JCL Help:Get8087ControlWord
JCL Help: Get8087ControlWord Function
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Summary
Returns the 80x87 control word.
Pascal
function Get8087ControlWord: Word;
Return Value
Returns the 80x87 control word.
Description
Get8087ControlWord returns the 80x87 control word (register). This is the FPU's register that controls how the FPU operates with regard to things such as precision, rounding and infinity control. See the table below for the meaning of the individual bits. Note that although this routine might be handy at times, the Get8087Infinity, Get8087Precision and Get8087Rounding functions are preferred as they shield you from the low level bit manipulation.
| Bit(s) | Description |
| 0 (IM) | Invalid operation mask |
| 1 (DM) | Denormalized operand mask |
| 2 (ZM) | Division by zero mask |
| 3 (OM) | Overflow mask |
| 4 (UM) | Underflow mask |
| 5 (PM) | Precision error mask |
| 8,9 (PC) | Precision control * 00 Single precision * 01 |
| Reserved * 10 Double precision * 11 Extended | |
| precision | |
| 10,11 (RC) | Rounding control * 00 Round to nearest or even * 01 |
| Round down * 10 Round up * Chop or truncate toward 0 | |
| 12 (IC) | Infinity control * 0 projective * 1 affine |
See Also
Get8087StatusWord Set8087ControlWord
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