[PATCH] [x86] Begin a significant overhaul of how vector lowering is done in the x86 backend.

[Jim Grosbach]

LGTM unless Filipe has any additional requests.

================
Comment at: lib/Target/X86/X86ISelLowering.cpp:7321
@@ +7320,3 @@
+                       Input - SourceOffset &&
+                   "Previous placement was different!");
+          }
----------------
Different from what?

I don't have a better suggestion for the message, unfortunately.

http://reviews.llvm.org/D4225