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INSTRUCTION SET REFERENCE
FBSTPStore BCD Integer and Pop (Continued)
Operation
DEST
<
BCD(ST(0));
PopRegisterStack;
FPU Flags Affected
C1
Set to 0 if stack underflow occurred.
Indicates rounding direction if the inexact exception (#P) is generated:
0= not roundup; 1 = roundup.
C0, C2, C3
Undefined.
Floating-Point Exceptions
#IS
Stack underflow occurred.
#IA
Source operand is empty; contains a NaN,
±
, or unsupported format; or
contains value that exceeds 18 BCD digits in length.
#P
Value cannot be represented exactly in destination format.
Protected Mode Exceptions
#GP(0)
If a segment register is being loaded with a segment selector that points to
a nonwritable segment.
If a memory operand effective address is outside the CS, DS, ES, FS, or
GS segment limit.
If the DS, ES, FS, or GS register contains a null segment selector.
#SS(0)
If a memory operand effective address is outside the SS segment limit.
#NM
EM or TS in CR0 is set.
#PF(fault-code)If a page fault occurs.
#AC(0)
If alignment checking is enabled and an unaligned memory reference is
made while the current privilege level is 3.
Real-Address Mode Exceptions
#GP
If a memory operand effective address is outside the CS, DS, ES, FS, or
GS segment limit.
#SS
If a memory operand effective address is outside the SS segment limit.
#NM
EM or TS in CR0 is set.
