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Emilio G. Cota b4aa297781 target/i386: optimize indirect branches 
Speed up indirect branches by jumping to the target if it is valid.

Softmmu measurements (see later commit for user-mode numbers):

Note: baseline (i.e. speedup == 1x) is QEMU v2.9.0.

-                  SPECint06 (test set), x86_64-softmmu (Ubuntu 16.04 guest). Host: Intel i7-4790K @ 4.00GHz

 2.4x +-+--------------------------------------------------------------------------------------------------------------+-+
      |                                                                                                                  |
      |   cross                                                                                                          |
 2.2x +cross+jr..........................................................................+++...........................+-+
      |                                                                                   |                              |
      |                                                                               +++ |                              |
   2x +-+..............................................................................|..|............................+-+
      |                                                                                |  |                              |
      |                                                                                |  |                              |
 1.8x +-+..............................................................................|####...........................+-+
      |                                                                                |# |#                             |
      |                                                                              **** |#                             |
 1.6x +-+............................................................................*.|*.|#...........................+-+
      |                                                                              * |* |#                             |
      |                                                                              * |* |#                             |
 1.4x +-+.......................................................................+++..*.|*.|#...........................+-+
      |                                                      ++++++             #### * |*++#             +++             |
      |                        +++                            |  |              #++# *++*  #          +++ |              |
 1.2x +-+......................###.....####....+++............|..|...........****..#.*..*..#....####...|.###.....####..+-+
      |        +++          **** #  ****  #    ####          ***###          *++*  # *  *  #    #++#  ****|#  +++#++#    |
      |    ****###     +++  *++* #  *++*  #  ++#  #    ####  *|* |#     +++  *  *  # *  *  #  ***  #  *| *|#  ****  #    |
   1x +-++-*++*++#++***###++*++*+#++*+-*++#+****++#++***++#+-*+*++#-+****##++*++*-+#+*++*-+#++*+*++#++*-+*+#++*++*++#-++-+
      |    *  *  #  * *  #  *  * #  *  *  # *  *  #  * *  #  *|* |#  *++* #  *  *  # *  *  #  * *  #  *  * #  *  *  #    |
      |    *  *  #  * *  #  *  * #  *  *  # *  *  #  * *  #  *+*++#  *  * #  *  *  # *  *  #  * *  #  *  * #  *  *  #    |
 0.8x +-+--****###--***###--****##--****###-****###--***###--***###--****##--****###-****###--***###--****##--****###--+-+
         astar   bzip2      gcc   gobmk h264ref   hmmlibquantum      mcf omnetpperlbench   sjengxalancbmk   hmean
  png: http://imgur.com/DU36YFU

NB. 'cross' represents the previous commit.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-Id: <1493263764-18657-11-git-send-email-cota@braap.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
2017-06-05 09:25:42 -07:00
..
arch_dump.c hmp: fix "dump-quest-memory" segfault 2017-03-31 11:53:42 +01:00
arch_memory_mapping.c x86: implement la57 paging mode 2016-12-22 16:01:04 +01:00
bpt_helper.c target-i386: Fix eflags.TF/#DB handling of syscall/sysret insns 2016-12-22 16:01:04 +01:00
cc_helper_template.h
cc_helper.c target-i386: Use ctpop helper 2017-01-10 08:49:59 -08:00
cpu-qom.h i386: Define static "base" CPU model 2017-02-27 13:23:27 -03:00
cpu.c qdev: Replace cannot_instantiate_with_device_add_yet with !user_creatable 2017-05-17 10:37:00 -03:00
cpu.h i386: Don't override -cpu options on -cpu host/max 2017-03-28 16:41:10 -03:00
excp_helper.c shutdown: Add source information to SHUTDOWN and RESET 2017-05-23 13:28:17 +02:00
fpu_helper.c linux-user: Add signal handling support for x86_64 2017-02-27 23:10:02 +01:00
gdbstub.c x86: Fix x86_64 'g' packet response to gdb from 32-bit mode. 2016-12-22 16:00:25 +01:00
hax-all.c shutdown: Add source information to SHUTDOWN and RESET 2017-05-23 13:28:17 +02:00
hax-darwin.c hax: add Darwin support 2017-01-19 22:07:46 +01:00
hax-darwin.h hax: add Darwin support 2017-01-19 22:07:46 +01:00
hax-i386.h hax: add Darwin support 2017-01-19 22:07:46 +01:00
hax-interface.h target/i386: Add Intel HAX files 2017-01-19 22:07:46 +01:00
hax-mem.c hax: Fix memory mapping de-duplication logic 2017-05-05 12:10:00 +02:00
hax-windows.c target/i386: Add Intel HAX files 2017-01-19 22:07:46 +01:00
hax-windows.h target/i386: Add Intel HAX files 2017-01-19 22:07:46 +01:00
helper.c shutdown: Add source information to SHUTDOWN and RESET 2017-05-23 13:28:17 +02:00
helper.h target-i386: correctly propagate retaddr into SVM helpers 2017-02-16 18:37:01 +01:00
hyperv.c event_notifier: cleanups around event_notifier_set_handler 2017-01-16 17:52:35 +01:00
hyperv.h
int_helper.c target-i386: Use clz and ctz opcodes 2017-01-10 08:06:11 -08:00
kvm_i386.h kvmclock: reduce kvmclock difference on migration 2016-12-22 16:00:56 +01:00
kvm-stub.c
kvm.c shutdown: Add source information to SHUTDOWN and RESET 2017-05-23 13:28:17 +02:00
machine.c migration/i386: Remove support for pre-0.12 formats 2017-05-11 16:08:51 -03:00
Makefile.objs hax: add Darwin support 2017-01-19 22:07:46 +01:00
mem_helper.c
misc_helper.c target/i386/misc_helper: wrap BQL around another IRQ generator 2017-04-10 10:14:50 +01:00
monitor.c monitor: Fix crashes when using HMP commands without CPU 2017-02-21 18:29:01 +00:00
mpx_helper.c
ops_sse_header.h target-i386: Use ctpop helper 2017-01-10 08:49:59 -08:00
ops_sse.h target-i386: Use ctpop helper 2017-01-10 08:49:59 -08:00
seg_helper.c target-i386: defer VMEXIT to do_interrupt 2017-03-09 10:41:48 +00:00
shift_helper_template.h
smm_helper.c tcg: drop global lock during TCG code execution 2017-02-24 10:32:45 +00:00
svm_helper.c target-i386: defer VMEXIT to do_interrupt 2017-03-09 10:41:48 +00:00
svm.h
TODO
trace-events
translate.c target/i386: optimize indirect branches 2017-06-05 09:25:42 -07:00