This should turn into one vector shuffle instruction.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27996 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/InstCombine/vec_insert_to_shuffle.ll b/test/Transforms/InstCombine/vec_insert_to_shuffle.ll
new file mode 100644 (file)
index 0000000..0379203
--- /dev/null
+++ b/test/Transforms/InstCombine/vec_insert_to_shuffle.ll
@@ -0,0 +1,14 @@
+; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep shufflevec | wc -l | grep 1 &&
+; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep insertelement &&
+; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep extractelement
+
+<4 x float> %test(<4 x float> %tmp, <4 x float> %tmp1) {
+       %tmp4 = extractelement <4 x float> %tmp, uint 1         ; <float> [#uses=1]
+       %tmp2 = extractelement <4 x float> %tmp, uint 3         ; <float> [#uses=1]
+       %tmp1 = extractelement <4 x float> %tmp1, uint 0                ; <float> [#uses=1]
+       %tmp128 = insertelement <4 x float> undef, float %tmp4, uint 0          ; <<4 x float>> [#uses=1]
+       %tmp130 = insertelement <4 x float> %tmp128, float undef, uint 1                ; <<4 x float>> [#uses=1]
+       %tmp132 = insertelement <4 x float> %tmp130, float %tmp2, uint 2                ; <<4 x float>> [#uses=1]
+       %tmp134 = insertelement <4 x float> %tmp132, float %tmp1, uint 3                ; <<4 x float>> [#uses=1]
+       ret <4 x float> %tmp134
+}