desmume高速化 (20fps -> 19fps)

 nintendo-dsエミュレータである「desmume-0.9.6」の高速化について調査。



 ■ソース場所
http://sourceforge.net/projects/desmume/
から取得。（0.9.6)

■パフォーマンス測定
gprofを使って調べたところ、以下のような結果に

--------------------------------------------------------------------------------------Each sample counts as 0.01 seconds.

  %   cumulative   self              self     total

 time   seconds   seconds    calls  ms/call  ms/call  name

 17.87      1.98     1.98 86528811     0.00     0.00  unsigned int armcpu_exec<0>()

  8.03      2.87     0.89  7630027     0.00     0.00  std::pair<int, int> armInnerLoop<true, true>(unsigned long long, int, int, int)

  7.40      3.69     0.82   121944     0.01     0.01  void RasterizerUnit<true>::runscanlines<false>(edge_fx_fl*, edge_fx_fl*, bool)

  6.68      4.43     0.74   215634     0.00     0.00  void renderline_textBG<false>(GPU*, unsigned short, unsigned short, unsigned short)

  5.14      5.00     0.57 13307193     0.00     0.00  unsigned int OP_LDR_P_IMM_OFF<0>(unsigned int)

  4.24      5.47     0.47      273     1.72    39.74  void NDS_exec<false>(int)

  3.88      5.90     0.43 85447599     0.00     0.00  T1ReadLong_guaranteedAligned(unsigned char*, unsigned int)

  3.61      6.30     0.40  7630299     0.00     0.00  Sequencer::execHardware()

  2.35      6.56     0.26   102540     0.00     0.01  GPU_RenderLine_layer(NDS_Screen*, unsigned short)

  1.71      6.75     0.19  1546298     0.00     0.00  unsigned int OP_STMDB_W<0>(unsigned int)

  1.53      6.92     0.17    21687     0.01     0.01  MemSpan::memcmp(void*, int)

  1.44      7.08     0.16  3712813     0.00     0.00  void FetchADPCMData<(SPUInterpolationMode)1>(channel_struct*, int*)

  1.35      7.23     0.15  2043530     0.00     0.00  unsigned int OP_LDRH_P_IMM_OFF<0>(unsigned int)

  1.35      7.38     0.15   886233     0.00     0.00  void ___SPU_ChanUpdate<2, (SPUInterpolationMode)1>(bool, SPU_struct*, channel_struct*)

  1.26      7.52     0.14  9316652     0.00     0.00  unsigned int armcpu_exec<1>()

  1.17      7.65     0.13  3649263     0.00     0.00  unsigned int OP_CMP_IMM_VAL<0>(unsigned int)

  1.17      7.78     0.13                             ExposeDrawingArea(_GtkWidget*, _GdkEventExpose*, void*)

  1.08      7.90     0.12    42816     0.00     0.00  void GPU::_spriteRender<(GPU::SpriteRenderMode)0>(unsigned char*, unsigned char*, unsign

ed char*, unsigned char*)

  0.99      8.01     0.11  1795737     0.00     0.00  unsigned int OP_LDMIA_W<0>(unsigned int)

  0.99      8.12     0.11   186558     0.00     0.00  execsqrt()

  0.90      8.22     0.10  3141612     0.00     0.00  unsigned int OP_CMP_LSL_IMM<0>(unsigned int)

  0.90      8.32     0.10        2    50.00    50.00  GPU_InitFadeColors()

  0.81      8.41     0.09  4017368     0.00     0.00  unsigned int OP_MOV_LSL_IMM<0>(unsigned int)

  0.81      8.50     0.09  3552284     0.00     0.00  unsigned int OP_STR_P_IMM_OFF<0>(unsigned int)

  0.72      8.58     0.08  2768975     0.00     0.00  gfx3d_sendCommandToFIFO(unsigned int)

  0.72      8.66     0.08  1787255     0.00     0.00  unsigned int OP_AND_IMM_VAL<0>(unsigned int)

  0.72      8.74     0.08   652845     0.00     0.00  SetVertex()

  0.63      8.81     0.07  4497928     0.00     0.00  Adhoc_usTrigger()

  0.63      8.88     0.07      120     0.58     0.58  SoftRasterizerEngine::initFramebuffer(int, int, bool)

  0.54      8.94     0.06  7418877     0.00     0.00  NDS_RescheduleGXFIFO(unsigned int)

  0.54      9.00     0.06  4214488     0.00     0.00  _MMU_ARM9_write32(unsigned int, unsigned int)

  0.45      9.05     0.05  5865898     0.00     0.00  unsigned int OP_B<0>(unsigned int)

  0.45      9.10     0.05  5489484     0.00     0.00  T1ReadLong_guaranteedAligned(unsigned char*, unsigned int)

  0.45      9.15     0.05   869006     0.00     0.00  unsigned int OP_STRH_P_IMM_OFF<0>(unsigned int)

  0.45      9.20     0.05   288666     0.00     0.00  unsigned int OP_LDMIA<0>(unsigned int)

  0.45      9.25     0.05   166992     0.00     0.00  unsigned int OP_STMIA<0>(unsigned int)

  0.36      9.29     0.04  4497927     0.00     0.00  WIFI_usTrigger()

  0.36      9.33     0.04  3043834     0.00     0.00  unsigned int OP_BX<0>(unsigned int)

  0.36      9.37     0.04  2800787     0.00     0.00  _MMU_ARM9_read32(unsigned int)

  0.36      9.41     0.04  2546110     0.00     0.00  unsigned int OP_MOV_IMM_VAL<0>(unsigned int)

  0.36      9.45     0.04  2465196     0.00     0.00  gfx3d_execute(unsigned char, unsigned int)

  0.36      9.49     0.04  1206105     0.00     0.00  unsigned int OP_SUB_S_IMM_VAL<0>(unsigned int)

  0.36      9.53     0.04  1031575     0.00     0.00  unsigned int OP_B<1>(unsigned int)

  0.36      9.57     0.04   832355     0.00     0.00  unsigned int OP_ORR_IMM_VAL<0>(unsigned int)

  0.36      9.61     0.04   435252     0.00     0.00  unsigned int OP_LDRB_M_IMM_OFF_PREIND<0>(unsigned int)

  0.36      9.65     0.04    22341     0.00     0.01  DmaController::doCopy()

  0.36      9.69     0.04      120     0.33     0.33  void SoftRasterizerEngine::performViewportTransforms<false>(int, int)

  0.27      9.72     0.03  4415367     0.00     0.00  setIF(int, unsigned int)

  0.27      9.75     0.03  3326322     0.00     0.00  GFX_PIPErecv(unsigned char*, unsigned int*)

  0.27      9.78     0.03  2465196     0.00     0.00  GFX_FIFOsend(unsigned char, unsigned int)

  0.27      9.81     0.03  1746976     0.00     0.00  unsigned int OP_ORR_LSL_IMM<0>(unsigned int)

  0.27      9.84     0.03  1633516     0.00     0.00  unsigned int OP_AND_S_IMM_VAL<0>(unsigned int)

  0.27      9.87     0.03  1559382     0.00     0.00  armcpu_switchMode(armcpu_t*, unsigned char)

  0.27      9.90     0.03  1251504     0.00     0.00  unsigned int OP_MRS_CPSR<0>(unsigned int)

  0.27      9.93     0.03   991869     0.00     0.00  unsigned int OP_AND_LSL_IMM<0>(unsigned int)

  0.27      9.96     0.03   890318     0.00     0.00  _MMU_ARM9_read16(unsigned int)

  0.27      9.99     0.03   829811     0.00     0.00  unsigned int OP_BIC_IMM_VAL<0>(unsigned int)

  0.27     10.02     0.03   658484     0.00     0.00  ClipperPlane<1, -1, ClipperPlane<1, 1, ClipperPlane<2, -1, ClipperPlane<2, 1, ClipperOut

put> > > >::clipVert(bool, VERT*)

  0.27     10.05     0.03   232003     0.00     0.00  void GFX3D_Clipper::clipPoly<true>(POLY*, VERT**)

  0.27     10.08     0.03   226254     0.00     0.00  unsigned int OP_STMIA_W<0>(unsigned int)

  0.27     10.11     0.03   179374     0.00     0.00  unsigned int OP_LDR_M_IMM_OFF<0>(unsigned int)

  0.27     10.14     0.03   139529     0.00     0.00  unsigned int OP_STRH_P_IMM_OFF<1>(unsigned int)

  0.27     10.17     0.03    72071     0.00     0.00  SPU_MixAudio(bool, SPU_struct*, int)

  0.27     10.20     0.03    21940     0.00     0.01  TexCacheItem* TexCache::scan<(TexCache_TexFormat)2>(unsigned int, unsigned int)

  0.18     10.22     0.02  3391599     0.00     0.00  unsigned int OP_ADD_IMM_VAL<0>(unsigned int)

  0.18     10.24     0.02  3072330     0.00     0.00  unsigned int OP_BL<0>(unsigned int)

  0.18     10.26     0.02  2419545     0.00     0.00  gfx3d_ysort_compare(int, int)

  0.18     10.28     0.02  1427405     0.00     0.00  unsigned int OP_ADD_LSL_IMM<0>(unsigned int)

  0.18     10.30     0.02   743446     0.00     0.00  unsigned int OP_MOV_LSL_IMM<1>(unsigned int)

  0.18     10.32     0.02   691424     0.00     0.00  unsigned int OP_LDRB_P_IMM_OFF<0>(unsigned int)

  0.18     10.34     0.02   624551     0.00     0.00  _MMU_ARM7_write32(unsigned int, unsigned int)

  0.18     10.36     0.02   508937     0.00     0.00  unsigned int OP_MOV_ASR_IMM<0>(unsigned int)

  0.18     10.38     0.02   495594     0.00     0.00  gfx3d_glVertex3_cord(unsigned int, unsigned int, unsigned int)

  0.18     10.40     0.02   444124     0.00     0.00  unsigned int OP_CMP_LSL_IMM<1>(unsigned int)

  0.18     10.42     0.02   319073     0.00     0.00  unsigned int OP_ADD_IMM_VAL<1>(unsigned int)

  0.18     10.44     0.02   297889     0.00     0.00  unsigned int OP_BX<1>(unsigned int)

  0.18     10.46     0.02   274262     0.00     0.00  unsigned int OP_BL<1>(unsigned int)

  0.18     10.48     0.02   262192     0.00     0.00  unsigned int OP_LDMIA_W<1>(unsigned int)

  0.18     10.50     0.02   169058     0.00     0.00  unsigned int OP_MOV_S_LSL_IMM<0>(unsigned int)

  0.18     10.52     0.02    60072     0.00     0.01  void RasterizerUnit<true>::shape_engine<false>(int, bool)

  0.18     10.54     0.02    25936     0.00     0.00  unsigned int OP_LDRSH_P_REG_OFF<1>(unsigned int)

  0.18     10.56     0.02    17404     0.00     0.00  unsigned int OP_STMIB2_W<0>(unsigned int)

  0.18     10.58     0.02      111     0.18     0.31  void std::__introsort_loop<int*, int, bool (*)(int, int)>(int*, int*, int, bool (*)(int,

 int))
--------------------------------------------------------------------------------------

●上記で気になるのは呼び出しが多い関数
armcpu_exec<0>()　と　T1ReadLong_guaranteedAligned() はずば抜けて
呼び出し回数が多い。
INLINE化することにより高速化できないかと検討

■結果
とあるROMにて 20fps->19fpsに高速化を確認

■ソース
 http://sakaihdt.gozaru.jp/desmume.html