[aandrejevic] 67828: [FAST486] Fix Fast486FpuArithmeticOperation. It doesn't really matter for the operation itself which operand is the source/destination, because the FPU actually always performs...
19 May
2015
19 May
'15
4:57 p.m.
Author: aandrejevic
Date: Tue May 19 16:57:46 2015
New Revision: 67828
URL: http://svn.reactos.org/svn/reactos?rev=67828&view=rev
Log:
[FAST486]
Fix Fast486FpuArithmeticOperation. It doesn't really matter for the operation
itself which operand is the source/destination, because the FPU actually
always performs the operation on ST0 and something else. So, FDIV/FDIVR were
never really reversed here, it's just that FDIV always divides ST0 by something
and FDIVR always divides something by ST0.
Modified:
trunk/reactos/lib/fast486/fpu.c
Modified: trunk/reactos/lib/fast486/fpu.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/lib/fast486/fpu.c?rev=6782…
==============================================================================
--- trunk/reactos/lib/fast486/fpu.c [iso-8859-1] (original)
+++ trunk/reactos/lib/fast486/fpu.c [iso-8859-1] Tue May 19 16:57:46 2015
@@ -1273,9 +1273,11 @@
static inline VOID FASTCALL
Fast486FpuArithmeticOperation(PFAST486_STATE State,
INT Operation,
- PFAST486_FPU_DATA_REG SourceOperand,
- PFAST486_FPU_DATA_REG DestOperand)
+ PFAST486_FPU_DATA_REG Operand,
+ BOOLEAN TopDestination)
{
+ PFAST486_FPU_DATA_REG DestOperand = TopDestination ? &FPU_ST(0) : Operand;
+
ASSERT(!(Operation & ~7));
/* Check the operation */
@@ -1284,14 +1286,14 @@
/* FADD */
case 0:
{
- Fast486FpuAdd(State, DestOperand, SourceOperand, DestOperand);
+ Fast486FpuAdd(State, &FPU_ST(0), Operand, DestOperand);
break;
}
/* FMUL */
case 1:
{
- Fast486FpuMultiply(State, DestOperand, SourceOperand, DestOperand);
+ Fast486FpuMultiply(State, &FPU_ST(0), Operand, DestOperand);
break;
}
@@ -1300,7 +1302,7 @@
/* FCOMP */
case 3:
{
- Fast486FpuCompare(State, DestOperand, SourceOperand);
+ Fast486FpuCompare(State, &FPU_ST(0), Operand);
if (Operation == 3) Fast486FpuPop(State);
break;
@@ -1309,28 +1311,28 @@
/* FSUB */
case 4:
{
- Fast486FpuSubtract(State, DestOperand, SourceOperand, DestOperand);
+ Fast486FpuSubtract(State, &FPU_ST(0), Operand, DestOperand);
break;
}
/* FSUBR */
case 5:
{
- Fast486FpuSubtract(State, SourceOperand, DestOperand, DestOperand);
+ Fast486FpuSubtract(State, Operand, &FPU_ST(0), DestOperand);
break;
}
/* FDIV */
case 6:
{
- Fast486FpuDivide(State, SourceOperand, DestOperand, DestOperand);
+ Fast486FpuDivide(State, &FPU_ST(0), Operand, DestOperand);
break;
}
/* FDIVR */
case 7:
{
- Fast486FpuDivide(State, DestOperand, SourceOperand, DestOperand);
+ Fast486FpuDivide(State, Operand, &FPU_ST(0), DestOperand);
break;
}
}
@@ -1425,7 +1427,7 @@
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
#ifndef FAST486_NO_FPU
- PFAST486_FPU_DATA_REG SourceOperand, DestOperand;
+ PFAST486_FPU_DATA_REG Operand;
FAST486_FPU_DATA_REG MemoryData;
#endif
@@ -1444,9 +1446,6 @@
FPU_SAVE_LAST_INST();
- /* The destination operand is ST0 */
- DestOperand = &FPU_ST(0);
-
if (FPU_GET_TAG(0) == FPU_TAG_EMPTY)
{
/* Raise the invalid operation exception */
@@ -1455,9 +1454,9 @@
if (State->FpuControl.Im)
{
/* Return the indefinite NaN */
- DestOperand->Sign = TRUE;
- DestOperand->Exponent = FPU_MAX_EXPONENT + 1;
- DestOperand->Mantissa = FPU_INDEFINITE_MANTISSA;
+ FPU_ST(0).Sign = TRUE;
+ FPU_ST(0).Exponent = FPU_MAX_EXPONENT + 1;
+ FPU_ST(0).Mantissa = FPU_INDEFINITE_MANTISSA;
FPU_SET_TAG(0, FPU_TAG_SPECIAL);
}
@@ -1478,7 +1477,7 @@
}
Fast486FpuFromSingleReal(State, Value, &MemoryData);
- SourceOperand = &MemoryData;
+ Operand = &MemoryData;
FPU_SAVE_LAST_OPERAND();
}
@@ -1492,9 +1491,9 @@
if (State->FpuControl.Im)
{
/* Return the indefinite NaN */
- DestOperand->Sign = TRUE;
- DestOperand->Exponent = FPU_MAX_EXPONENT + 1;
- DestOperand->Mantissa = FPU_INDEFINITE_MANTISSA;
+ FPU_ST(0).Sign = TRUE;
+ FPU_ST(0).Exponent = FPU_MAX_EXPONENT + 1;
+ FPU_ST(0).Mantissa = FPU_INDEFINITE_MANTISSA;
FPU_SET_TAG(0, FPU_TAG_SPECIAL);
}
@@ -1504,11 +1503,11 @@
}
/* Load the source operand from an FPU register */
- SourceOperand = &FPU_ST(ModRegRm.SecondRegister);
+ Operand = &FPU_ST(ModRegRm.SecondRegister);
}
/* Perform the requested operation */
- Fast486FpuArithmeticOperation(State, ModRegRm.Register, SourceOperand, DestOperand);
+ Fast486FpuArithmeticOperation(State, ModRegRm.Register, Operand, TRUE);
#endif
}
@@ -2291,7 +2290,6 @@
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
#ifndef FAST486_NO_FPU
- PFAST486_FPU_DATA_REG SourceOperand, DestOperand;
LONG Value;
FAST486_FPU_DATA_REG MemoryData;
#endif
@@ -2348,9 +2346,6 @@
return;
}
- /* The destination operand is always ST0 */
- DestOperand = &FPU_ST(0);
-
if (FPU_GET_TAG(0) == FPU_TAG_EMPTY)
{
/* Raise the invalid operation exception */
@@ -2359,9 +2354,9 @@
if (State->FpuControl.Im)
{
/* Return the indefinite NaN */
- DestOperand->Sign = TRUE;
- DestOperand->Exponent = FPU_MAX_EXPONENT + 1;
- DestOperand->Mantissa = FPU_INDEFINITE_MANTISSA;
+ FPU_ST(0).Sign = TRUE;
+ FPU_ST(0).Exponent = FPU_MAX_EXPONENT + 1;
+ FPU_ST(0).Mantissa = FPU_INDEFINITE_MANTISSA;
FPU_SET_TAG(0, FPU_TAG_SPECIAL);
}
@@ -2371,10 +2366,9 @@
}
Fast486FpuFromInteger(State, (LONGLONG)Value, &MemoryData);
- SourceOperand = &MemoryData;
/* Perform the requested operation */
- Fast486FpuArithmeticOperation(State, ModRegRm.Register, SourceOperand, DestOperand);
+ Fast486FpuArithmeticOperation(State, ModRegRm.Register, &MemoryData, TRUE);
#endif
}
@@ -2614,7 +2608,7 @@
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
#ifndef FAST486_NO_FPU
- PFAST486_FPU_DATA_REG SourceOperand, DestOperand;
+ PFAST486_FPU_DATA_REG Operand;
FAST486_FPU_DATA_REG MemoryData;
#endif
@@ -2637,9 +2631,6 @@
{
ULONGLONG Value;
- /* The destination operand is ST0 */
- DestOperand = &FPU_ST(0);
-
if (FPU_GET_TAG(0) == FPU_TAG_EMPTY)
{
/* Raise the invalid operation exception */
@@ -2648,9 +2639,9 @@
if (State->FpuControl.Im)
{
/* Return the indefinite NaN */
- DestOperand->Sign = TRUE;
- DestOperand->Exponent = FPU_MAX_EXPONENT + 1;
- DestOperand->Mantissa = FPU_INDEFINITE_MANTISSA;
+ FPU_ST(0).Sign = TRUE;
+ FPU_ST(0).Exponent = FPU_MAX_EXPONENT + 1;
+ FPU_ST(0).Mantissa = FPU_INDEFINITE_MANTISSA;
FPU_SET_TAG(0, FPU_TAG_SPECIAL);
}
@@ -2673,17 +2664,14 @@
}
Fast486FpuFromDoubleReal(State, Value, &MemoryData);
- SourceOperand = &MemoryData;
+ Operand = &MemoryData;
FPU_SAVE_LAST_OPERAND();
}
else
{
- /* The source operand is ST0 */
- SourceOperand = &FPU_ST(0);
-
/* Load the destination operand from an FPU register */
- DestOperand = &FPU_ST(ModRegRm.SecondRegister);
+ Operand = &FPU_ST(ModRegRm.SecondRegister);
if ((FPU_GET_TAG(0) == FPU_TAG_EMPTY)
|| (FPU_GET_TAG(ModRegRm.SecondRegister) == FPU_TAG_EMPTY))
@@ -2694,9 +2682,9 @@
if (State->FpuControl.Im)
{
/* Return the indefinite NaN */
- DestOperand->Sign = TRUE;
- DestOperand->Exponent = FPU_MAX_EXPONENT + 1;
- DestOperand->Mantissa = FPU_INDEFINITE_MANTISSA;
+ Operand->Sign = TRUE;
+ Operand->Exponent = FPU_MAX_EXPONENT + 1;
+ Operand->Mantissa = FPU_INDEFINITE_MANTISSA;
FPU_SET_TAG(ModRegRm.SecondRegister, FPU_TAG_SPECIAL);
}
@@ -2707,7 +2695,7 @@
}
/* Perform the requested operation */
- Fast486FpuArithmeticOperation(State, ModRegRm.Register, SourceOperand, DestOperand);
+ Fast486FpuArithmeticOperation(State, ModRegRm.Register, Operand, ModRegRm.Memory);
#endif
}
@@ -2992,7 +2980,7 @@
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
#ifndef FAST486_NO_FPU
- PFAST486_FPU_DATA_REG SourceOperand, DestOperand;
+ PFAST486_FPU_DATA_REG Operand;
FAST486_FPU_DATA_REG MemoryData;
#endif
@@ -3015,9 +3003,6 @@
{
SHORT Value;
- /* The destination operand is ST0 */
- DestOperand = &FPU_ST(0);
-
if (FPU_GET_TAG(0) == FPU_TAG_EMPTY)
{
/* Raise the invalid operation exception */
@@ -3026,9 +3011,9 @@
if (State->FpuControl.Im)
{
/* Return the indefinite NaN */
- DestOperand->Sign = TRUE;
- DestOperand->Exponent = FPU_MAX_EXPONENT + 1;
- DestOperand->Mantissa = FPU_INDEFINITE_MANTISSA;
+ FPU_ST(0).Sign = TRUE;
+ FPU_ST(0).Exponent = FPU_MAX_EXPONENT + 1;
+ FPU_ST(0).Mantissa = FPU_INDEFINITE_MANTISSA;
FPU_SET_TAG(0, FPU_TAG_SPECIAL);
}
@@ -3045,7 +3030,7 @@
}
Fast486FpuFromInteger(State, (LONGLONG)Value, &MemoryData);
- SourceOperand = &MemoryData;
+ Operand = &MemoryData;
FPU_SAVE_LAST_OPERAND();
}
@@ -3059,11 +3044,8 @@
return;
}
- /* The source operand is ST0 */
- SourceOperand = &FPU_ST(0);
-
/* Load the destination operand from a register */
- DestOperand = &FPU_ST(ModRegRm.SecondRegister);
+ Operand = &FPU_ST(ModRegRm.SecondRegister);
if ((FPU_GET_TAG(0) == FPU_TAG_EMPTY)
|| (FPU_GET_TAG(ModRegRm.SecondRegister) == FPU_TAG_EMPTY))
@@ -3077,7 +3059,7 @@
}
/* Perform the requested operation */
- Fast486FpuArithmeticOperation(State, ModRegRm.Register, SourceOperand, DestOperand);
+ Fast486FpuArithmeticOperation(State, ModRegRm.Register, Operand, ModRegRm.Memory);
if (!ModRegRm.Memory) Fast486FpuPop(State);
#endif
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