[PATCH 0/8] Convert MUL/DIV to fastop

[Avi Kivity <avi.kivity@gmail.com>]

This patchset converts MUL/DIV to fastop.  We depart from the plan, which
was to encode rdx:rax as a single operand, and instead encode it as two
separate operands.  This reduces register pressure on i386, and is simpler
besides.

As a bonus, XADD is converted as well.

The series results in a nice code size reduction:

  60147	      0	      0	  60147	   eaf3	arch/x86/kvm/emulate.o.before
  56899	      0	      0	  56899	   de43	arch/x86/kvm/emulate.o.after


Avi Kivity (8):
  KVM: x86 emulator: add support for writing back the source operand
  KVM: x86 emulator: decode extended accumulator explicity
  KVM: x86 emulator: switch MUL/DIV to DstXacc
  KVM: x86 emulator: Switch fastop src operand to RDX
  KVM: x86 emulator: convert single-operand MUL/IMUL to fastop
  KVM: x86 emulator: convert DIV/IDIV to fastop
  KVM: x86 emulator: drop unused old-style inline emulation
  KVM: x86 emulator: convert XADD to fastop

 arch/x86/kvm/emulate.c | 388 ++++++++++++++-----------------------------------
 1 file changed, 106 insertions(+), 282 deletions(-)

-- 
1.8.1.2