[PATCH] [X86][FastISel] Avoid introducing legacy SSE instructions if the subtarget has AVX.

[Andrea Di Biagio]

Hi Michael,

Here is a new version of the patch which hopefully addresses all your comments.
These are the main differences with respect to the previous patch:

1. I removed all the uses of IMPLICIT_DEF registers. If the target has AVX, the same register is passed to both input operands.
2. I changed the tests so that on SSE, we check that the instruction generated doesn't have a vex prefix.
3. I tried to factor out common code into a separate helper named 'X86SelectFPExtOrFPTrunc'.

Please let me know if ok to submit.

Thanks again for your time,
Andrea


http://reviews.llvm.org/D7438

Files:
  lib/Target/X86/X86FastISel.cpp
  test/CodeGen/X86/fast-isel-fptrunc-fpext.ll

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