ひさびさのパッチ

fht関数もそれなりに速くなったのでパッチにまとめました。パッチはこちらです。

いつものstarwarsの3秒WAVファイルのエンコ結果は以下のとおり。

systemsim % mysim spu 6 display statistics
SPU DD3.0
***
Total Cycle count               981364963
Total Instruction count         643
Total CPI                       1526228.50
***
Performance Cycle count         979809189
Performance Instruction count   597527927 (541391140)
Performance CPI                 1.64 (1.81)

Branch instructions             30037952
Branch taken                    19331618
Branch not taken                10706334

Hint instructions               7303105
Hint hit                        13310919

Contention at LS between Load/Store and Prefetch 14136619

Single cycle                                         339400092 ( 34.6%)
Dual cycle                                           100995524 ( 10.3%)
Nop cycle                                             21308403 (  2.2%)
Stall due to branch miss                             133529380 ( 13.6%)
Stall due to prefetch miss                               94213 (  0.0%)
Stall due to dependency                              321072410 ( 32.8%)
Stall due to fp resource conflict                            0 (  0.0%)
Stall due to waiting for hint target                  14876990 (  1.5%)
Stall due to dp pipeline                               6265944 (  0.6%)
Channel stall cycle                                   42266233 (  4.3%)
SPU Initialization cycle                                     0 (  0.0%)
-----------------------------------------------------------------------
Total cycle                                          979809189 (100.0%)

Stall cycles due to dependency on each pipelines
 FX2        24787486 (  7.7% of all dependency stalls)
 SHUF       108813277 ( 33.9% of all dependency stalls)
 FX3        10420670 (  3.2% of all dependency stalls)
 LS         94967457 ( 29.6% of all dependency stalls)
 BR         242474 (  0.1% of all dependency stalls)
 SPR        488 (  0.0% of all dependency stalls)
 LNOP       0 (  0.0% of all dependency stalls)
 NOP        0 (  0.0% of all dependency stalls)
 FXB        0 (  0.0% of all dependency stalls)
 FP6        60554752 ( 18.9% of all dependency stalls)
 FP7        18592943 (  5.8% of all dependency stalls)
 FPD        2692863 (  0.8% of all dependency stalls)

The number of used registers are 128, the used ratio is 100.00
dumped pipeline stats
systemsim %

979809189/3000000000=0.327[sec]

約9.17倍速です。なかなか劇的な改善はないです。まぁしょうがないですね。