[PATCH] [x86 - inline asm] Favor reg over memory in asm w/ one input parameter

[Gerolf Hoflehner]

Hi echristo,

When more than one location for an asm parameter is specified,
the most general is selected. In the specific case of an 'rm' constraint
this gives higher priority to a memory vs register location.
In case there is only one input operand this is too conservative.
The purpose of this patch is to allow higher priority for the
register location in that case.

http://reviews.llvm.org/D9271

Files:
  include/llvm/Target/TargetLowering.h
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  lib/CodeGen/SelectionDAG/TargetLowering.cpp
  test/CodeGen/X86/inline-asm-rm-constraint.ll

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