piwalker/dolphin
1
0
Fork 0
mirror of https://github.com/dolphin-emu/dolphin.git synced 2025-07-28 16:49:58 -06:00
Code Issues Packages Projects Releases Wiki Activity

DSP: Fix broken disassembly (deleted some remaining byteswaps). Don't check for external interrupts every cycle. Loop endpoint detector added to Analyzer (this will be useful for a future JIT).

Browse Source 
git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@2940 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
hrydgard
2009-04-09 13:03:41 +00:00
parent 8c861ad58d
commit 0f26228ef2
6 changed files with 117 additions and 83 deletions
Download Patch File Download Diff File Expand all files Collapse all files

46
Source/Plugins/Plugin_DSP_LLE/Src/DSPAnalyzer.cpp
View File

@ -36,22 +36,22 @@ u8 code_flags[ISPACE];
// 0xFFFF means ignore.
const u16 idle_skip_sigs[NUM_IDLE_SIGS][MAX_IDLE_SIG_SIZE + 1] =
{
{ 0x26fc, // LRS $30, @DMBH
0x02c0, 0x8000, // ANDCF $30, #0x8000
0x029d, 0xFFFF, // JLZ 0x027a
0, 0 }, // RET
{ 0x27fc, // LRS $31, @DMBH
0x03c0, 0x8000, // ANDCF $31, #0x8000
0x029d, 0xFFFF, // JLZ 0x027a
0, 0 }, // RET
{ 0x26fe, // LRS $30, @CMBH
0x02c0, 0x8000, // ANDCF $30, #0x8000
0x029c, 0xFFFF, // JLNZ 0x0280
0, 0 }, // RET
{ 0x27fe, // LRS $31, @CMBH
0x03c0, 0x8000, // ANDCF $31, #0x8000
0x029c, 0xFFFF, // JLNZ 0x0280
0, 0 }, // RET
{ 0x26fc, // LRS $30, @DMBH
0x02c0, 0x8000, // ANDCF $30, #0x8000
0x029d, 0xFFFF, // JLZ 0x027a
0, 0 }, // RET
{ 0x27fc, // LRS $31, @DMBH
0x03c0, 0x8000, // ANDCF $31, #0x8000
0x029d, 0xFFFF, // JLZ 0x027a
0, 0 }, // RET
{ 0x26fe, // LRS $30, @CMBH
0x02c0, 0x8000, // ANDCF $30, #0x8000
0x029c, 0xFFFF, // JLNZ 0x0280
0, 0 }, // RET
{ 0x27fe, // LRS $31, @CMBH
0x03c0, 0x8000, // ANDCF $31, #0x8000
0x029c, 0xFFFF, // JLNZ 0x0280
0, 0 }, // RET
};
void Reset()
@ -64,8 +64,8 @@ void AnalyzeRange(int start_addr, int end_addr)
// First we run an extremely simplified version of a disassembler to find
// where all instructions start.
// This may not be 100% accurate in case of jump tables, but should be good
// enough as a start.
// This may not be 100% accurate in case of jump tables!
// It could get desynced, which would be bad. We'll see if that's an issue.
int addr = start_addr;
while (addr < end_addr)
{
@ -78,6 +78,16 @@ void AnalyzeRange(int start_addr, int end_addr)
}
code_flags[addr] |= CODE_START_OF_INST;
addr += opcode->size;
// Look for loops.
if ((inst.hex & 0xffe0) == 0x0060 || (inst.hex & 0xff00) == 0x1100) {
// BLOOP, BLOOPI
u16 loop_end = dsp_imem_read(addr + 1);
code_flags[loop_end] |= CODE_LOOP_END;
} else if ((inst.hex & 0xffe0) == 0x0040 || (inst.hex & 0xff00) == 0x1000) {
// LOOP, LOOPI
code_flags[addr + 1] |= CODE_LOOP_END;
}
}
// Next, we'll scan for potential idle skips.