Intel ITANIUM ARCHITECTURE - SOFTWARE DEVELOPERS MANUAL VOLUME 1 REV 2.3 Manual page 1452

FPATAN—Partial Arctangent (Continued)
Floating-point Exceptions
#IS
#IA
#D
#U
#P
Protected Mode Exceptions
#NM
Real Address Mode Exceptions
#NM
Virtual 8086 Mode Exceptions
#NM
Intel Architecture Compatibility Information
The source operands for this instruction are restricted for the 80287 math coprocessor
to the following range:
0  |ST(1)|  |ST(0)|  
4:150
Stack underflow occurred.
Source operand is an SNaN value or unsupported format.
Source operand is a denormal value.
Result is too small for destination format.
Value cannot be represented exactly in destination format.
EM or TS in CR0 is set.
EM or TS in CR0 is set.
EM or TS in CR0 is set.
Volume 4: Base IA-32 Instruction Reference