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Skip nop instructions #638

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Skip nop instructions #638

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chfast
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@chfast chfast commented Nov 10, 2020 •
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This was originally included in #622.

I can't get good measurement of the performance on Haswell (I will try other architectures later).
But this is rather no-brainer as we simply execute less interpreter loop iterations and the "internal code" is smaller.

Internal code size (opcodes and immediate values)
                            Before      After     Change
--------------------------------------------------------
blake2b                       5467       5431      -0.7%
ecpairing                   356044     355056      -0.3%
keccak256                     9807       9677      -1.3%
memset                        1043       1035      -0.8%
mul256_opt0                   1742       1730      -0.7%
ramanujan_pi                  4922       4828      -1.9%
sha1                          8804       8704      -1.1%
sha256                       14902      14806      -0.6%
taylor_pi                      259        253      -2.3%
micro/eli_interpreter          411        393      -4.4%

Number of instructions executed
                                          Before      After     Change
----------------------------------------------------------------------
blake2b/512_bytes_rounds_1                 46389      44144      -4.8%
blake2b/512_bytes_rounds_16               711684     676709      -4.9%
ecpairing/onepoint                     197487108  195713282      -0.9%
keccak256/512_bytes_rounds_1               44148      43508      -1.4%
keccak256/512_bytes_rounds_16             654045     644700      -1.4%
memset/256_bytes                            4243       3974      -6.3%
memset/60000_bytes                        956413     894533      -6.5%
mul256_opt0/input1                         14755      14647      -0.7%
ramanujan_pi/33_runs                       67378      62112      -7.8%
sha1/512_bytes_rounds_1                    54845      53436      -2.6%
sha1/512_bytes_rounds_16                  773210     753351      -2.6%
sha256/512_bytes_rounds_1                  47934      47823      -0.2%
sha256/512_bytes_rounds_16                670314     669153      -0.2%
taylor_pi/pi_1000000_runs               25000006   24000004      -4.0%
micro/eli_interpreter/exec105               2829       1989     -29.7%
micro/factorial/20                           206        206      -0.0%
micro/fibonacci/24                       1911030    1911030      -0.0%
micro/host_adler32/1                          15         13     -13.3%
micro/host_adler32/1000                    12003      11002      -8.3%
micro/icall_hash/1000_steps                26013      25011      -3.9%
micro/spinner/1                                8          6     -25.0%
micro/spinner/1000                          6002       5001     -16.7%

@chfast chfast requested review from gumb0 and axic November 10, 2020 21:42
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chfast commented Nov 10, 2020

Haswell 4 GHz, GCC10 LTO

fizzy/execute/blake2b/512_bytes_rounds_1_mean                     -0.0641         -0.0641            75            70            75            70
fizzy/execute/blake2b/512_bytes_rounds_16_mean                    +0.0177         +0.0177          1040          1058          1040          1058
fizzy/execute/ecpairing/onepoint_mean                             +0.0098         +0.0098        356215        359701        356218        359703
fizzy/execute/keccak256/512_bytes_rounds_1_mean                   -0.2045         -0.2045            96            77            96            77
fizzy/execute/keccak256/512_bytes_rounds_16_mean                  -0.2076         -0.2076          1408          1115          1408          1115
fizzy/execute/memset/256_bytes_mean                               +0.0619         +0.0619             6             6             6             6
fizzy/execute/memset/60000_bytes_mean                             +0.0683         +0.0683          1322          1412          1322          1412
fizzy/execute/mul256_opt0/input1_mean                             -0.0019         -0.0019            24            24            24            24
fizzy/execute/ramanujan_pi/33_runs_mean                           -0.0180         -0.0180           101            99           101            99
fizzy/execute/sha1/512_bytes_rounds_1_mean                        +0.0348         +0.0348            78            81            78            81
fizzy/execute/sha1/512_bytes_rounds_16_mean                       +0.0413         +0.0413          1084          1128          1084          1128
fizzy/execute/sha256/512_bytes_rounds_1_mean                      +0.0064         +0.0064            77            78            77            78
fizzy/execute/sha256/512_bytes_rounds_16_mean                     +0.0072         +0.0072          1061          1069          1061          1069
fizzy/execute/taylor_pi/pi_1000000_runs_mean                      -0.0122         -0.0122         36663         36215         36663         36215
fizzy/execute/micro/eli_interpreter/exec105_mean                  -0.0219         -0.0219             4             4             4             4
fizzy/execute/micro/factorial/20_mean                             +0.0120         +0.0120             1             1             1             1
fizzy/execute/micro/fibonacci/24_mean                             +0.0265         +0.0265          4712          4837          4712          4837
fizzy/execute/micro/host_adler32/1_mean                           +0.0055         +0.0055             0             0             0             0
fizzy/execute/micro/host_adler32/1000_mean                        +0.0109         +0.0109            28            29            28            29
fizzy/execute/micro/icall_hash/1000_steps_mean                    +0.0372         +0.0372            62            64            62            64
fizzy/execute/micro/spinner/1_mean                                -0.0975         -0.0975             0             0             0             0
fizzy/execute/micro/spinner/1000_mean                             +0.0217         +0.0217             7             8             7             8

gumb0
gumb0 reviewed Nov 11, 2020
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lib/fizzy/parser_expr.cpp Outdated Show resolved Hide resolved
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codecov bot commented Nov 12, 2020 •
edited
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Codecov Report

Merging #638 (2bdbbc5) into master (b58d6e6) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #638   +/-   ##
=======================================
  Coverage   98.36%   98.36%           
=======================================
  Files          69       69           
  Lines        9622     9626    +4     
=======================================
+ Hits         9465     9469    +4     
  Misses        157      157

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chfast commented Nov 12, 2020

Last 4 commits to be squashed, but leaving them for the review period.

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chfast commented Nov 12, 2020

EPYC 7601 2.2 GHz, GCC 10

fizzy/parse/blake2b_mean                                           +0.0055         +0.0055            53            53            53            53
fizzy/instantiate/blake2b_mean                                     -0.0599         -0.0599            65            61            64            61
fizzy/execute/blake2b/512_bytes_rounds_1_mean                      +0.0087         +0.0087           218           220           218           220
fizzy/execute/blake2b/512_bytes_rounds_16_mean                     +0.0157         +0.0159          3327          3379          3326          3379
fizzy/parse/ecpairing_mean                                         -0.0203         -0.0203          2803          2746          2803          2746
fizzy/instantiate/ecpairing_mean                                   -0.0163         -0.0163          2884          2837          2884          2837
fizzy/execute/ecpairing/onepoint_mean                              -0.0506         -0.0504       1163668       1104783       1163290       1104675
fizzy/parse/keccak256_mean                                         -0.0165         -0.0165            96            94            96            94
fizzy/instantiate/keccak256_mean                                   -0.0116         -0.0116           101           100           101           100
fizzy/execute/keccak256/512_bytes_rounds_1_mean                    +0.0023         +0.0023           261           262           261           262
fizzy/execute/keccak256/512_bytes_rounds_16_mean                   +0.0032         +0.0029          3855          3867          3855          3866
fizzy/parse/memset_mean                                            -0.0238         -0.0238            13            13            13            13
fizzy/instantiate/memset_mean                                      -0.0189         -0.0190            19            18            19            18
fizzy/execute/memset/256_bytes_mean                                -0.0290         -0.0289            20            19            20            19
fizzy/execute/memset/60000_bytes_mean                              -0.0082         -0.0082          4307          4271          4306          4271
fizzy/parse/mul256_opt0_mean                                       +0.0454         +0.0454            17            18            17            18
fizzy/instantiate/mul256_opt0_mean                                 +0.0143         +0.0143            22            23            22            23
fizzy/execute/mul256_opt0/input1_mean                              +0.0085         +0.0087            92            93            92            93
fizzy/parse/ramanujan_pi_mean                                      -0.0040         -0.0041            56            55            56            55
fizzy/instantiate/ramanujan_pi_mean                                -0.0127         -0.0127            62            61            62            61
fizzy/execute/ramanujan_pi/33_runs_mean                            -0.0422         -0.0422           434           415           434           415
fizzy/parse/sha1_mean                                              -0.0080         -0.0080            87            86            87            86
fizzy/instantiate/sha1_mean                                        -0.0043         -0.0043            93            92            93            92
fizzy/execute/sha1/512_bytes_rounds_1_mean                         +0.0539         +0.0539           234           247           234           247
fizzy/execute/sha1/512_bytes_rounds_16_mean                        +0.0553         +0.0553          3272          3453          3272          3453
fizzy/parse/sha256_mean                                            -0.0117         -0.0117           147           145           147           145
fizzy/instantiate/sha256_mean                                      -0.0015         -0.0010           151           151           151           151
fizzy/execute/sha256/512_bytes_rounds_1_mean                       +0.1339         +0.1339           242           275           242           275
fizzy/execute/sha256/512_bytes_rounds_16_mean                      +0.1436         +0.1436          3356          3838          3355          3837
fizzy/parse/taylor_pi_mean                                         -0.0246         -0.0251             6             5             6             5
fizzy/instantiate/taylor_pi_mean                                   -0.0081         -0.0084            11            11            11            11
fizzy/execute/taylor_pi/pi_1000000_runs_mean                       -0.3378         -0.3378        118338         78367        118329         78361
fizzy/parse/micro/eli_interpreter_mean                             -0.0419         -0.0419             8             8             8             8
fizzy/instantiate/micro/eli_interpreter_mean                       -0.0233         -0.0233            14            13            14            13
fizzy/execute/micro/eli_interpreter/exec105_mean                   -0.1728         -0.1728            13            10            13            10
fizzy/parse/micro/factorial_mean                                   -0.0806         -0.0807             2             2             2             2
fizzy/instantiate/micro/factorial_mean                             -0.0580         -0.0580             2             2             2             2
fizzy/execute/micro/factorial/20_mean                              -0.0043         -0.0044             1             1             1             1
fizzy/parse/micro/fibonacci_mean                                   -0.0647         -0.0647             3             2             3             2
fizzy/instantiate/micro/fibonacci_mean                             -0.0508         -0.0510             3             3             3             3
fizzy/execute/micro/fibonacci/24_mean                              -0.2370         -0.2370         13666         10427         13665         10426
fizzy/parse/micro/host_adler32_mean                                -0.0591         -0.0591             4             3             4             3
fizzy/instantiate/micro/host_adler32_mean                          -0.0433         -0.0433             7             6             7             6
fizzy/execute/micro/host_adler32/1_mean                            +0.0040         +0.0039             0             0             0             0
fizzy/execute/micro/host_adler32/1000_mean                         +0.0203         +0.0203            57            58            57            58
fizzy/parse/micro/icall_hash_mean                                  -0.0265         -0.0270             7             6             7             6
fizzy/instantiate/micro/icall_hash_mean                            -0.0192         -0.0198            12            12            12            12
fizzy/execute/micro/icall_hash/1000_steps_mean                     +0.0005         +0.0006           122           123           122           122
fizzy/parse/micro/spinner_mean                                     -0.1026         -0.1025             2             2             2             2
fizzy/instantiate/micro/spinner_mean                               -0.0745         -0.0745             2             2             2             2
fizzy/execute/micro/spinner/1_mean                                 -0.0711         -0.0711             0             0             0             0
fizzy/execute/micro/spinner/1000_mean                              -0.0071         -0.0071            17            17            17            17
fizzy/parse/stress/guido-fuzzer-find-1_mean                        +0.0295         +0.0295           247           254           247           254
fizzy/instantiate/stress/guido-fuzzer-find-1_mean                  +0.0288         +0.0291           288           296           288           296

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chfast commented Nov 12, 2020

EPYC 7601 2.2 GHz, GCC10 LTO

fizzy/parse/blake2b_mean                                           +0.0300         +0.0300            54            55            54            55
fizzy/instantiate/blake2b_mean                                     -0.0325         -0.0318            65            63            65            63
fizzy/execute/blake2b/512_bytes_rounds_1_mean                      +0.0478         +0.0478           210           220           210           220
fizzy/execute/blake2b/512_bytes_rounds_16_mean                     +0.0517         +0.0517          3184          3349          3184          3349
fizzy/parse/ecpairing_mean                                         +0.0415         +0.0414          2791          2907          2791          2907
fizzy/instantiate/ecpairing_mean                                   +0.0492         +0.0493          2887          3029          2886          3028
fizzy/execute/ecpairing/onepoint_mean                              -0.0148         -0.0150       1122826       1106192       1122764       1105866
fizzy/parse/keccak256_mean                                         +0.0217         +0.0220            96            98            96            98
fizzy/instantiate/keccak256_mean                                   +0.0246         +0.0246           101           104           101           104
fizzy/execute/keccak256/512_bytes_rounds_1_mean                    -0.0548         -0.0548           270           255           270           255
fizzy/execute/keccak256/512_bytes_rounds_16_mean                   -0.0580         -0.0580          3995          3764          3995          3763
fizzy/parse/memset_mean                                            +0.0265         +0.0267            13            14            13            14
fizzy/instantiate/memset_mean                                      +0.0078         +0.0078            19            19            19            19
fizzy/execute/memset/256_bytes_mean                                -0.2477         -0.2477            26            20            26            20
fizzy/execute/memset/60000_bytes_mean                              -0.2528         -0.2526          5847          4369          5845          4369
fizzy/parse/mul256_opt0_mean                                       +0.0172         +0.0177            17            18            17            18
fizzy/instantiate/mul256_opt0_mean                                 +0.0149         +0.0149            23            23            23            23
fizzy/execute/mul256_opt0/input1_mean                              -0.0396         -0.0396            84            81            84            81
fizzy/parse/ramanujan_pi_mean                                      +0.0161         +0.0159            56            57            56            57
fizzy/instantiate/ramanujan_pi_mean                                +0.0197         +0.0197            61            63            61            63
fizzy/execute/ramanujan_pi/33_runs_mean                            -0.0980         -0.0980           437           394           437           394
fizzy/parse/sha1_mean                                              +0.0305         +0.0304            87            89            87            89
fizzy/instantiate/sha1_mean                                        +0.0258         +0.0259            93            95            93            95
fizzy/execute/sha1/512_bytes_rounds_1_mean                         +0.1289         +0.1289           220           248           220           248
fizzy/execute/sha1/512_bytes_rounds_16_mean                        +0.1282         +0.1283          3066          3459          3065          3459
fizzy/parse/sha256_mean                                            +0.0368         +0.0369           143           148           143           148
fizzy/instantiate/sha256_mean                                      +0.0303         +0.0304           150           154           150           154
fizzy/execute/sha256/512_bytes_rounds_1_mean                       +0.0317         +0.0317           264           273           264           273
fizzy/execute/sha256/512_bytes_rounds_16_mean                      +0.0315         +0.0315          3673          3789          3673          3788
fizzy/parse/taylor_pi_mean                                         -0.0341         -0.0344             6             5             6             5
fizzy/instantiate/taylor_pi_mean                                   -0.0121         -0.0118            11            11            11            11
fizzy/execute/taylor_pi/pi_1000000_runs_mean                       +0.0045         +0.0046         77897         78248         77885         78243
fizzy/parse/micro/eli_interpreter_mean                             -0.0121         -0.0120             8             8             8             8
fizzy/instantiate/micro/eli_interpreter_mean                       -0.0113         -0.0112            14            13            14            13
fizzy/execute/micro/eli_interpreter/exec105_mean                   -0.3408         -0.3406            13             8            13             8
fizzy/parse/micro/factorial_mean                                   -0.0518         -0.0519             2             2             2             2
fizzy/instantiate/micro/factorial_mean                             -0.0428         -0.0428             2             2             2             2
fizzy/execute/micro/factorial/20_mean                              -0.0070         -0.0070             1             1             1             1
fizzy/parse/micro/fibonacci_mean                                   -0.0619         -0.0620             3             2             3             2
fizzy/instantiate/micro/fibonacci_mean                             -0.0438         -0.0438             3             3             3             3
fizzy/execute/micro/fibonacci/24_mean                              -0.0136         -0.0136         10687         10542         10687         10541
fizzy/parse/micro/host_adler32_mean                                -0.0476         -0.0475             4             3             4             3
fizzy/instantiate/micro/host_adler32_mean                          -0.0364         -0.0363             7             6             7             6
fizzy/execute/micro/host_adler32/1_mean                            +0.0024         +0.0024             0             0             0             0
fizzy/execute/micro/host_adler32/1000_mean                         -0.0030         -0.0030            60            60            60            60
fizzy/parse/micro/icall_hash_mean                                  -0.0225         -0.0225             7             6             7             6
fizzy/instantiate/micro/icall_hash_mean                            -0.0186         -0.0188            12            12            12            12
fizzy/execute/micro/icall_hash/1000_steps_mean                     -0.0121         -0.0121           124           123           124           123
fizzy/parse/micro/spinner_mean                                     -0.0958         -0.0958             2             2             2             2
fizzy/instantiate/micro/spinner_mean                               -0.0624         -0.0624             2             2             2             2
fizzy/execute/micro/spinner/1_mean                                 -0.0933         -0.0933             0             0             0             0
fizzy/execute/micro/spinner/1000_mean                              -0.0235         -0.0235            17            17            17            17
fizzy/parse/stress/guido-fuzzer-find-1_mean                        -0.0205         -0.0205           251           245           251           245
fizzy/instantiate/stress/guido-fuzzer-find-1_mean                  -0.0054         -0.0054           289           288           289           288

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gumb0 commented Nov 12, 2020

Test suggestion: function containing all skipped opcodes, check that it's parsed to single end.

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chfast commented Nov 12, 2020

Test suggestion: function containing all skipped opcodes, check that it's parsed to single end.

Added.

@axic axic mentioned this pull request Dec 29, 2020
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@axic axic added the optimization Performance optimization label Mar 29, 2021
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