Intel ITANIUM ARCHITECTURE - SOFTWARE DEVELOPERS MANUAL VOLUME 1 REV 2.3 Manual page 1415

FCOM/FCOMP/FCOMPP—Compare Real (Continued)
Operation
CASE (relation of operands) OF
ST > SRC:
ST < SRC:
ST = SRC:
ESAC;
IF ST(0) or SRC = NaN or unsupported format
THEN
#IA
IF FPUControlWord.IM = 1
FI;
FI;
IF instruction = FCOMP
THEN
PopRegisterStack;
FI;
IF instruction = FCOMPP
THEN
PopRegisterStack;
PopRegisterStack;
FI;
FPU Flags Affected
C1
C0, C2, C3
Additional Itanium System Environment Exceptions
Itanium Reg Faults Disabled FP Register Fault if PSR.dfl is 1, NaT Register Consumption
Itanium Mem FaultsVHPT Data Fault, Nested TLB Fault, Data TLB Fault, Alternate Data
Floating-point Exceptions
#IS
#IA
#D
Volume 4: Base IA-32 Instruction Reference
C3, C2, C0  000;
C3, C2, C0  001;
C3, C2, C0  100;
THEN
C3, C2, C0  111;
Set to 0 if stack underflow occurred; otherwise, cleared to 0.
See table on previous page.
Abort.
TLB Fault, Data Page Not Present Fault, Data NaT Page Consumption
Abort, Data Key Miss Fault, Data Key Permission Fault, Data Access
Rights Fault, Data Access Bit Fault, Data Dirty Bit Fault
Stack underflow occurred.
One or both operands are NaN values or have unsupported formats.
Register is marked empty.
One or both operands are denormal values.
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