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unicorn/qemu/target/arm
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Emilio G. Cota 9aaad9ed27
target/arm: optimize indirect branches 
Speed up indirect branches by jumping to the target if it is valid.

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

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

- Impact on Boot time

| setup | ARM debian jessie boot+shutdown time | stddev |
|--------+--------------------------------------+--------|
| v2.9.0 | 8.84 | 0.07 |
| +cross | 8.85 | 0.03 |
| +jr | 8.83 | 0.06 |

- NBench, arm-softmmu (debian jessie guest). Host: Intel i7-4790K @ 4.00GHz

1.3x +-+-------------------------------------------------------------------------------------------------------------+-+
| |
| cross #### |
1.25x +cross+jr..........................................................#++#.........................................+-+
| #### # # |
| +++# # # # |
| +++ **** # # # |
1.2x +-+...................................####............*..*..#......#..#.........................................+-+
| **** # * * # # # #### |
| * * # * * # # # # # |
1.15x +-+................................*..*..#............*..*..#......#..#.....#..#................................+-+
| * * # * * # # # # # |
| * * # #### * * # # # # # |
| * * # # # * * # # # # # #### |
1.1x +-+................................*..*..#......#..#..*..*..#......#..#.....#..#.........................#..#...+-+
| * * # # # * * # # # # # # # |
| * * # # # * * # # # # # # # |
1.05x +-+..........................####..*..*..#......#..#..*..*..#......#..#.....#..#......+++............*****..#...+-+
| ***** # * * # # # * * # ***** # # # +++ | ****### * * # |
| *+++* # * * # # # * * # *+++* # **** # *****### * * # * * # |
| *****### +++#### * * # * * # ***** # * * # * * # * * # * | *++# * * # * * # |
1x +-++-+*+++*-+#++****++#++*+-+*++#+-*++*++#-+*+++*-+#++*++*++#++*+-+*++#+-*++*++#-+*+++*-+#++*++*++#++*+-+*++#+-++-+
| * * # * * # * * # * * # * * # * * # * * # * * # * * # * * # * * # |
| * * # * * # * * # * * # * * # * * # * * # * * # * * # * * # * * # |
0.95x +-+---*****###--****###--*****###--****###--*****###--****###--*****###--****###--*****###--****###--*****###---+-+
ASSIGNMENT BITFIELD FOURFP EMULATION HUFFMAN LU DECOMPOSITIONEURAL NNUMERIC SOSTRING SORT hmean
png: http://imgur.com/eOLmZNR

NB. 'cross' represents the previous commit.

Backports commit 8a6b28c7b5104263344508df0f4bce97f22cfcaf from qemu
2018-03-02 21:18:15 -05:00
..
arm-powerctl.c ARM: Factor out ARM on/off PSCI control functions 2018-03-01 23:31:47 -05:00
arm-powerctl.h ARM: Factor out ARM on/off PSCI control functions 2018-03-01 23:31:47 -05:00
arm_ldst.h Fix Thumb-1 BE32 execution and disassembly. 2018-03-02 00:20:11 -05:00
cpu-qom.h Move target-* CPU file into a target/ folder 2018-03-01 22:50:58 -05:00
cpu.c target/arm: add data cache invalidation cp15 instruction to cortex-r5 2018-03-02 20:04:20 -05:00
cpu.h armv7m: Check exception return consistency 2018-03-02 19:59:18 -05:00
cpu64.c target-arm: Enable EL2 feature bit on A53 and A57 2018-03-01 23:36:44 -05:00
crypto_helper.c Move target-* CPU file into a target/ folder 2018-03-01 22:50:58 -05:00
helper-a64.c Move target-* CPU file into a target/ folder 2018-03-01 22:50:58 -05:00
helper-a64.h Move target-* CPU file into a target/ folder 2018-03-01 22:50:58 -05:00
helper.c armv7m: Raise correct kind of UsageFault for attempts to execute ARM code 2018-03-02 20:00:58 -05:00
helper.h Move target-* CPU file into a target/ folder 2018-03-01 22:50:58 -05:00
internals.h arm: Move excnames[] array into arm_log_exceptions() 2018-03-02 14:39:37 -05:00
iwmmxt_helper.c Move target-* CPU file into a target/ folder 2018-03-01 22:50:58 -05:00
kvm-consts.h arm: better stub version for MISMATCH_CHECK 2018-03-02 00:13:45 -05:00
Makefile.objs ARM: Factor out ARM on/off PSCI control functions 2018-03-01 23:31:47 -05:00
neon_helper.c Move target-* CPU file into a target/ folder 2018-03-01 22:50:58 -05:00
op_addsub.h Move target-* CPU file into a target/ folder 2018-03-01 22:50:58 -05:00
op_helper.c arm: Add support for M profile CPUs having different MMU index semantics 2018-03-02 18:59:13 -05:00
psci.c target/arm/psci.c: If EL2 implemented, start CPUs in EL2 2018-03-01 23:34:57 -05:00
translate-a64.c arm: Add support for M profile CPUs having different MMU index semantics 2018-03-02 18:59:13 -05:00
translate.c target/arm: optimize indirect branches 2018-03-02 21:18:15 -05:00
translate.h target/arm: optimize indirect branches 2018-03-02 21:18:15 -05:00
unicorn.h Move target-* CPU file into a target/ folder 2018-03-01 22:50:58 -05:00
unicorn_aarch64.c Move target-* CPU file into a target/ folder 2018-03-01 22:50:58 -05:00
unicorn_arm.c Move target-* CPU file into a target/ folder 2018-03-01 22:50:58 -05:00