Intel ITANIUM ARCHITECTURE - SOFTWARE DEVELOPERS MANUAL VOLUME 1 REV 2.3 Manual page 1468

FSCALE—Scale (Continued)
Operation
ST(0)  ST(0) 2
FPU Flags Affected
C1
C0, C2, C3
Floating-point Exceptions
#IS
#IA
#D
#U
#O
#P
Additional Itanium System Environment Exceptions
Itanium Reg Faults Disabled FP Register Fault if PSR.dfl is 1, NaT Register Consumption
Protected Mode Exceptions
#NM
Real Address Mode Exceptions
#NM
Virtual 8086 Mode Exceptions
#NM
4:166
ST(1)
;
Set to 0 if stack underflow occurred.
Indicates rounding direction if the inexact-result exception (#P) is
generated: 0 = not roundup; 1 = roundup.
Undefined.
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.
Result is too large for destination format.
Value cannot be represented exactly in destination format.
Abort.
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