3-290
INSTRUCTION SET REFERENCE
FYL2XP1Compute y
?
log
2
(x +1) (Continued)
Operation
ST(1)
<
ST(1)
?
log
2
(ST(0) + 1.0);
PopRegisterStack;
FPU Flags Affected
C1
Set to 0 if stack underflow occurred.
Indicates rounding direction if the inexact result exception (#P) is
generated: 0 = not roundup; 1 = roundup.
C0, C2, C3
Undefined.
Floating-Point Exceptions
#IS
Stack underflow occurred.
#IA
Either operand is an sNaN value or unsupported format.
#D
Source operand is a denormal value.
#U
Result is too small for destination format.
#O
Result is too large for destination format.
#P
Value cannot be represented exactly in destination format.
Protected Mode Exceptions
#NM
EM or TS in CR0 is set.
Real-Address Mode Exceptions
#NM
EM or TS in CR0 is set.
Virtual-8086 Mode Exceptions
#NM
EM or TS in CR0 is set.
