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[FAST486]

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- Don't forget to check whether the FPU stack element exists before using it.
- Implement FSCALE.


svn path=/trunk/; revision=67818
This commit is contained in:
Aleksandar Andrejevic 2015-05-17 21:52:12 +00:00
parent 5be848439a
commit a6d59a04f6
1 changed files with 152 additions and 2 deletions
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154
reactos/lib/fast486/fpu.c
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@ -1699,6 +1699,25 @@ FAST486_OPCODE_HANDLER(Fast486FpuOpcodeD9)
{
FPU_SAVE_LAST_INST();
if (FPU_GET_TAG(0) == FPU_TAG_EMPTY)
{
State->FpuStatus.Ie = TRUE;
if (!State->FpuControl.Im) Fast486FpuException(State);
break;
}
if (!FPU_IS_NORMALIZED(&FPU_ST(0)))
{
State->FpuStatus.De = TRUE;
if (!State->FpuControl.Dm)
{
Fast486FpuException(State);
break;
}
}
Fast486FpuCalculateTwoPowerMinusOne(State, &FPU_ST(0), &FPU_ST(0));
FPU_UPDATE_TAG(0);
@ -1831,6 +1850,25 @@ FAST486_OPCODE_HANDLER(Fast486FpuOpcodeD9)
FAST486_FPU_DATA_REG Number = FPU_ST(0);
FPU_SAVE_LAST_INST();
if (FPU_GET_TAG(0) == FPU_TAG_EMPTY)
{
State->FpuStatus.Ie = TRUE;
if (!State->FpuControl.Im) Fast486FpuException(State);
break;
}
if (!FPU_IS_NORMALIZED(&FPU_ST(0)))
{
State->FpuStatus.De = TRUE;
if (!State->FpuControl.Dm)
{
Fast486FpuException(State);
break;
}
}
/* Replace FP0 with the sine */
if (!Fast486FpuCalculateSine(State, &Number, &FPU_ST(0))) break;
FPU_UPDATE_TAG(0);
@ -1890,8 +1928,82 @@ FAST486_OPCODE_HANDLER(Fast486FpuOpcodeD9)
/* FSCALE */
case 0x3D:
{
// TODO: NOT IMPLEMENTED
UNIMPLEMENTED;
LONGLONG Scale;
LONGLONG UnbiasedExp = (LONGLONG)((SHORT)FPU_ST(0).Exponent) - FPU_REAL10_BIAS;
FPU_SAVE_LAST_INST();
if (FPU_GET_TAG(0) == FPU_TAG_EMPTY || FPU_GET_TAG(1) == FPU_TAG_EMPTY)
{
State->FpuStatus.Ie = TRUE;
if (!State->FpuControl.Im) Fast486FpuException(State);
break;
}
if (!FPU_IS_NORMALIZED(&FPU_ST(0)))
{
State->FpuStatus.De = TRUE;
if (!State->FpuControl.Dm)
{
Fast486FpuException(State);
break;
}
}
if (!Fast486FpuToInteger(State, &FPU_ST(1), &Scale))
{
/* Exception occurred */
break;
}
/* Adjust the unbiased exponent */
UnbiasedExp += Scale;
/* Check for underflow */
if (UnbiasedExp < -1023)
{
/* Raise the underflow exception */
State->FpuStatus.Ue = TRUE;
if (State->FpuControl.Um)
{
/* Make the result zero */
FPU_ST(0) = FpuZero;
FPU_UPDATE_TAG(0);
}
else
{
Fast486FpuException(State);
}
break;
}
/* Check for overflow */
if (UnbiasedExp > 1023)
{
/* Raise the overflow exception */
State->FpuStatus.Oe = TRUE;
if (State->FpuControl.Om)
{
/* Make the result infinity */
FPU_ST(0).Mantissa = FPU_MANTISSA_HIGH_BIT;
FPU_ST(0).Exponent = FPU_MAX_EXPONENT + 1;
FPU_UPDATE_TAG(0);
}
else
{
Fast486FpuException(State);
}
break;
}
FPU_ST(0).Exponent = (USHORT)(UnbiasedExp + FPU_REAL10_BIAS);
FPU_UPDATE_TAG(0);
break;
}
@ -1901,6 +2013,25 @@ FAST486_OPCODE_HANDLER(Fast486FpuOpcodeD9)
{
FPU_SAVE_LAST_INST();
if (FPU_GET_TAG(0) == FPU_TAG_EMPTY)
{
State->FpuStatus.Ie = TRUE;
if (!State->FpuControl.Im) Fast486FpuException(State);
break;
}
if (!FPU_IS_NORMALIZED(&FPU_ST(0)))
{
State->FpuStatus.De = TRUE;
if (!State->FpuControl.Dm)
{
Fast486FpuException(State);
break;
}
}
Fast486FpuCalculateSine(State, &FPU_ST(0), &FPU_ST(0));
FPU_UPDATE_TAG(0);
@ -1912,6 +2043,25 @@ FAST486_OPCODE_HANDLER(Fast486FpuOpcodeD9)
{
FPU_SAVE_LAST_INST();
if (FPU_GET_TAG(0) == FPU_TAG_EMPTY)
{
State->FpuStatus.Ie = TRUE;
if (!State->FpuControl.Im) Fast486FpuException(State);
break;
}
if (!FPU_IS_NORMALIZED(&FPU_ST(0)))
{
State->FpuStatus.De = TRUE;
if (!State->FpuControl.Dm)
{
Fast486FpuException(State);
break;
}
}
Fast486FpuCalculateCosine(State, &FPU_ST(0), &FPU_ST(0));
FPU_UPDATE_TAG(0);