[PATCH] [X86] replace vinsertf128 intrinsics with generic shuffles

[Sanjay Patel]

Ah - I had looked at a problem where we accept a variable when only a constant is acceptable:
http://llvm.org/bugs/show_bug.cgi?id=21713

Not sure if that's still a bug.

In any case, patch updated:

1. Use macros.
2. Shuffle mask elements generated individually via selects.
3. More test cases added to confirm the that the masks are good.


http://reviews.llvm.org/D8088

Files:
  include/clang/Basic/BuiltinsX86.def
  lib/Headers/avxintrin.h
  lib/Sema/SemaChecking.cpp
  test/CodeGen/avx-shuffle-builtins.c
  test/CodeGen/builtins-x86.c

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