[Qemu-devel] [PATCH v2 0/9] Improve TCG optimizer

[Aurelien Jarno]

This patch series improves the TCG optimizer, based on patterns found
while executing various guest. The brcond ad setcond constant folding
are useful especially useful when they are used to avoid some argument
values (e.g. division by 0), and thus can be optimized when this argument
is a constant.

This bring around 0.5% improvement on openssl like benchmarks.


Modifications between V1 and V2 following feedback I got:
 - In the first patch, account for the liveness analysis time and 
   optimizing pass time separately
 - Fixed swith/break in patch 7 to correctly throw an error
 - Added patch 9 to make the code more readable
Other patches are unmodified.


Aurelien Jarno (9):
  tcg: improve profiler
  tcg/optimize: split expression simplification
  tcg/optimize: simplify or/xor r, a, 0 cases
  tcg/optimize: simplify and r, a, 0 cases
  tcg/optimize: simplify shift/rot r, 0, a => movi r, 0 cases
  tcg/optimize: swap brcond/setcond arguments when possible
  tcg/optimize: add constant folding for setcond
  tcg/optimize: add constant folding for brcond
  tcg/optimize: fix if/else/break coding style

 tcg/optimize.c |  179 +++++++++++++++++++++++++++++++++++++++++++++++++++-----
 tcg/tcg.c      |   12 +++-
 tcg/tcg.h      |    1 +
 3 files changed, 175 insertions(+), 17 deletions(-)

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1.7.10.4