piwalker/melonDS
1
0
Fork 0
mirror of https://github.com/melonDS-emu/melonDS.git synced 2025-07-27 00:00:07 -06:00
Code Issues Packages Projects Releases Wiki Activity

improve stm timings

Browse Source 
need to verify if they apply to all store instructions
This commit is contained in:
Jaklyy
2024-06-24 22:50:04 -04:00
parent 109bbed3d0
commit dbe00e72dd
3 changed files with 40 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

42
src/ARM.cpp
View File

@ -1259,6 +1259,31 @@ bool ARMv4::DataWrite32S(u32 addr, u32 val, bool dataabort)
}
void ARMv5::AddCycles_CD()
{
s32 numC = (R[15] & 0x2) ? 0 : CodeCycles;
s32 numD = DataCycles;
s32 early;
if (DataRegion == Mem9_ITCM)
{
early = (CodeRegion == Mem9_ITCM) ? -1 : 0;
}
else if (DataRegion == Mem9_DTCM)
{
early = 2;
}
else if (DataRegion == Mem9_MainRAM)
{
early = (CodeRegion == Mem9_MainRAM) ? 0 : 18; // CHECKME: how early can main ram be?
}
else early = (DataRegion == CodeRegion) ? 4 : 6;
s32 code = numC - early;
if (code < 0) code = 0;
Cycles += std::max(code + numD, numC);
}
void ARMv5::AddCycles_CDI()
{
// LDR/LDM cycles. ARM9 seems to skip the internal cycle there.
@ -1269,7 +1294,7 @@ void ARMv5::AddCycles_CDI()
s32 early;
switch (DataRegion)
{
case 0: // background region; CHECKME
case 0: // background region;
case Mem9_DTCM:
case Mem9_BIOS:
case Mem9_WRAM:
@ -1297,17 +1322,10 @@ void ARMv5::AddCycles_CDI()
early = (CodeRegion == Mem9_ITCM) ? -1 : 0;
break;
}
if (numD > early)
{
numC -= early;
if (numC < 0) numC = 0;
Cycles += numC + numD;
}
else
{
Cycles += numC;
}
s32 code = numC - early;
if (code < 0) code = 0;
Cycles += std::max(code + numD, numC);
}
void ARMv4::AddCycles_C()