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dsp: Support 'dec d'

This commit is contained in:
Jannik Vogel 2018-12-26 04:35:47 +01:00 committed by mborgerson
parent fae1e33622
commit f94bcbacfa
2 changed files with 39 additions and 1 deletions
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2
hw/xbox/dsp/dsp_cpu.c
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@ -228,7 +228,7 @@ static const OpcodeEntry nonparallel_opcodes[] = {
{ "00001100000111111111gggd", "cmpu S1, S2", dis_cmpu, emu_cmpu },
{ "000000000000001000000000", "debug", NULL, NULL },
{ "00000000000000110000CCCC", "debugcc", NULL, NULL },
{ "00000000000000000000101d", "dec D", NULL, NULL, /*dis_dec, emu_dec*/ },
{ "00000000000000000000101d", "dec D", NULL /*dis_dec*/, emu_dec },
{ "000000011000000001JJd000", "div S, D", dis_div, emu_div },
{ "000000010010010s1sdkQQQQ", "dmac S1, S2, D", NULL, NULL },
{ "0000011001MMMRRR0S000000", "do [X or Y]:ea, expr", dis_do_ea, emu_do_ea, match_MMMRRR },

38
hw/xbox/dsp/dsp_emu.inl
View File

@ -6605,6 +6605,44 @@ static void emu_cmpu(dsp_core_t* dsp)
dsp->registers[DSP_REG_SR] |= (dest[0]>>4) & 0x8;
}
static void emu_dec(dsp_core_t* dsp)
{
uint32_t destreg, source[3], dest[3];
uint16_t newsr;
destreg = DSP_REG_A + (dsp->cur_inst & 1);
if (destreg == DSP_REG_A) {
dest[0] = dsp->registers[DSP_REG_A2];
dest[1] = dsp->registers[DSP_REG_A1];
dest[2] = dsp->registers[DSP_REG_A0];
} else {
dest[0] = dsp->registers[DSP_REG_B2];
dest[1] = dsp->registers[DSP_REG_B1];
dest[2] = dsp->registers[DSP_REG_B0];
}
source[2] = 1;
source[1] = 0;
source[0] = 0;
newsr = dsp_sub56(source, dest);
if (destreg == DSP_REG_A) {
dsp->registers[DSP_REG_A2] = dest[0];
dsp->registers[DSP_REG_A1] = dest[1];
dsp->registers[DSP_REG_A0] = dest[2];
} else {
dsp->registers[DSP_REG_B2] = dest[0];
dsp->registers[DSP_REG_B1] = dest[1];
dsp->registers[DSP_REG_B0] = dest[2];
}
emu_ccr_update_e_u_n_z(dsp, dest[0], dest[1], dest[2]);
dsp->registers[DSP_REG_SR] &= BITMASK(16)-((1<<DSP_SR_V)|(1<<DSP_SR_C));
dsp->registers[DSP_REG_SR] |= newsr;
}
static void emu_div(dsp_core_t* dsp)
{
uint32_t srcreg, destreg, source[3], dest[3];