[Qemu-devel] [PATCH v2 00/22] Do away with TB retranslation

[Richard Henderson]

Version 2, updated based on comments.  Notable changes:

  (1) Move breakpoint recognition after insn_start.  Now we really
      do never have zero insns per TB.  Assertions added.
  (2) Comments added.
  (3) Minor tweeks to the encoding, reflected in the comments.

I examined a handfull of test cases, and compiled some sizes:

                AVG DATA/TB     CODE+DATA EXPAND
aarch64-test    15.6            17.7
arm-test        15.9            18.6
sparc-test      18.9            13.6
ppc-test        11.4            14.8
mb-test         12.3            13.5
coldfire-test   10.8            25.0
s390 moonbuggy  16.0            17.7

alpha           12.6            12.7
mips64          31.6            14.8
ppc64           13.5            16.6

Not surprising that mips is larger, since it requests 3 words
of ancilliary data, more than anyone else.  With less than 20
bytes per TB on average, I'm not sure that anything else is
required wrt compression.


r~


Richard Henderson (22):
  tcg: Rename debug_insn_start to insn_start
  target-*: Unconditionally emit tcg_gen_insn_start
  target-*: Increment num_insns immediately after tcg_gen_insn_start
  target-*: Introduce and use cpu_breakpoint_test
  tcg: Allow extra data to be attached to insn_start
  target-arm: Add condexec state to insn_start
  target-i386: Add cc_op state to insn_start
  target-mips: Add delayed branch state to insn_start
  target-s390x: Add cc_op state to insn_start
  target-sh4: Add flags state to insn_start
  target-cris: Mirror gen_opc_pc into insn_start
  target-sparc: Tidy gen_branch_a interface
  target-sparc: Split out gen_branch_n
  target-sparc: Remove gen_opc_jump_pc
  target-sparc: Add npc state to insn_start
  tcg: Merge cpu_gen_code into tb_gen_code
  target-*: Drop cpu_gen_code define
  tcg: Add TCG_MAX_INSNS
  tcg: Pass data argument to restore_state_to_opc
  tcg: Save insn data and use it in cpu_restore_state_from_tb
  tcg: Remove gen_intermediate_code_pc
  tcg: Remove tcg_gen_code_search_pc

 include/exec/exec-all.h       |   6 +-
 include/qom/cpu.h             |  16 +++
 target-alpha/cpu.h            |   1 -
 target-alpha/translate.c      |  70 +++---------
 target-arm/cpu.h              |   2 +-
 target-arm/translate-a64.c    |  62 +++-------
 target-arm/translate.c        |  98 +++++-----------
 target-arm/translate.h        |   8 +-
 target-cris/cpu.h             |   1 -
 target-cris/translate.c       |  93 ++++-----------
 target-cris/translate_v10.c   |   3 -
 target-i386/cpu.h             |   2 +-
 target-i386/translate.c       | 106 +++++------------
 target-lm32/cpu.h             |   1 -
 target-lm32/translate.c       |  83 ++++----------
 target-m68k/cpu.h             |   1 -
 target-m68k/translate.c       |  82 ++++----------
 target-microblaze/cpu.h       |   1 -
 target-microblaze/translate.c |  83 ++++----------
 target-mips/cpu.h             |   2 +-
 target-mips/translate.c       |  98 +++++-----------
 target-moxie/cpu.h            |   1 -
 target-moxie/translate.c      |  82 +++++---------
 target-openrisc/cpu.h         |   1 -
 target-openrisc/translate.c   |  78 +++----------
 target-ppc/cpu.h              |   1 -
 target-ppc/translate.c        |  72 ++++--------
 target-s390x/cpu.h            |   2 +-
 target-s390x/translate.c      |  78 ++++---------
 target-sh4/cpu.h              |   2 +-
 target-sh4/translate.c        |  91 +++++----------
 target-sparc/cpu.h            |   2 +-
 target-sparc/translate.c      | 185 +++++++++++++-----------------
 target-tilegx/translate.c     |  58 +++-------
 target-tricore/translate.c    |  59 ++++------
 target-unicore32/translate.c  |  83 ++++----------
 target-xtensa/cpu.h           |   1 -
 target-xtensa/translate.c     |  79 ++++---------
 tcg/tcg-op.h                  |  52 +++++++--
 tcg/tcg-opc.h                 |   4 +-
 tcg/tcg.c                     | 127 +++++++++++----------
 tcg/tcg.h                     |  16 ++-
 tci.c                         |   9 --
 translate-all.c               | 258 ++++++++++++++++++++++++++----------------
 44 files changed, 782 insertions(+), 1378 deletions(-)

-- 
2.1.0