An identity shuffle shouldn't generate any permute code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27316 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/Generic/vector-identity-shuffle.ll b/test/CodeGen/Generic/vector-identity-shuffle.ll
new file mode 100644 (file)
index 0000000..7ee5fd6
--- /dev/null
+++ b/test/CodeGen/Generic/vector-identity-shuffle.ll
@@ -0,0 +1,16 @@
+; RUN: llvm-as < %s | llc -march=ppc32 -mcpu=g5 | grep _test &&
+; RUN: llvm-as < %s | llc -march=ppc32 -mcpu=g5 | not grep vperm
+
+void %test(<4 x float> *%tmp2.i) {
+       %tmp2.i = load <4x float>* %tmp2.i
+       %xFloat0.48 = extractelement <4 x float> %tmp2.i, uint 0                ; <float> [#uses=1]
+        %inFloat0.49 = insertelement <4 x float> undef, float %xFloat0.48, uint 0               ; <<4 x float>> [#uses=1]
+        %xFloat1.50 = extractelement <4 x float> %tmp2.i, uint 1                ; <float> [#uses=1]
+        %inFloat1.52 = insertelement <4 x float> %inFloat0.49, float %xFloat1.50, uint 1                ; <<4 x float>> [#uses=1]
+        %xFloat2.53 = extractelement <4 x float> %tmp2.i, uint 2                ; <float> [#uses=1]
+        %inFloat2.55 = insertelement <4 x float> %inFloat1.52, float %xFloat2.53, uint 2                ; <<4 x float>> [#uses=1]
+        %xFloat3.56 = extractelement <4 x float> %tmp2.i, uint 3                ; <float> [#uses=1]
+        %inFloat3.58 = insertelement <4 x float> %inFloat2.55, float %xFloat3.56, uint 3                ; <<4 x float>> [#uses=4]
+       store <4 x float> %inFloat3.58, <4x float>* %tmp2.i
+       ret void
+}