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Implemented FLD and FST Pentium x87 opcodes, used by Savage Quest for testing work RAM banks [Angelo Salese]

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This commit is contained in:
Angelo Salese 2011-12-31 03:38:35 +00:00
parent 9acf3375ed
commit 798474c021
1 changed files with 20 additions and 1 deletions
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21
src/emu/cpu/i386/x87ops.c
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@ -304,6 +304,25 @@ static void I386OP(fpu_group_dd)(i386_state *cpustate) // Opcode 0xdd
switch ((modrm >> 3) & 0x7)
{
case 0: // FLD
{
X87_REG t;
t.i = READ64(cpustate,ea);
FPU_PUSH(cpustate,t);
CYCLES(cpustate,3);
break;
}
case 2: // FST
{
X87_REG t;
t.f = ST(0).f;
WRITE64(cpustate,ea, t.i);
FPU_POP(cpustate);
CYCLES(cpustate,8);
break;
}
case 7: // FSTSW
{
WRITE16(cpustate,ea, (cpustate->fpu_status_word & ~FPU_STACK_TOP_MASK) | (cpustate->fpu_top << 10));
@ -312,7 +331,7 @@ static void I386OP(fpu_group_dd)(i386_state *cpustate) // Opcode 0xdd
}
default:
fatalerror("I386: FPU Op DD %02X at %08X", modrm, cpustate->pc-2);
fatalerror("I386: FPU Op DD %02X (%02X) at %08X", modrm, (modrm >> 3) & 7, cpustate->pc-2);
}
}
else