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Refine idle loop detector.
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This commit is contained in:
Jean-Philip Desjardins 2025-03-10 18:09:36 -04:00
parent fe8a7a0561
commit 883f29ef19
1 changed files with 13 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

17
Source/ee/EeBasicBlock.cpp
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@ -42,6 +42,7 @@ bool CEeBasicBlock::IsCodeIdleLoopBlock() const
{
OP_BEQ = 0x04,
OP_BNE = 0x05,
OP_ADDIU = 0x09,
OP_SLTIU = 0x0B,
OP_ANDI = 0x0C,
OP_XORI = 0x0E,
@ -53,6 +54,8 @@ bool CEeBasicBlock::IsCodeIdleLoopBlock() const
enum
{
OP_SPECIAL_SLL = 0x00,
OP_SPECIAL_ADDU = 0x21,
OP_SPECIAL_SLT = 0x2A,
OP_SPECIAL_SLTU = 0x2B,
};
@ -110,6 +113,11 @@ bool CEeBasicBlock::IsCodeIdleLoopBlock() const
case 0x00:
switch(special)
{
case OP_SPECIAL_SLL:
newUse = (1 << rt);
newDef = (1 << rd);
break;
case OP_SPECIAL_ADDU:
case OP_SPECIAL_SLT:
case OP_SPECIAL_SLTU:
newUse = (1 << rs) | (1 << rt);
@ -126,6 +134,7 @@ bool CEeBasicBlock::IsCodeIdleLoopBlock() const
case OP_LW:
case OP_LQ:
case OP_LBU:
case OP_ADDIU:
case OP_SLTIU:
case OP_XORI:
newUse = (1 << rs);
@ -136,17 +145,17 @@ bool CEeBasicBlock::IsCodeIdleLoopBlock() const
return false;
}
//Remove uses from defs within this block
newUse &= ~defState;
useState |= newUse;
//Bail if this defines any state that we previously used
if(useState & newDef)
{
return false;
}
//Remove uses from defs within this block
newUse &= ~defState;
defState |= newDef;
useState |= newUse;
}
//Just make sure that we've at least defined our comparision register