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JIT: optimize for the common case of unquantized psq_l/st

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Optimistically assume used GQRs are 0 in blocks that only use one GQR, and
bail at the start of the block and recompile if that assumption fails.

Many games use almost entirely unquantized stores (e.g. Rebel Strike, Sonic
Colors), so this will likely be a big performance improvement across the board
for games with heavy use of paired singles.
This commit is contained in:
Fiora
2015-01-04 04:20:59 -08:00
parent e32d63c43d
commit 8237004448
12 changed files with 275 additions and 17 deletions
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17
Source/Core/Core/PowerPC/PPCAnalyst.cpp
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@ -638,6 +638,7 @@ u32 PPCAnalyzer::Analyze(u32 address, CodeBlock *block, CodeBuffer *buffer, u32
block->m_broken = false;
block->m_memory_exception = false;
block->m_num_instructions = 0;
block->m_gqr_used = BitSet8(0);
if (address == 0)
{
@ -865,6 +866,7 @@ u32 PPCAnalyzer::Analyze(u32 address, CodeBlock *block, CodeBuffer *buffer, u32
// Forward scan, for flags that need the other direction for calculation.
BitSet32 fprIsSingle, fprIsDuplicated, fprIsStoreSafe;
BitSet8 gqrUsed, gqrModified;
for (u32 i = 0; i < block->m_num_instructions; i++)
{
code[i].fprIsSingle = fprIsSingle;
@ -903,7 +905,22 @@ u32 PPCAnalyzer::Analyze(u32 address, CodeBlock *block, CodeBuffer *buffer, u32
if (!strncmp(code[i].opinfo->opname, "mtfs", 4))
fprIsStoreSafe = BitSet32(0);
}
if (code[i].opinfo->type == OPTYPE_STOREPS || code[i].opinfo->type == OPTYPE_LOADPS)
{
int gqr = code[i].inst.OPCD == 4 ? code[i].inst.Ix : code[i].inst.I;
gqrUsed[gqr] = true;
}
if (code[i].inst.OPCD == 31 && code[i].inst.SUBOP10 == 467) // mtspr
{
int gqr = ((code[i].inst.SPRU << 5) | code[i].inst.SPRL) - SPR_GQR0;
if (gqr >= 0 && gqr <= 7)
gqrModified[gqr] = true;
}
}
block->m_gqr_used = gqrUsed;
block->m_gqr_modified = gqrModified;
return address;
}