8a6b28c7b5
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.
Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-Id: <1493263764-18657-8-git-send-email-cota@braap.org>
[rth: Replace gen_jr global variable with DISAS_EXIT state.]
Signed-off-by: Richard Henderson <rth@twiddle.net>
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|---|---|---|
| .. | ||
| arch_dump.c | ||
| arm-powerctl.c | ||
| arm-powerctl.h | ||
| arm-semi.c | ||
| arm_ldst.h | ||
| cpu-qom.h | ||
| cpu.c | ||
| cpu.h | ||
| cpu64.c | ||
| crypto_helper.c | ||
| gdbstub.c | ||
| gdbstub64.c | ||
| helper-a64.c | ||
| helper-a64.h | ||
| helper.c | ||
| helper.h | ||
| internals.h | ||
| iwmmxt_helper.c | ||
| kvm-consts.h | ||
| kvm-stub.c | ||
| kvm.c | ||
| kvm32.c | ||
| kvm64.c | ||
| kvm_arm.h | ||
| machine.c | ||
| Makefile.objs | ||
| monitor.c | ||
| neon_helper.c | ||
| op_addsub.h | ||
| op_helper.c | ||
| psci.c | ||
| trace-events | ||
| translate-a64.c | ||
| translate.c | ||
| translate.h | ||