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Core audio system work (Watch for regressions please!):

Browse Source 
* Restore Audio Throttle to function properly, broken by Ayuanx many hundreds of revisions back. 
* Simplify DSPLLE JIT dispatcher in preparation for an asm rewrite
* Remove hack that made DSPLLE JIT seem faster than it was by running fewer cycles, but resulting in bad sound. This shows off how mysteriously slow it is - I don't understand why it's not faster. Use the DSPLLE interpreter for now if you want to use DSPLLE.
* Made "DSPLLE on Thread" work properly with correct-ish timing - although the speed benefit is really small now.

If it seems like this change slows anything non-LLE down, try turning off Audio Throttle and use the frame limiter in options instead.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@5541 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
hrydgard
2010-05-29 21:34:34 +00:00
parent 6ea0d50872
commit 1d1b08a091
6 changed files with 76 additions and 55 deletions
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55
Source/Core/DSPCore/Src/DSPEmitter.cpp
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@ -215,53 +215,52 @@ const u8 *DSPEmitter::Compile(int start_addr) {
void STACKALIGN DSPEmitter::CompileDispatcher()
{
/*
// TODO
enterDispatcher = GetCodePtr();
AlignCode16();
ABI_PushAllCalleeSavedRegsAndAdjustStack();
const u8 *outer_loop = GetCodePtr();
//Landing pad for drec space
ABI_PopAllCalleeSavedRegsAndAdjustStack();
RET();*/
}
// Don't use the % operator in the inner loop. It's slow.
void STACKALIGN DSPEmitter::RunBlock(int cycles)
int STACKALIGN DSPEmitter::RunForCycles(int cycles)
{
// How does this variable work?
static int idleskip = 0;
const int idle_cycles = 1000;
#define BURST_LENGTH 512 // Must be a power of two
u16 block_cycles = BURST_LENGTH + 1;
// Trigger an external interrupt at the start of the cycle
while (!(g_dsp.cr & CR_HALT))
{
if (block_cycles > BURST_LENGTH)
{
block_cycles = 0;
}
DSPCore_CheckExternalInterrupt();
DSPCore_CheckExceptions();
// Compile the block if needed
if (!blocks[g_dsp.pc])
u16 block_addr = g_dsp.pc;
if (!blocks[block_addr])
{
blockSize[g_dsp.pc] = 0;
CompileCurrent();
}
int block_size = blockSize[block_addr];
// Execute the block if we have enough cycles
if (cycles > blockSize[g_dsp.pc])
if (cycles > block_size)
{
u16 start_addr = g_dsp.pc;
// 5%. Not sure where the rationale originally came from.
if (((idleskip & 127) > 121) &&
(DSPAnalyzer::code_flags[g_dsp.pc] & DSPAnalyzer::CODE_IDLE_SKIP)) {
block_cycles = 0;
blocks[block_addr]();
if (DSPAnalyzer::code_flags[block_addr] & DSPAnalyzer::CODE_IDLE_SKIP) {
if (cycles > idle_cycles)
cycles -= idle_cycles;
else
cycles = 0;
} else {
blocks[g_dsp.pc]();
cycles -= block_size;
}
idleskip++;
if ((idleskip & (BURST_LENGTH - 1)) == 0)
idleskip = 0;
block_cycles += blockSize[start_addr];
cycles -= blockSize[start_addr];
}
else {
break;
}
}
return cycles;
}