diff --git a/src/ARM.cpp b/src/ARM.cpp index 4ee72a3a..7e2e8874 100644 --- a/src/ARM.cpp +++ b/src/ARM.cpp @@ -169,8 +169,7 @@ void ARMv5::JumpTo(u32 addr, bool restorecpsr) u32 oldregion = R[15] >> 24; u32 newregion = addr >> 24; - if (addr < ITCMSize) CodeCycles = 1; - else CodeCycles = MemTimings[addr >> 12][0]; + RegionCodeCycles = MemTimings[addr >> 12][0]; s32 cycles; @@ -476,7 +475,7 @@ s32 ARMv5::Execute() R[15] += 2; CurInstr = NextInstr[0]; NextInstr[0] = NextInstr[1]; - if (R[15] & 0x2) NextInstr[1] >>= 16; + if (R[15] & 0x2) { NextInstr[1] >>= 16; CodeCycles = 0; } else NextInstr[1] = CodeRead32(R[15]); // actually execute diff --git a/src/ARM.h b/src/ARM.h index 649fe8e8..9a9b03c6 100644 --- a/src/ARM.h +++ b/src/ARM.h @@ -263,6 +263,8 @@ public: // code/16N/32N/32S u8 MemTimings[0x100000][4]; + + s32 RegionCodeCycles; }; class ARMv4 : public ARM diff --git a/src/CP15.cpp b/src/CP15.cpp index c35e653b..2187faea 100644 --- a/src/CP15.cpp +++ b/src/CP15.cpp @@ -27,8 +27,9 @@ // this was measured to be close to hardware average // a value of 1 would represent a perfect cache, but that causes // games to run too fast, causing a number of issues +// code cache timing can get as low as 3 const int kDataCacheTiming = 2; -const int kCodeCacheTiming = 2; +const int kCodeCacheTiming = 5; void ARMv5::CP15Reset() @@ -241,7 +242,7 @@ void ARMv5::UpdateRegionTimings(u32 addrstart, u32 addrend) if (pu & 0x40) { - MemTimings[i][0] = kCodeCacheTiming; + MemTimings[i][0] = 0xFF;//kCodeCacheTiming; } else { @@ -252,7 +253,7 @@ void ARMv5::UpdateRegionTimings(u32 addrstart, u32 addrend) { MemTimings[i][1] = kDataCacheTiming; MemTimings[i][2] = kDataCacheTiming; - MemTimings[i][3] = kDataCacheTiming; + MemTimings[i][3] = 1; } else { @@ -511,9 +512,18 @@ u32 ARMv5::CodeRead32(u32 addr) { if (addr < ITCMSize) { + CodeCycles = 1; return *(u32*)&ITCM[addr & 0x7FFF]; } + CodeCycles = RegionCodeCycles; + if (CodeCycles == 0xFF) + { + // sort of code cache hit/miss average + if (!(addr & 0x1F)) CodeCycles = kCodeCacheTiming; + else CodeCycles = 1; + } + if (CodeMem.Mem) return *(u32*)&CodeMem.Mem[addr & CodeMem.Mask]; return NDS::ARM9Read32(addr);