3-230
INSTRUCTION SET REFERENCE
FPTAN—Partial Tangent (Continued)
Operation
IF ST(0)
<
2
63
THEN
C2
<
0;
ST(0)
<
tan(ST(0));
TOP
<
TOP
?
1;
ST(0)
<
1.0;
ELSE (*source operand is out-of-range *)
C2
<
1;
FI;
FPU Flags Affected
C1
Set to 0 if stack underflow occurred; set to 1 if stack overflow occurred.
Indicates rounding direction if the inexact result exception (#P) is gener-
ated: 0 = not roundup; 1 = roundup.
C2
Set to 1 if source operand is outside the range
?
2
63
to +2
63
; otherwise,
cleared to 0.
C0, C3
Undefined.
Floating-Point Exceptions
#IS
Stack underflow occurred.
#IA
Source operand is an sNaN value,
?
, or unsupported format.
#D
Source operand is a denormal value.
#U
Result is too small 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.
