[PATCH] prevent folding a scalar FP load into a packed logical FP instruction (PR22371)

[Sanjay Patel]

Hi Quentin,

I went ahead with your first suggestion of changing the PatFrags to match load128 -> extract in this version of the patch. This corrects the buggy codegen via tablegen pattern-matching, but there's still a potential problem coming from the peephole pass and the load folding tables. I'll try to fix that in a subsequent patch.


http://reviews.llvm.org/D7474

Files:
  lib/Target/X86/X86InstrFragmentsSIMD.td
  lib/Target/X86/X86InstrInfo.cpp
  lib/Target/X86/X86InstrSSE.td
  test/CodeGen/X86/logical-load-fold.ll
  test/CodeGen/X86/stack-align.ll

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