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[FAST486]

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Implement FDECSTP, FINCSTP and FXTRACT.


svn path=/trunk/; revision=66156
This commit is contained in:
Aleksandar Andrejevic 2015-02-04 03:22:48 +00:00
parent 6af8dff1f8
commit ec76f48f58
1 changed files with 38 additions and 8 deletions
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46
reactos/lib/fast486/fpu.c
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@ -1526,8 +1526,42 @@ FAST486_OPCODE_HANDLER(Fast486FpuOpcodeD9)
/* FXTRACT */
case 0x34:
{
// TODO: NOT IMPLEMENTED
UNIMPLEMENTED;
FAST486_FPU_DATA_REG Value = FPU_ST(0);
if ((FPU_GET_TAG(0) == FPU_TAG_EMPTY) || FPU_IS_INDEFINITE(&Value))
{
State->FpuStatus.Ie = TRUE;
if (FPU_GET_TAG(0) == FPU_TAG_EMPTY) State->FpuStatus.Sf = TRUE;
if (!State->FpuControl.Im) Fast486FpuException(State);
break;
}
if (FPU_IS_ZERO(&Value))
{
/* The exponent of zero is negative infinity */
FPU_ST(0).Sign = TRUE;
FPU_ST(0).Exponent = FPU_MAX_EXPONENT + 1;
FPU_ST(0).Mantissa = FPU_MANTISSA_HIGH_BIT;
}
else if (FPU_IS_INFINITY(&Value))
{
/* The exponent of infinity is positive infinity */
FPU_ST(0).Sign = FALSE;
FPU_ST(0).Exponent = FPU_MAX_EXPONENT + 1;
FPU_ST(0).Mantissa = FPU_MANTISSA_HIGH_BIT;
}
else
{
/* Store the unbiased exponent in ST0 */
Fast486FpuFromInteger(State,
(LONGLONG)Value.Exponent - (LONGLONG)FPU_REAL10_BIAS,
&FPU_ST(0));
}
/* Now push the mantissa as a real number, with the original sign */
Value.Exponent = FPU_REAL10_BIAS;
Fast486FpuPush(State, &Value);
break;
}
@ -1544,18 +1578,14 @@ FAST486_OPCODE_HANDLER(Fast486FpuOpcodeD9)
/* FDECSTP */
case 0x36:
{
// TODO: NOT IMPLEMENTED
UNIMPLEMENTED;
State->FpuStatus.Top--;
break;
}
/* FINCSTP */
case 0x37:
{
// TODO: NOT IMPLEMENTED
UNIMPLEMENTED;
State->FpuStatus.Top++;
break;
}