JCL Help:Get8087StatusWord
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Summary
Returns the 80x87 status word.
Pascal
function Get8087StatusWord(ClearExceptions: Boolean): Word;
Parameters
| Parameters | Description |
| ClearExceptions: Boolean | If True the function clears any pending floating point exceptions before returning the status word. If False the function does not clear pending exceptions (it's the difference between using FSTSW and FNSTSW). |
Return Value
Returns the contents of the 80x87 status word.
| Bit(s) | Description |
| 0 (IE) | Invalid error such as stack overflow/underflow. |
| 1 (DE) | Denormalized error meaning at least one operand was denormalized. |
| 2 (ZE) | Zero error indicates the divisor was 0 while the dividend was non-zero or non-infinity. |
| 3 (OE) | Overflow error indicating the result of an operation was too large to be represented. If overflow error is masked a result of infinity was returned. |
| 4 (UE) | Underflow error indicating the result of an operation was too small to be represented. |
| 5 (PE) | Precision error indicating an operand or the result exceeds the selected precision. |
| 6 (SF) | Used in some newer coprocessors to denote overflow or underflow. |
| 7 (ES) | Error summary is set if any of the unmasked error bits is set. |
| 8-10, 14 (C0-C2,C3) | Condition code bits indicate certain conditions such as NAN. These are opcode dependent. See the Intel reference. |
| 11-13 (TOP) | Stack top pointer. Register which functions as top of stack, usually 0. |
| 15 (B) | Busy bit indicating the coprocessor is performing some task. |
Description
Get8087StatusWord returns the 80x87 status word. This is the FPU's register that reflects it's overall status. The meaning of the individual bits are documented in the table below.
See Also
Set8087ControlWord Get8087ControlWord
About
Unit
Donator
Marcel van Brakel
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