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added subp from duddie's doc also added more comments

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git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@2943 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
nakeee
2009-04-09 22:00:08 +00:00
parent f6bc828e63
commit 5184b578c8
3 changed files with 76 additions and 17 deletions
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76
Source/Plugins/Plugin_DSP_LLE/Src/DSPInterpreter.cpp
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@ -883,6 +883,11 @@ void andf(const UDSPInstruction& opc)
}
}
// CMPI $amD, #I
// 0000 001r 1000 0000
// iiii iiii iiii iiii
// Compares mid accumulator $acD.hm ($amD) with sign extended immediate value I.
// Although flags are being set regarding whole accumulator register.
void cmpi(const UDSPInstruction& opc)
{
int reg = (opc.hex >> 8) & 0x1;
@ -895,9 +900,14 @@ void cmpi(const UDSPInstruction& opc)
Update_SR_Register64(res);
}
// XORI $acD.m, #I
// 0000 001r 0010 0000
// iiii iiii iiii iiii
// Logic exclusive or (XOR) of accumulator mid part $acD.m with
// immediate value I.
void xori(const UDSPInstruction& opc)
{
u8 reg = 0x1e + ((opc.hex >> 8) & 0x1);
u8 reg = DSP_REG_ACM0 + ((opc.hex >> 8) & 0x1);
u16 imm = dsp_fetch_code();
g_dsp.r[reg] ^= imm;
@ -910,7 +920,7 @@ void xori(const UDSPInstruction& opc)
// Logic AND of accumulator mid part $acD.m with immediate value I.
void andi(const UDSPInstruction& opc)
{
u8 reg = 0x1e + ((opc.hex >> 8) & 0x1);
u8 reg = DSP_REG_ACM0 + ((opc.hex >> 8) & 0x1);
u16 imm = dsp_fetch_code();
g_dsp.r[reg] &= imm;
@ -919,6 +929,10 @@ void andi(const UDSPInstruction& opc)
// F|RES: i am not sure if this shouldnt be the whole ACC
// ORI $acD.m, #I
// 0000 001r 0110 0000
// iiii iiii iiii iiii
// Logic OR of accumulator mid part $acD.m with immediate value I.
void ori(const UDSPInstruction& opc)
{
u8 reg = 0x1e + ((opc.hex >> 8) & 0x1);
@ -962,6 +976,24 @@ void addp(const UDSPInstruction& opc)
Update_SR_Register64(acc);
}
// SUBP $acD
// 0101 111d xxxx xxxx
// Subtracts product register from accumulator register.
void subp(const UDSPInstruction& opc)
{
u8 dreg = (opc.hex >> 8) & 0x1;
s64 acc = dsp_get_long_acc(dreg);
acc -= dsp_get_long_prod();
dsp_set_long_acc(dreg, acc);
Update_SR_Register64(acc);
}
// CMPIS $acD, #I
// 0000 011d iiii iiii
// Compares accumulator with short immediate. Comaprison is executed
// by subtracting short immediate (8bit sign extended) from mid accumulator
// $acD.hm and computing flags based on whole accumulator $acD.
void cmpis(const UDSPInstruction& opc)
{
u8 areg = (opc.hex >> 8) & 0x1;
@ -1009,6 +1041,9 @@ void movpz(const UDSPInstruction& opc)
Update_SR_Register64(acc);
}
// DECM $acsD
// 0111 100d xxxx xxxx
// Decrement 24-bit mid-accumulator $acsD.
void decm(const UDSPInstruction& opc)
{
u8 dreg = (opc.hex >> 8) & 0x01;
@ -1021,6 +1056,9 @@ void decm(const UDSPInstruction& opc)
Update_SR_Register64(acc);
}
// DEC $acD
// 0111 101d xxxx xxxx
// Decrement accumulator $acD.
void dec(const UDSPInstruction& opc)
{
u8 dreg = (opc.hex >> 8) & 0x01;
@ -1031,6 +1069,9 @@ void dec(const UDSPInstruction& opc)
Update_SR_Register64(acc);
}
// INCM $acsD
// 0111 010d xxxx xxxx
// Increment 24-bit mid-accumulator $acsD.
void incm(const UDSPInstruction& opc)
{
u8 dreg = (opc.hex >> 8) & 0x1;
@ -1043,17 +1084,22 @@ void incm(const UDSPInstruction& opc)
Update_SR_Register64(acc);
}
// INC $acD
// 0111 011d xxxx xxxx
// Increment accumulator $acD.
void inc(const UDSPInstruction& opc)
{
u8 dreg = (opc.hex >> 8) & 0x1;
s64 acc = dsp_get_long_acc(dreg);
acc++;
s64 acc = dsp_get_long_acc(dreg) + 1;
dsp_set_long_acc(dreg, acc);
Update_SR_Register64(acc);
}
// NEG $acD
// 0111 110d xxxx xxxx
// Negate accumulator $acD.
void neg(const UDSPInstruction& opc)
{
u8 areg = (opc.hex >> 8) & 0x1;
@ -1108,13 +1154,13 @@ void addax(const UDSPInstruction& opc)
Update_SR_Register64(acc);
}
// ADDR $acD, $(0x18+S)
// ADDR $acD, $(DSP_REG_AXL0+S)
// 0100 0ssd xxxx xxxx
// Adds register $(0x18+S) to accumulator $acD register.
// Adds register $(DSP_REG_AXL0+S) to accumulator $acD register.
void addr(const UDSPInstruction& opc)
{
u8 areg = (opc.hex >> 8) & 0x1;
u8 sreg = ((opc.hex >> 9) & 0x3) + 0x18;
u8 sreg = ((opc.hex >> 9) & 0x3) + DSP_REG_AXL0;
s64 ax = (s16)g_dsp.r[sreg];
ax <<= 16;
@ -1126,10 +1172,13 @@ void addr(const UDSPInstruction& opc)
Update_SR_Register64(acc);
}
// SUBR $acD, $(DSP_REG_AXL0+S)
// 0101 0ssd xxxx xxxx
// Subtracts register $(DSP_REG_AXL0+S) from accumulator $acD register.
void subr(const UDSPInstruction& opc)
{
u8 areg = (opc.hex >> 8) & 0x1;
u8 sreg = ((opc.hex >> 9) & 0x3) + 0x18;
u8 sreg = ((opc.hex >> 9) & 0x3) + DSP_REG_AXL0;
s64 ax = (s16)g_dsp.r[sreg];
ax <<= 16;
@ -1141,12 +1190,15 @@ void subr(const UDSPInstruction& opc)
Update_SR_Register64(acc);
}
// SUBAX $acD, $axS
// 0101 10sd xxxx xxxx
// Subtracts secondary accumulator $axS from accumulator register $acD.
void subax(const UDSPInstruction& opc)
{
int regD = (opc.hex >> 8) & 0x1;
int regT = (opc.hex >> 9) & 0x1;
int regS = (opc.hex >> 9) & 0x1;
s64 acc = dsp_get_long_acc(regD) - dsp_get_long_acx(regT);
s64 acc = dsp_get_long_acc(regD) - dsp_get_long_acx(regS);
dsp_set_long_acc(regD, acc);
Update_SR_Register64(acc);
@ -1564,6 +1616,7 @@ void mulxac(const UDSPInstruction& opc)
Update_SR_Register64(prod);
}
void mulxmv(const UDSPInstruction& opc)
{
// add old prod to acc
@ -1605,6 +1658,9 @@ void mulxmvz(const UDSPInstruction& opc)
Update_SR_Register64(prod);
}
// SUB $acD, $ac(1-D)
// 0101 110d xxxx xxxx
// Subtracts accumulator $ac(1-D) from accumulator register $acD.
void sub(const UDSPInstruction& opc)
{
u8 D = (opc.hex >> 8) & 0x1;