Instruction |
Description |
|---|---|
|
FISTTP m16int |
Store ST as a signed integer (truncate) in m16int and pop ST. |
|
FISTTP m32int |
Store ST as a signed integer (truncate) in m32int and pop ST. |
|
FISTTP m64int |
Store ST as a signed integer (truncate) in m64int and pop ST. |
FISTTP converts the value in ST into a signed integer using truncation (chop) as rounding mode, transfers the result to the destination, and pop ST. FISTTP accepts word, short integer, and long integer destinations.
The following table shows the results obtained when storing various classes of numbers in integer format.
Note F Means finite floating-point value.
I Means integer.
* Indicates floating-point invalid-operation (#IA) exception.
DEST ยจ ST;
pop ST;
C1 is cleared; C0, C2, C3 undefined.
Invalid, Stack Invalid (stack underflow), Precision.
#GP(0) If the destination is in a nonwritable segment.
For an illegal memory operand effective address in the CS, DS, ES, FS or GS segments.
#SS(0) For an illegal address in the SS segment.
#PF(fault-code) For a page fault.
#AC For unaligned memory reference if the current privilege level is 3.
#NM If CR0.EM = 1.
If TS bit in CR0 is set.
#UD If CPUID.PNI(ECX bit 0) = 0.
Interrupt 13 If any part of the operand would lie outside of the effective address space from 0 to 0FFFFH.
#NM If CR0.EM = 1.
If TS bit in CR0 is set.
#UD If CPUID.PNI(ECX bit 0) = 0.
Interrupt 13 If any part of the operand would lie outside of the effective address space from 0 to 0FFFFH.
#NM If CR0.EM = 1.
If TS bit in CR0 is set.
#UD If CPUID.PNI(ECX bit 0) = 0.
#PF(fault-code) For a page fault.
#AC For unaligned memory reference if the current privilege is 3.
For details, see Volume 2A and Volume 2B of the Intel(R) 64 and IA-32 Intel Architecture Software Developer's Manual. For the latest updates on the instruction set information, go to the web site.