[PATCH] [PPC] Implement vmrgew and vmrgow instructions

[Bill Schmidt]

Other than a nit in the test case commentary, this LGTM.  Thanks for handling this very confusing stuff and documenting it well!


================
Comment at: test/CodeGen/PowerPC/vec_mergeow.ll:36
@@ +35,3 @@
+; vmrgow instruction. Note also that on little endian the input registers 
+; are swapped also.
+define void @check_merge_even_xx(<16 x i8>* %A) {
----------------
In this case, the swapped input registers comment doesn't matter.

================
Comment at: test/CodeGen/PowerPC/vec_mergeow.ll:85
@@ +84,3 @@
+; vmrgew instruction. Note also that on little endian the input registers 
+; are swapped also.
+define void @check_merge_odd_xx(<16 x i8>* %A) {
----------------
Same comment here.

http://reviews.llvm.org/D10704

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