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Another batch of x87 opcodes

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This commit is contained in:
Angelo Salese 2012-01-03 16:08:17 +00:00
parent 8cb3ca75cd
commit 3a4babffec
1 changed files with 91 additions and 2 deletions
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93
src/emu/cpu/i386/x87ops.c
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@ -628,7 +628,86 @@ static void I386OP(fpu_group_d9)(i386_state *cpustate) // Opcode 0xd9
static void I386OP(fpu_group_da)(i386_state *cpustate) // Opcode 0xda
{
UINT8 modrm = FETCH(cpustate);
fatalerror("I386: FPU Op DA %02X at %08X", modrm, cpustate->pc-2);
if (modrm < 0xc0)
{
UINT32 ea = GetEA(cpustate,modrm);
X87_REG t;
t.i = READ32(cpustate,ea);
switch ((modrm >> 3) & 0x7)
{
case 0: // FIADD
ST(0).i+=t.i;
CYCLES(cpustate,20);
break;
case 1: // FIMUL
ST(0).i*=t.i;
CYCLES(cpustate,22);
break;
case 2: // FICOM
cpustate->fpu_status_word &= ~(FPU_C3 | FPU_C2 | FPU_C0);
if(ST(0).i == t.i)
cpustate->fpu_status_word |= FPU_C3;
if(ST(0).i < t.i)
cpustate->fpu_status_word |= FPU_C0;
CYCLES(cpustate,15);
break;
case 3: // FICOMP
cpustate->fpu_status_word &= ~(FPU_C3 | FPU_C2 | FPU_C0);
if(ST(0).i == t.i)
cpustate->fpu_status_word |= FPU_C3;
if(ST(0).i < t.i)
cpustate->fpu_status_word |= FPU_C0;
FPU_POP(cpustate);
CYCLES(cpustate,15);
break;
case 4: // FISUB
ST(0).i-=t.i;
CYCLES(cpustate,15);
break;
case 5: // FISUBR
ST(0).i = t.i - ST(0).i;
CYCLES(cpustate,15);
break;
case 6: // FIDIV
ST(0).i/=t.i;
CYCLES(cpustate,84);
break;
case 7: // FIDIVR
ST(0).i = t.i / ST(0).i;
CYCLES(cpustate,84);
break;
default:
fatalerror("I386: FPU Op DA %02X at %08X", modrm, cpustate->pc-2);
}
}
else
{
switch(modrm & 0x3f)
{
case 0x29: // FUCOMPP
cpustate->fpu_status_word &= ~(FPU_C3 | FPU_C2 | FPU_C0);
if(ST(0).f == ST(1).f)
cpustate->fpu_status_word |= FPU_C3;
if(ST(0).f < ST(1).f)
cpustate->fpu_status_word |= FPU_C0;
FPU_POP(cpustate);
FPU_POP(cpustate);
CYCLES(cpustate,5);
break;
default:
fatalerror("I386: FPU Op DA %02X at %08X", modrm, cpustate->pc-2);
}
}
}
static void I386OP(fpu_group_db)(i386_state *cpustate) // Opcode 0xdb
@ -651,6 +730,16 @@ static void I386OP(fpu_group_db)(i386_state *cpustate) // Opcode 0xdb
break;
}
case 2: // FIST
{
X87_REG t;
t = X87_FROUND(cpustate,ST(0));
WRITE32(cpustate,ea,(INT32)t.i);
CYCLES(cpustate,28);
break;
}
case 3: // FISTP
{
X87_REG t;
@ -687,7 +776,7 @@ static void I386OP(fpu_group_db)(i386_state *cpustate) // Opcode 0xdb
cpustate->fpu_inst_ptr = 0;
cpustate->fpu_opcode = 0;
CYCLES(cpustate,1); // TODO
CYCLES(cpustate,17);
break;
}