Legalizer: Add support for splitting insert_subvectors.

We handle this by spilling the whole thing to the stack and doing the
insertion as a store.

PR19492. This happens in real code because the vectorizer creates v2i128 when AVX is enabled.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211435 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 33 insertions, 0 deletions

diff --git a/test/CodeGen/X86/vec_split.ll b/test/CodeGen/X86/vec_split.ll
index f9e7c20ba4..bc2c6633f2 100644
--- a/test/CodeGen/X86/vec_split.ll
+++ b/test/CodeGen/X86/vec_split.ll
@@ -40,3 +40,36 @@ define <32 x i16> @split32(<32 x i16> %a, <32 x i16> %b, <32 x i8> %__mask) {
   %2 = select <32 x i1> %1, <32 x i16> %a, <32 x i16> %b
   ret <32 x i16> %2
 }
+
+; PR19492
+define i128 @split128(<2 x i128> %a, <2 x i128> %b) {
+; SSE4-LABEL: split128:
+; SSE4: addq
+; SSE4: adcq
+; SSE4: addq
+; SSE4: adcq
+; SSE4: addq
+; SSE4: adcq
+; SSE4: ret
+; AVX1-LABEL: split128:
+; AVX1: addq
+; AVX1: adcq
+; AVX1: addq
+; AVX1: adcq
+; AVX1: addq
+; AVX1: adcq
+; AVX1: ret
+; AVX2-LABEL: split128:
+; AVX2: addq
+; AVX2: adcq
+; AVX2: addq
+; AVX2: adcq
+; AVX2: addq
+; AVX2: adcq
+; AVX2: ret
+  %add = add nsw <2 x i128> %a, %b
+  %rdx.shuf = shufflevector <2 x i128> %add, <2 x i128> undef, <2 x i32> <i32 undef, i32 0>
+  %bin.rdx = add <2 x i128> %add, %rdx.shuf
+  %e = extractelement <2 x i128> %bin.rdx, i32 1
+  ret i128 %e
+}