[Qemu-devel] [PATCH 0/7] tcg/mips: Minimal R6 support

[James Hogan]

This patchset adds minimal MIPS r6 host support to TCG.

The first two patches are things I've noticed along the way, and are
independent of the other patches.

Patches 3-7 add R6 awareness to the most important operations, such that
instructions removed in R6 don't get emitted. This seems to be enough to
get a MIPS Linux guest booting on a MIPSr6 host (such as QEMU or I6400).
There are no doubt other improvements that could be made to better
utilise new R6 instruction encodings, but that can wait until a later
patchset.

The changes are basically:
- Patch 4: Don't use the MIPSr5 JR encoding (r6 uses JALR with rd=zero).
- Patch 5: Don't use LO/HI registers, instead using the new
  multiply/divide encodings, which map nicely to TCG ops anyway.
- Patch 6-7: Don't use MOVN/MOVZ instructions. Instead use
  SELEQZ/SELNEZ.

James Hogan (7):
  tcg-opc.h: Simplify debug_insn_start def
  disas/mips: Add R6 jr/jr.hb to disassembler
  tcg/mips: Add use_mips32r6_instructions definition
  tcg/mips: Support r6 JR encoding
  tcg/mips: Support r6 multiply/divide encodings
  tcg/mips: Support full movcond select operation
  tcg/mips: Support r6 SEL{NE,EQ}Z instead of MOVN/MOVZ

 disas/mips.c          |  2 ++
 tcg/mips/tcg-target.c | 86 ++++++++++++++++++++++++++++++++++++++++++++++-----
 tcg/mips/tcg-target.h | 11 +++++--
 tcg/tcg-opc.h         | 12 +++----
 4 files changed, 93 insertions(+), 18 deletions(-)

Cc: Aurelien Jarno <address@hidden>
Cc: Richard Henderson <address@hidden>
Cc: Leon Alrae <address@hidden>
-- 
2.4.9