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Intel-x86 FPSR Register
The bit settings of the Intel-x86 FPSR register are outlined in the following table.
| Value |
Bit Setting |
Meaning |
| TOP=<i> |
0x3800 |
Register <i> is top of FPU stack |
| B |
0x8000 |
FPU busy |
| C0 |
0x0100 |
Condition bit 0 |
| C1 |
0x0200 |
Condition bit 1 |
| C2 |
0x0400 |
Condition bit 2 |
| C3 |
0x4000 |
Condition bit 3 |
| ES |
0x0080 |
Exception summary status |
| SF |
0x0040 |
Stack fault |
| EF=PE |
0x0020 |
Precision exception |
| EF=UE |
0x0010 |
Underflow exception |
| EF=OE |
0x0008 |
Overflow exception |
| EF=ZE |
0x0004 |
Zero divide exception |
| EF=DE |
0x0002 |
Denormalized operand exception |
| EF=IE |
0x0001 |
Invalid operation exception |
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