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DSPLLE - 0xa100 figured out = abs(), small mul fix, cleaning, some extra comments

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git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@5216 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
Marko Pusljar 2010-03-19 21:53:41 +00:00
parent 4f56d8144b
commit 503bf545a3
9 changed files with 161 additions and 256 deletions
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48
Source/Core/DSPCore/Src/DspIntArithmetic.cpp
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@ -48,10 +48,9 @@ void clrl(const UDSPInstruction& opc)
{
u8 reg = (opc.hex >> 8) & 0x1;
s64 acc = dsp_get_long_acc(reg);
acc = (acc & ~0xffff) + (((acc & 0xffff) >= 0x8000) ? 0x10000 : 0);
s64 acc = (dsp_get_long_acc(reg) + 0x8000) & ~0xffff;
zeroWriteBackLogPreserveAcc(reg);
zeroWriteBackLog();
dsp_set_long_acc(reg, acc);
Update_SR_Register64(acc);
@ -98,7 +97,7 @@ void andf(const UDSPInstruction& opc)
// 1011 r001 xxxx xxxx
// Test accumulator %acR.
//
// flags out: xx xx00
// flags out: --xx xx00
void tst(const UDSPInstruction& opc)
{
u8 reg = (opc.hex >> 11) & 0x1;
@ -135,8 +134,7 @@ void cmp(const UDSPInstruction& opc)
s64 acc1 = dsp_get_long_acc(1);
s64 res = dsp_convert_long_acc(acc0 - acc1);
//Update_SR_Register64(res, isCarry2(acc0, res), isOverflow(acc0, -acc1, res)); // CF -> problems in ikaruga/nsmb -> 0xa100 ??
Update_SR_Register64(res, false, isOverflow(acc0, -acc1, res));
Update_SR_Register64(res, isCarry2(acc0, res), isOverflow(acc0, -acc1, res)); // CF -> influence on ABS/0xa100
zeroWriteBackLog();
}
@ -441,7 +439,7 @@ void add(const UDSPInstruction& opc)
// 0100 111d xxxx xxxx
// Adds product register to accumulator register.
//
// flags out: x-xx xxxx - CF??
// flags out: x-xx xxxx
void addp(const UDSPInstruction& opc)
{
u8 dreg = (opc.hex >> 8) & 0x1;
@ -564,7 +562,7 @@ void inc(const UDSPInstruction& opc)
// 0101 0ssd xxxx xxxx
// Subtracts register $axS.L from accumulator $acD.M register.
//
// flags out: xx xx00
// flags out: x-xx xxxx
void subr(const UDSPInstruction& opc)
{
u8 dreg = (opc.hex >> 8) & 0x1;
@ -702,6 +700,25 @@ void neg(const UDSPInstruction& opc)
Update_SR_Register64(dsp_get_long_acc(dreg));
}
// ABS $acD
// 1010 d001 xxxx xxxx
// absolute value of $acD
//
// flags out: --xx xx00
void abs(const UDSPInstruction& opc)
{
u8 dreg = (opc.hex >> 11) & 0x1;
s64 acc = dsp_get_long_acc(dreg);
if (acc < 0)
acc = 0 - acc;
zeroWriteBackLog();
dsp_set_long_acc(dreg, acc);
Update_SR_Register64(dsp_get_long_acc(dreg));
}
//----
// MOVR $acD, $axS.R
@ -1092,21 +1109,6 @@ void asrnr(const UDSPInstruction& opc)
Update_SR_Register64(dsp_get_long_acc(dreg));
}
//----
// A100 $acD
// 1010 d001 xxxx xxxx
//
// MIA!! - needed for AX/AXWII
//
void a100(const UDSPInstruction& opc)
{
u8 dreg = (opc.hex >> 11) & 0x1;
//it changes target ACC sometimes!
zeroWriteBackLog();
Update_SR_Register64(dsp_get_long_acc(dreg));
}
} // namespace