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subfex optimization when RD==RA

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This commit is contained in:
calc84maniac 2012-01-05 19:07:31 -05:00
parent 60cddf0823
commit a7a6a1859e
1 changed files with 10 additions and 7 deletions
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17
Source/Core/Core/Src/PowerPC/Jit64/Jit_Integer.cpp
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@ -913,28 +913,31 @@ void Jit64::subfex(UGeckoInstruction inst)
JitClearCAOV(inst.OE);
SHR(32, R(EAX), Imm8(30));
// Convert carry to borrow
CMC();
bool invertedCarry = false;
if (d == b)
{
// Convert carry to borrow
CMC();
SBB(32, gpr.R(d), gpr.R(a));
invertedCarry = true;
}
else if (d == a)
{
MOV(32, R(EAX), gpr.R(a));
MOV(32, gpr.R(d), gpr.R(b));
SBB(32, gpr.R(d), R(EAX));
NOT(32, gpr.R(d));
ADC(32, gpr.R(d), gpr.R(b));
}
else
{
// Convert carry to borrow
CMC();
MOV(32, gpr.R(d), gpr.R(b));
SBB(32, gpr.R(d), gpr.R(a));
invertedCarry = true;
}
if (inst.Rc) {
GenerateRC();
}
FinalizeCarryOverflow(inst.OE, true);
FinalizeCarryOverflow(inst.OE, invertedCarry);
gpr.UnlockAll();
}