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FISTTP
Stores the floating-point value from ST(0) as a truncated 32-bit signed integer to the specified destination, then pops the floating-point stack.
The table after the description covers what the source and destinations can be.
| source | destination(s) |
|---|---|
| ST(0) | m32 |
| ST(0) | r32 |
DO NOT support LOCK
This instruction is available in 64-bit mode and compatibility mode. It requires the use of the x87 FPU register set.
The destination MUST be aligned to the appropriate size boundary to avoid performance penalties or alignment faults depending on the processor configuration. If the result of the truncation exceeds the range of a 32-bit signed integer, a #O exception SHALL be generated. Any precision loss during truncation SHALL trigger a #P exception.