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Full-speed: only do interrupt checking every 40 opcodes & simplify CYC macro (#651)

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tomcw
2019-06-02 14:30:54 +01:00
parent 98a733ba73
commit 1f2dc6ee8a
2 changed files with 15 additions and 12 deletions
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source/CPU.cpp
+14 -11
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@@ -130,12 +130,7 @@ regsrec regs;
unsigned __int64 g_nCumulativeCycles = 0;
static ULONG g_nCyclesExecuted; // # of cycles executed up to last IO access
//static signed long g_uInternalExecutedCycles;
// Use IRQ_CHECK_TIMEOUT=128 when running at full-speed; else use IRQ_CHECK_TIMEOUT=1 (GH#651)
static const int IRQ_CHECK_TIMEOUT_FULL_SPEED = 128;
static const int IRQ_CHECK_TIMEOUT_NORMAL_SPEED = 1;
static signed int g_nIrqCheckTimeout = IRQ_CHECK_TIMEOUT_NORMAL_SPEED;
//
@@ -417,21 +412,29 @@ static __forceinline void IRQ(ULONG& uExecutedCycles, BOOL& flagc, BOOL& flagn,
}
}
const int IRQ_CHECK_OPCODE_FULL_SPEED = 40; // ~128 cycles (assume 3 cycles per opcode)
static int g_fullSpeedOpcodeCount = IRQ_CHECK_OPCODE_FULL_SPEED;
static __forceinline void CheckInterruptSources(ULONG uExecutedCycles, const bool bVideoUpdate)
{
if (g_nIrqCheckTimeout < 0)
if (!bVideoUpdate)
{
MB_UpdateCycles(uExecutedCycles);
sg_Mouse.SetVBlank( !VideoGetVblBar(uExecutedCycles) );
g_nIrqCheckTimeout = bVideoUpdate ? IRQ_CHECK_TIMEOUT_NORMAL_SPEED : IRQ_CHECK_TIMEOUT_FULL_SPEED;
g_fullSpeedOpcodeCount--;
if (g_fullSpeedOpcodeCount >= 0)
return;
g_fullSpeedOpcodeCount = IRQ_CHECK_OPCODE_FULL_SPEED;
}
MB_UpdateCycles(uExecutedCycles);
sg_Mouse.SetVBlank( !VideoGetVblBar(uExecutedCycles) );
}
// GH#608: IRQ needs to occur within 17 cycles (6 opcodes) of configuring the timer interrupt
void CpuAdjustIrqCheck(UINT uCyclesUntilInterrupt)
{
if (g_bFullSpeed && uCyclesUntilInterrupt < IRQ_CHECK_TIMEOUT_FULL_SPEED)
g_nIrqCheckTimeout = uCyclesUntilInterrupt;
const UINT opcodesUntilInterrupt = uCyclesUntilInterrupt/3; // assume 3 cycles per opcode
if (g_bFullSpeed && opcodesUntilInterrupt < IRQ_CHECK_OPCODE_FULL_SPEED)
g_fullSpeedOpcodeCount = opcodesUntilInterrupt;
}
//===========================================================================