mirror of
https://github.com/dolphin-emu/dolphin.git
synced 2024-09-21 20:01:40 +02:00
f6ce87765f
git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@5437 8ced0084-cf51-0410-be5f-012b33b47a6e
608 lines
16 KiB
C++
608 lines
16 KiB
C++
// Copyright (C) 2003 Dolphin Project.
|
|
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation, version 2.0.
|
|
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License 2.0 for more details.
|
|
|
|
// A copy of the GPL 2.0 should have been included with the program.
|
|
// If not, see http://www.gnu.org/licenses/
|
|
|
|
// Official SVN repository and contact information can be found at
|
|
// http://code.google.com/p/dolphin-emu/
|
|
|
|
// Additional copyrights go to Duddie and Tratax (c) 2004
|
|
|
|
|
|
// Multiplier and product register control
|
|
|
|
#include "DSPInterpreter.h"
|
|
|
|
#include "DSPIntCCUtil.h"
|
|
#include "DSPIntUtil.h"
|
|
|
|
namespace DSPInterpreter {
|
|
|
|
// Only MULX family instructions have unsigned/mixed support.
|
|
inline s64 dsp_get_multiply_prod(u16 a, u16 b, u8 sign)
|
|
{
|
|
s64 prod;
|
|
|
|
if ((sign == 1) && (g_dsp.r[DSP_REG_SR] & SR_MUL_UNSIGNED)) //unsigned
|
|
prod = (u64)a * (u64)b;
|
|
else if ((sign == 2) && (g_dsp.r[DSP_REG_SR] & SR_MUL_UNSIGNED)) //mixed
|
|
prod = (u64)a * (s64)(s16)b;
|
|
else
|
|
prod = (s64)(s16)a * (s64)(s16)b; //signed
|
|
|
|
// Conditionally multiply by 2.
|
|
if ((g_dsp.r[DSP_REG_SR] & SR_MUL_MODIFY) == 0)
|
|
prod <<= 1;
|
|
|
|
return prod;
|
|
}
|
|
|
|
inline s64 dsp_multiply(u16 a, u16 b, u8 sign = 0)
|
|
{
|
|
s64 prod = dsp_get_multiply_prod(a, b, sign);
|
|
return prod;
|
|
}
|
|
|
|
inline s64 dsp_multiply_add(u16 a, u16 b, u8 sign = 0)
|
|
{
|
|
s64 prod = dsp_get_long_prod() + dsp_get_multiply_prod(a, b, sign);
|
|
return prod;
|
|
}
|
|
|
|
inline s64 dsp_multiply_sub(u16 a, u16 b, u8 sign = 0)
|
|
{
|
|
s64 prod = dsp_get_long_prod() - dsp_get_multiply_prod(a, b, sign);
|
|
return prod;
|
|
}
|
|
|
|
inline s64 dsp_multiply_mulx(u8 axh0, u8 axh1, u16 val1, u16 val2)
|
|
{
|
|
s64 result;
|
|
|
|
if ((axh0==0) && (axh1==0))
|
|
result = dsp_multiply(val1, val2, 1); // unsigned support ON if both ax?.l regs are used
|
|
else if ((axh0==0) && (axh1==1))
|
|
result = dsp_multiply(val1, val2, 2); // mixed support ON (u64)axl.0 * (s64)(s16)axh.1
|
|
else if ((axh0==1) && (axh1==0))
|
|
result = dsp_multiply(val2, val1, 2); // mixed support ON (u64)axl.1 * (s64)(s16)axh.0
|
|
else
|
|
result = dsp_multiply(val1, val2, 0); // unsigned support OFF if both ax?.h regs are used
|
|
|
|
return result;
|
|
}
|
|
|
|
//----
|
|
|
|
// CLRP
|
|
// 1000 0100 xxxx xxxx
|
|
// Clears product register $prod.
|
|
// Magic numbers taken from duddie's doc
|
|
//
|
|
// 00ff_(fff0 + 0010)_0000 = 0100_0000_0000, conveniently, lower 40bits = 0
|
|
//
|
|
// It's not ok, to just zero all of them, correct values should be set because of
|
|
// direct use of prod regs by AX/AXWII (look @that part of ucode).
|
|
void clrp(const UDSPInstruction opc)
|
|
{
|
|
zeroWriteBackLog();
|
|
|
|
g_dsp.r[DSP_REG_PRODL] = 0x0000;
|
|
g_dsp.r[DSP_REG_PRODM] = 0xfff0;
|
|
g_dsp.r[DSP_REG_PRODH] = 0x00ff;
|
|
g_dsp.r[DSP_REG_PRODM2] = 0x0010;
|
|
}
|
|
|
|
// TSTPROD
|
|
// 1000 0101 xxxx xxxx
|
|
// Test prod regs value.
|
|
//
|
|
// flags out: --xx xx0x
|
|
void tstprod(const UDSPInstruction opc)
|
|
{
|
|
s64 prod = dsp_get_long_prod();
|
|
Update_SR_Register64(prod);
|
|
zeroWriteBackLog();
|
|
}
|
|
|
|
//----
|
|
|
|
// MOVP $acD
|
|
// 0110 111d xxxx xxxx
|
|
// Moves multiply product from $prod register to accumulator $acD register.
|
|
//
|
|
// flags out: --xx xx0x
|
|
void movp(const UDSPInstruction opc)
|
|
{
|
|
u8 dreg = (opc >> 8) & 0x1;
|
|
|
|
s64 acc = dsp_get_long_prod();
|
|
|
|
zeroWriteBackLog();
|
|
|
|
dsp_set_long_acc(dreg, acc);
|
|
Update_SR_Register64(acc);
|
|
}
|
|
|
|
// MOVNP $acD
|
|
// 0111 111d xxxx xxxx
|
|
// Moves negative of multiply product from $prod register to accumulator
|
|
// $acD register.
|
|
//
|
|
// flags out: --xx xx0x
|
|
void movnp(const UDSPInstruction opc)
|
|
{
|
|
u8 dreg = (opc >> 8) & 0x1;
|
|
|
|
s64 acc = -dsp_get_long_prod();
|
|
|
|
zeroWriteBackLog();
|
|
|
|
dsp_set_long_acc(dreg, acc);
|
|
Update_SR_Register64(acc);
|
|
}
|
|
|
|
// MOVPZ $acD
|
|
// 1111 111d xxxx xxxx
|
|
// Moves multiply product from $prod register to accumulator $acD
|
|
// register and sets (rounds) $acD.l to 0
|
|
//
|
|
// flags out: --xx xx0x
|
|
void movpz(const UDSPInstruction opc)
|
|
{
|
|
u8 dreg = (opc >> 8) & 0x01;
|
|
|
|
s64 acc = dsp_get_long_prod_round_prodl();
|
|
|
|
zeroWriteBackLog();
|
|
|
|
dsp_set_long_acc(dreg, acc);
|
|
Update_SR_Register64(acc);
|
|
}
|
|
|
|
// ADDPAXZ $acD, $axS
|
|
// 1111 10sd xxxx xxxx
|
|
// Adds secondary accumulator $axS to product register and stores result
|
|
// in accumulator register. Low 16-bits of $acD ($acD.l) are set (round) to 0.
|
|
//
|
|
// flags out: --xx xx0x
|
|
void addpaxz(const UDSPInstruction opc)
|
|
{
|
|
u8 dreg = (opc >> 8) & 0x1;
|
|
u8 sreg = (opc >> 9) & 0x1;
|
|
|
|
s64 oldprod = dsp_get_long_prod();
|
|
s64 prod = dsp_get_long_prod_round_prodl();
|
|
s64 ax = dsp_get_long_acx(sreg);
|
|
s64 res = prod + (ax & ~0xffff);
|
|
|
|
zeroWriteBackLog();
|
|
|
|
dsp_set_long_acc(dreg, res);
|
|
res = dsp_get_long_acc(dreg);
|
|
Update_SR_Register64(res, isCarry(oldprod, res), false);
|
|
}
|
|
|
|
//----
|
|
|
|
// MULAXH
|
|
// 1000 0011 xxxx xxxx
|
|
// Multiply $ax0.h by $ax0.h
|
|
void mulaxh(const UDSPInstruction opc)
|
|
{
|
|
s64 prod = dsp_multiply(dsp_get_ax_h(0), dsp_get_ax_h(0));
|
|
|
|
zeroWriteBackLog();
|
|
|
|
dsp_set_long_prod(prod);
|
|
}
|
|
|
|
//----
|
|
|
|
// MUL $axS.l, $axS.h
|
|
// 1001 s000 xxxx xxxx
|
|
// Multiply low part $axS.l of secondary accumulator $axS by high part
|
|
// $axS.h of secondary accumulator $axS (treat them both as signed).
|
|
void mul(const UDSPInstruction opc)
|
|
{
|
|
u8 sreg = (opc >> 11) & 0x1;
|
|
|
|
u16 axl = dsp_get_ax_l(sreg);
|
|
u16 axh = dsp_get_ax_h(sreg);
|
|
s64 prod = dsp_multiply(axh, axl);
|
|
|
|
zeroWriteBackLog();
|
|
|
|
dsp_set_long_prod(prod);
|
|
}
|
|
|
|
// MULAC $axS.l, $axS.h, $acR
|
|
// 1001 s10r xxxx xxxx
|
|
// Add product register to accumulator register $acR. Multiply low part
|
|
// $axS.l of secondary accumulator $axS by high part $axS.h of secondary
|
|
// accumulator $axS (treat them both as signed).
|
|
//
|
|
// flags out: --xx xx0x
|
|
void mulac(const UDSPInstruction opc)
|
|
{
|
|
u8 rreg = (opc >> 8) & 0x1;
|
|
u8 sreg = (opc >> 11) & 0x1;
|
|
|
|
s64 acc = dsp_get_long_acc(rreg) + dsp_get_long_prod();
|
|
u16 axl = dsp_get_ax_l(sreg);
|
|
u16 axh = dsp_get_ax_h(sreg);
|
|
s64 prod = dsp_multiply(axl, axh);
|
|
|
|
zeroWriteBackLog();
|
|
|
|
dsp_set_long_prod(prod);
|
|
dsp_set_long_acc(rreg, acc);
|
|
Update_SR_Register64(dsp_get_long_acc(rreg));
|
|
}
|
|
|
|
// MULMV $axS.l, $axS.h, $acR
|
|
// 1001 s11r xxxx xxxx
|
|
// Move product register to accumulator register $acR. Multiply low part
|
|
// $axS.l of secondary accumulator $axS by high part $axS.h of secondary
|
|
// accumulator $axS (treat them both as signed).
|
|
//
|
|
// flags out: --xx xx0x
|
|
void mulmv(const UDSPInstruction opc)
|
|
{
|
|
u8 rreg = (opc >> 8) & 0x1;
|
|
u8 sreg = ((opc >> 11) & 0x1);
|
|
|
|
s64 acc = dsp_get_long_prod();
|
|
u16 axl = dsp_get_ax_l(sreg);
|
|
u16 axh = dsp_get_ax_h(sreg);
|
|
s64 prod = dsp_multiply(axl, axh);
|
|
|
|
zeroWriteBackLog();
|
|
|
|
dsp_set_long_prod(prod);
|
|
dsp_set_long_acc(rreg, acc);
|
|
Update_SR_Register64(dsp_get_long_acc(rreg));
|
|
}
|
|
|
|
// MULMVZ $axS.l, $axS.h, $acR
|
|
// 1001 s01r xxxx xxxx
|
|
// Move product register to accumulator register $acR and clear (round) low part
|
|
// of accumulator register $acR.l. Multiply low part $axS.l of secondary
|
|
// accumulator $axS by high part $axS.h of secondary accumulator $axS (treat
|
|
// them both as signed).
|
|
//
|
|
// flags out: --xx xx0x
|
|
void mulmvz(const UDSPInstruction opc)
|
|
{
|
|
u8 rreg = (opc >> 8) & 0x1;
|
|
u8 sreg = (opc >> 11) & 0x1;
|
|
|
|
s64 acc = dsp_get_long_prod_round_prodl();
|
|
u16 axl = dsp_get_ax_l(sreg);
|
|
u16 axh = dsp_get_ax_h(sreg);
|
|
s64 prod = dsp_multiply(axl, axh);
|
|
|
|
zeroWriteBackLog();
|
|
|
|
dsp_set_long_prod(prod);
|
|
dsp_set_long_acc(rreg, acc);
|
|
Update_SR_Register64(dsp_get_long_acc(rreg));
|
|
}
|
|
|
|
//----
|
|
|
|
// MULX $ax0.S, $ax1.T
|
|
// 101s t000 xxxx xxxx
|
|
// Multiply one part $ax0 by one part $ax1.
|
|
// Part is selected by S and T bits. Zero selects low part, one selects high part.
|
|
void mulx(const UDSPInstruction opc)
|
|
{
|
|
u8 treg = ((opc >> 11) & 0x1);
|
|
u8 sreg = ((opc >> 12) & 0x1);
|
|
|
|
u16 val1 = (sreg == 0) ? dsp_get_ax_l(0) : dsp_get_ax_h(0);
|
|
u16 val2 = (treg == 0) ? dsp_get_ax_l(1) : dsp_get_ax_h(1);
|
|
s64 prod = dsp_multiply_mulx(sreg, treg, val1, val2);
|
|
|
|
zeroWriteBackLog();
|
|
|
|
dsp_set_long_prod(prod);
|
|
}
|
|
|
|
// MULXAC $ax0.S, $ax1.T, $acR
|
|
// 101s t01r xxxx xxxx
|
|
// Add product register to accumulator register $acR. Multiply one part
|
|
// $ax0 by one part $ax1. Part is selected by S and
|
|
// T bits. Zero selects low part, one selects high part.
|
|
//
|
|
// flags out: --xx xx0x
|
|
void mulxac(const UDSPInstruction opc)
|
|
{
|
|
u8 rreg = (opc >> 8) & 0x1;
|
|
u8 treg = (opc >> 11) & 0x1;
|
|
u8 sreg = (opc >> 12) & 0x1;
|
|
|
|
s64 acc = dsp_get_long_acc(rreg) + dsp_get_long_prod();
|
|
u16 val1 = (sreg == 0) ? dsp_get_ax_l(0) : dsp_get_ax_h(0);
|
|
u16 val2 = (treg == 0) ? dsp_get_ax_l(1) : dsp_get_ax_h(1);
|
|
s64 prod = dsp_multiply_mulx(sreg, treg, val1, val2);
|
|
|
|
zeroWriteBackLog();
|
|
|
|
dsp_set_long_prod(prod);
|
|
dsp_set_long_acc(rreg, acc);
|
|
Update_SR_Register64(dsp_get_long_acc(rreg));
|
|
}
|
|
|
|
// MULXMV $ax0.S, $ax1.T, $acR
|
|
// 101s t11r xxxx xxxx
|
|
// Move product register to accumulator register $acR. Multiply one part
|
|
// $ax0 by one part $ax1. Part is selected by S and
|
|
// T bits. Zero selects low part, one selects high part.
|
|
//
|
|
// flags out: --xx xx0x
|
|
void mulxmv(const UDSPInstruction opc)
|
|
{
|
|
u8 rreg = ((opc >> 8) & 0x1);
|
|
u8 treg = (opc >> 11) & 0x1;
|
|
u8 sreg = (opc >> 12) & 0x1;
|
|
|
|
s64 acc = dsp_get_long_prod();
|
|
u16 val1 = (sreg == 0) ? dsp_get_ax_l(0) : dsp_get_ax_h(0);
|
|
u16 val2 = (treg == 0) ? dsp_get_ax_l(1) : dsp_get_ax_h(1);
|
|
s64 prod = dsp_multiply_mulx(sreg, treg, val1, val2);
|
|
|
|
zeroWriteBackLog();
|
|
|
|
dsp_set_long_prod(prod);
|
|
dsp_set_long_acc(rreg, acc);
|
|
Update_SR_Register64(dsp_get_long_acc(rreg));
|
|
}
|
|
|
|
// MULXMV $ax0.S, $ax1.T, $acR
|
|
// 101s t01r xxxx xxxx
|
|
// Move product register to accumulator register $acR and clear (round) low part
|
|
// of accumulator register $acR.l. Multiply one part $ax0 by one part $ax1
|
|
// Part is selected by S and T bits. Zero selects low part,
|
|
// one selects high part.
|
|
//
|
|
// flags out: --xx xx0x
|
|
void mulxmvz(const UDSPInstruction opc)
|
|
{
|
|
u8 rreg = (opc >> 8) & 0x1;
|
|
u8 treg = (opc >> 11) & 0x1;
|
|
u8 sreg = (opc >> 12) & 0x1;
|
|
|
|
s64 acc = dsp_get_long_prod_round_prodl();
|
|
u16 val1 = (sreg == 0) ? dsp_get_ax_l(0) : dsp_get_ax_h(0);
|
|
u16 val2 = (treg == 0) ? dsp_get_ax_l(1) : dsp_get_ax_h(1);
|
|
s64 prod = dsp_multiply_mulx(sreg, treg, val1, val2);
|
|
|
|
zeroWriteBackLog();
|
|
|
|
dsp_set_long_prod(prod);
|
|
dsp_set_long_acc(rreg, acc);
|
|
Update_SR_Register64(dsp_get_long_acc(rreg));
|
|
}
|
|
|
|
//----
|
|
|
|
// MULC $acS.m, $axT.h
|
|
// 110s t000 xxxx xxxx
|
|
// Multiply mid part of accumulator register $acS.m by high part $axS.h of
|
|
// secondary accumulator $axS (treat them both as signed).
|
|
void mulc(const UDSPInstruction opc)
|
|
{
|
|
u8 treg = (opc >> 11) & 0x1;
|
|
u8 sreg = (opc >> 12) & 0x1;
|
|
|
|
u16 accm = dsp_get_acc_m(sreg);
|
|
u16 axh = dsp_get_ax_h(treg);
|
|
s64 prod = dsp_multiply(accm, axh);
|
|
|
|
zeroWriteBackLog();
|
|
|
|
dsp_set_long_prod(prod);
|
|
}
|
|
|
|
// MULCAC $acS.m, $axT.h, $acR
|
|
// 110s t10r xxxx xxxx
|
|
// Multiply mid part of accumulator register $acS.m by high part $axS.h of
|
|
// secondary accumulator $axS (treat them both as signed). Add product
|
|
// register before multiplication to accumulator $acR.
|
|
//
|
|
// flags out: --xx xx0x
|
|
void mulcac(const UDSPInstruction opc)
|
|
{
|
|
u8 rreg = (opc >> 8) & 0x1;
|
|
u8 treg = (opc >> 11) & 0x1;
|
|
u8 sreg = (opc >> 12) & 0x1;
|
|
|
|
s64 acc = dsp_get_long_acc(rreg) + dsp_get_long_prod();
|
|
u16 accm = dsp_get_acc_m(sreg);
|
|
u16 axh = dsp_get_ax_h(treg);
|
|
s64 prod = dsp_multiply(accm, axh);
|
|
|
|
zeroWriteBackLog();
|
|
|
|
dsp_set_long_prod(prod);
|
|
dsp_set_long_acc(rreg, acc);
|
|
Update_SR_Register64(dsp_get_long_acc(rreg));
|
|
}
|
|
|
|
// MULCMV $acS.m, $axT.h, $acR
|
|
// 110s t11r xxxx xxxx
|
|
// Multiply mid part of accumulator register $acS.m by high part $axT.h of
|
|
// secondary accumulator $axT (treat them both as signed). Move product
|
|
// register before multiplication to accumulator $acR.
|
|
// possible mistake in duddie's doc axT.h rather than axS.h
|
|
//
|
|
// flags out: --xx xx0x
|
|
void mulcmv(const UDSPInstruction opc)
|
|
{
|
|
u8 rreg = (opc >> 8) & 0x1;
|
|
u8 treg = (opc >> 11) & 0x1;
|
|
u8 sreg = (opc >> 12) & 0x1;
|
|
|
|
s64 acc = dsp_get_long_prod();
|
|
u16 accm = dsp_get_acc_m(sreg);
|
|
u16 axh = dsp_get_ax_h(treg);
|
|
s64 prod = dsp_multiply(accm, axh);
|
|
|
|
zeroWriteBackLog();
|
|
|
|
dsp_set_long_prod(prod);
|
|
dsp_set_long_acc(rreg, acc);
|
|
Update_SR_Register64(dsp_get_long_acc(rreg));
|
|
}
|
|
|
|
// MULCMVZ $acS.m, $axT.h, $acR
|
|
// 110s t01r xxxx xxxx
|
|
// (fixed possible bug in duddie's description, s->t)
|
|
// Multiply mid part of accumulator register $acS.m by high part $axT.h of
|
|
// secondary accumulator $axT (treat them both as signed). Move product
|
|
// register before multiplication to accumulator $acR, set (round) low part of
|
|
// accumulator $acR.l to zero.
|
|
//
|
|
// flags out: --xx xx0x
|
|
void mulcmvz(const UDSPInstruction opc)
|
|
{
|
|
u8 rreg = (opc >> 8) & 0x1;
|
|
u8 treg = (opc >> 11) & 0x1;
|
|
u8 sreg = (opc >> 12) & 0x1;
|
|
|
|
s64 acc = dsp_get_long_prod_round_prodl();
|
|
u16 accm = dsp_get_acc_m(sreg);
|
|
u16 axh = dsp_get_ax_h(treg);
|
|
s64 prod = dsp_multiply(accm, axh);
|
|
|
|
zeroWriteBackLog();
|
|
|
|
dsp_set_long_prod(prod);
|
|
dsp_set_long_acc(rreg, acc);
|
|
Update_SR_Register64(dsp_get_long_acc(rreg));
|
|
}
|
|
|
|
//----
|
|
|
|
// MADDX ax0.S ax1.T
|
|
// 1110 00st xxxx xxxx
|
|
// Multiply one part of secondary accumulator $ax0 (selected by S) by
|
|
// one part of secondary accumulator $ax1 (selected by T) (treat them both as
|
|
// signed) and add result to product register.
|
|
void maddx(const UDSPInstruction opc)
|
|
{
|
|
u8 treg = (opc >> 8) & 0x1;
|
|
u8 sreg = (opc >> 9) & 0x1;
|
|
|
|
u16 val1 = (sreg == 0) ? dsp_get_ax_l(0) : dsp_get_ax_h(0);
|
|
u16 val2 = (treg == 0) ? dsp_get_ax_l(1) : dsp_get_ax_h(1);
|
|
s64 prod = dsp_multiply_add(val1, val2);
|
|
|
|
zeroWriteBackLog();
|
|
|
|
dsp_set_long_prod(prod);
|
|
}
|
|
|
|
// MSUBX $(0x18+S*2), $(0x19+T*2)
|
|
// 1110 01st xxxx xxxx
|
|
// Multiply one part of secondary accumulator $ax0 (selected by S) by
|
|
// one part of secondary accumulator $ax1 (selected by T) (treat them both as
|
|
// signed) and subtract result from product register.
|
|
void msubx(const UDSPInstruction opc)
|
|
{
|
|
u8 treg = (opc >> 8) & 0x1;
|
|
u8 sreg = (opc >> 9) & 0x1;
|
|
|
|
u16 val1 = (sreg == 0) ? dsp_get_ax_l(0) : dsp_get_ax_h(0);
|
|
u16 val2 = (treg == 0) ? dsp_get_ax_l(1) : dsp_get_ax_h(1);
|
|
s64 prod = dsp_multiply_sub(val1, val2);
|
|
|
|
zeroWriteBackLog();
|
|
|
|
dsp_set_long_prod(prod);
|
|
}
|
|
|
|
// MADDC $acS.m, $axT.h
|
|
// 1110 10st xxxx xxxx
|
|
// Multiply middle part of accumulator $acS.m by high part of secondary
|
|
// accumulator $axT.h (treat them both as signed) and add result to product
|
|
// register.
|
|
void maddc(const UDSPInstruction opc)
|
|
{
|
|
u8 treg = (opc >> 8) & 0x1;
|
|
u8 sreg = (opc >> 9) & 0x1;
|
|
|
|
u16 accm = dsp_get_acc_m(sreg);
|
|
u16 axh = dsp_get_ax_h(treg);
|
|
s64 prod = dsp_multiply_add(accm, axh);
|
|
|
|
zeroWriteBackLog();
|
|
|
|
dsp_set_long_prod(prod);
|
|
}
|
|
|
|
// MSUBC $acS.m, $axT.h
|
|
// 1110 11st xxxx xxxx
|
|
// Multiply middle part of accumulator $acS.m by high part of secondary
|
|
// accumulator $axT.h (treat them both as signed) and subtract result from
|
|
// product register.
|
|
void msubc(const UDSPInstruction opc)
|
|
{
|
|
u8 treg = (opc >> 8) & 0x1;
|
|
u8 sreg = (opc >> 9) & 0x1;
|
|
|
|
u16 accm = dsp_get_acc_m(sreg);
|
|
u16 axh = dsp_get_ax_h(treg);
|
|
s64 prod = dsp_multiply_sub(accm, axh);
|
|
|
|
zeroWriteBackLog();
|
|
|
|
dsp_set_long_prod(prod);
|
|
}
|
|
|
|
// MADD $axS.l, $axS.h
|
|
// 1111 001s xxxx xxxx
|
|
// Multiply low part $axS.l of secondary accumulator $axS by high part
|
|
// $axS.h of secondary accumulator $axS (treat them both as signed) and add
|
|
// result to product register.
|
|
void madd(const UDSPInstruction opc)
|
|
{
|
|
u8 sreg = (opc >> 8) & 0x1;
|
|
|
|
u16 axl = dsp_get_ax_l(sreg);
|
|
u16 axh = dsp_get_ax_h(sreg);
|
|
s64 prod = dsp_multiply_add(axl, axh);
|
|
|
|
zeroWriteBackLog();
|
|
|
|
dsp_set_long_prod(prod);
|
|
}
|
|
|
|
// MSUB $axS.l, $axS.h
|
|
// 1111 011s xxxx xxxx
|
|
// Multiply low part $axS.l of secondary accumulator $axS by high part
|
|
// $axS.h of secondary accumulator $axS (treat them both as signed) and
|
|
// subtract result from product register.
|
|
void msub(const UDSPInstruction opc)
|
|
{
|
|
u8 sreg = (opc >> 8) & 0x1;
|
|
|
|
u16 axl = dsp_get_ax_l(sreg);
|
|
u16 axh = dsp_get_ax_h(sreg);
|
|
s64 prod = dsp_multiply_sub(axl, axh);
|
|
|
|
zeroWriteBackLog();
|
|
|
|
dsp_set_long_prod(prod);
|
|
}
|
|
|
|
} // namespace
|