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Small JIT WIP fix: I figured out how subfic and subfcx work. It was a

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bit surprising to me that the carry flag works differently between PPC 
and x86...



git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@1789 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
magumagu9 2009-01-05 04:18:10 +00:00
parent 8842357b34
commit fdd06da500
1 changed files with 13 additions and 11 deletions
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24
Source/Core/Core/Src/PowerPC/Jit64IL/Jit_Integer.cpp
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@ -179,29 +179,31 @@
void Jit64::subfic(UGeckoInstruction inst)
{
Default(inst);
return;
// FIXME: Disabling until I figure out subfcx
IREmitter::InstLoc val, test, c;
c = ibuild.EmitIntConst(inst.SIMM_16);
val = ibuild.EmitSub(c, ibuild.EmitLoadGReg(inst.RA));
IREmitter::InstLoc nota, lhs, val, test;
nota = ibuild.EmitXor(ibuild.EmitLoadGReg(inst.RA),
ibuild.EmitIntConst(-1));
if (inst.SIMM_16 == -1) {
val = nota;
test = ibuild.EmitIntConst(1);
} else {
lhs = ibuild.EmitIntConst(inst.SIMM_16 + 1);
val = ibuild.EmitAdd(nota, lhs);
test = ibuild.EmitICmpUgt(lhs, val);
}
ibuild.EmitStoreGReg(val, inst.RD);
test = ibuild.EmitICmpUgt(val, c);
ibuild.EmitStoreCarry(test);
}
void Jit64::subfcx(UGeckoInstruction inst)
{
Default(inst);
return;
// FIXME: Figure out what the heck is going wrong here...
if (inst.OE) PanicAlert("OE: subfcx");
IREmitter::InstLoc val, test, lhs, rhs;
lhs = ibuild.EmitLoadGReg(inst.RB);
rhs = ibuild.EmitLoadGReg(inst.RA);
val = ibuild.EmitSub(lhs, rhs);
ibuild.EmitStoreGReg(val, inst.RD);
test = ibuild.EmitICmpUgt(rhs, lhs);
test = ibuild.EmitICmpEq(rhs, ibuild.EmitIntConst(0));
test = ibuild.EmitOr(test, ibuild.EmitICmpUgt(lhs, val));
ibuild.EmitStoreCarry(test);
if (inst.Rc)
ComputeRC(ibuild, val);