %tmp4
+}
+ 
+define <4 x float> @test15b(<4 x float> %LHS, <4 x float> %RHS) {
+; CHECK-LABEL: @test15b
+; CHECK-NEXT: shufflevector <4 x float> %LHS, <4 x float> %RHS, <4 x i32> <i32 4, i32 3, i32 6, i32 6>
+; CHECK-NEXT: ret <4 x float> %tmp5
+  %tmp0 = extractelement <4 x float> %LHS, i32 3
+  %tmp1 = insertelement <4 x float> %RHS, float %tmp0, i32 0
+  %tmp2 = extractelement <4 x float> %tmp1, i32 0
+  %tmp3 = insertelement <4 x float> %RHS, float %tmp2, i32 1
+  %tmp4 = extractelement <4 x float> %RHS, i32 2
+  %tmp5 = insertelement <4 x float> %tmp3, float %tmp4, i32 3
+  ret <4 x float> %tmp5
+}
+