[Qemu-devel] [PATCH v2 0/7] tcg: Restart TB generation on overflow

[Richard Henderson]

This is for lauchpad 1824853.  The v1 patch set fixed this for
x86 as a host.  This goes further to handle the other cases in
which a TB can become too large, resulting in overflows from
relocations.

Finally, the last two patches take advantage of this.  Since
we now have a reliable way to try again if a relocation overflows,
we can avoid adding extra nops on the off-chance we have to deal
with very large TBs.

There is possibly room for additional work in tcg/riscv, with
respect to its short conditional branches.  But that's probably
best left to someone who can test that properly.


r~


Richard Henderson (7):
  tcg: Hoist max_insns computation to tb_gen_code
  tcg: Restart after TB code generation overflow
  tcg: Restart TB generation after relocation overflow
  tcg: Restart TB generation after constant pool overflow
  tcg: Restart TB generation after out-of-line ldst overflow
  tcg/ppc: Allow the constant pool to overflow at 32k
  tcg/arm: Restrict constant pool displacement to 12 bits

 include/exec/exec-all.h       |  4 +-
 include/exec/translator.h     |  3 +-
 tcg/tcg.h                     | 15 +++----
 accel/tcg/translate-all.c     | 53 +++++++++++++++++++----
 accel/tcg/translator.c        | 15 +------
 target/alpha/translate.c      |  4 +-
 target/arm/translate.c        |  4 +-
 target/cris/translate.c       | 10 +----
 target/hppa/translate.c       |  5 +--
 target/i386/translate.c       |  4 +-
 target/lm32/translate.c       | 10 +----
 target/m68k/translate.c       |  4 +-
 target/microblaze/translate.c | 10 +----
 target/mips/translate.c       |  4 +-
 target/moxie/translate.c      | 11 +----
 target/nios2/translate.c      | 14 +-----
 target/openrisc/translate.c   |  4 +-
 target/ppc/translate.c        |  4 +-
 target/riscv/translate.c      |  4 +-
 target/s390x/translate.c      |  4 +-
 target/sh4/translate.c        |  4 +-
 target/sparc/translate.c      |  4 +-
 target/tilegx/translate.c     | 12 +-----
 target/tricore/translate.c    | 16 +------
 target/unicore32/translate.c  | 10 +----
 target/xtensa/translate.c     |  4 +-
 tcg/aarch64/tcg-target.inc.c  | 16 ++++---
 tcg/arm/tcg-target.inc.c      | 73 ++++++++++++++-----------------
 tcg/i386/tcg-target.inc.c     |  6 ++-
 tcg/mips/tcg-target.inc.c     |  6 ++-
 tcg/ppc/tcg-target.inc.c      | 42 +++++++++---------
 tcg/riscv/tcg-target.inc.c    | 16 +++++--
 tcg/s390/tcg-target.inc.c     | 20 +++++----
 tcg/tcg-ldst.inc.c            | 18 ++++----
 tcg/tcg-pool.inc.c            | 12 +++---
 tcg/tcg.c                     | 81 ++++++++++++++++++-----------------
 36 files changed, 246 insertions(+), 280 deletions(-)

-- 
2.17.1