Re: [Qemu-devel] [PATCH 0/5] TCG global gen_opc_ arrays clean-up

[Evgeny Voevodin <e.voevodin@samsung.com>]

On 11/21/2012 11:43 AM, Evgeny Voevodin wrote:
> This set of patches moves global variables to tcg_ctx:
> gen_opc_instr
> gen_opparam_icount
> gen_opc_pc
>
> Build tested for all targets.
> Execution tested on Exynos4210 target.
>
> After this patchset was aplied,
> I noticed no speed-up or slow-down of code generation.
>
> Here is the test procedure:
> 1. Boot Linux Kernel 5 times.
> 2. For each iteration wait while "JIT cycles" is stable for ~10 seconds
> 3. Write down the "cycles/op"
>
> Here are the results (tested on gcc-4.6):
>
> Before clean-up:
> min: 655.5
> max: 659.3
> avg: 657.2
> standard deviation: ~2 ~= 0.4%
>
> Average cycles/op = 657 +- 2
>
>
>
> After clean-up:
> min: 654.6
> max: 657.1
> avg: 655.5
> standard deviation: ~1 ~= 0.2%
>
> Average cycles/op = 656 +- 1
>
> Evgeny Voevodin (5):
>    tcg/tcg.h: Duplicate global TCG gen_opc_ arrays into TCGContext.
>    TCG: Use gen_opc_pc from context instead of global variable.
>    TCG: Use gen_opc_icount from context instead of global variable.
>    TCG: Use gen_opc_instr_start from context instead of global variable.
>    TCG: Remove unused global gen_opc_ arrays.
>
>   exec-all.h                    |    4 ----
>   target-alpha/translate.c      |   12 ++++++------
>   target-arm/translate.c        |   12 ++++++------
>   target-cris/translate.c       |   14 +++++++-------
>   target-i386/translate.c       |   19 ++++++++++---------
>   target-lm32/translate.c       |   12 ++++++------
>   target-m68k/translate.c       |   12 ++++++------
>   target-microblaze/translate.c |   12 ++++++------
>   target-mips/translate.c       |   12 ++++++------
>   target-openrisc/translate.c   |   12 ++++++------
>   target-ppc/translate.c        |   12 ++++++------
>   target-s390x/translate.c      |   12 ++++++------
>   target-sh4/translate.c        |   12 ++++++------
>   target-sparc/translate.c      |   12 ++++++------
>   target-unicore32/translate.c  |   12 ++++++------
>   target-xtensa/translate.c     |   10 +++++-----
>   tcg/tcg.h                     |    3 +++
>   translate-all.c               |    9 +++------
>   18 files changed, 100 insertions(+), 103 deletions(-)
>

Ping?

+CC: Alexander Graf <agraf@suse.de>; Paul Brook <paul@codesourcery.com>

-- 
Kind regards,
Evgeny Voevodin,
Technical Leader,
Mobile Group,
Samsung Moscow Research Centre,
e-mail: e.voevodin@samsung.com