Intel ITANIUM ARCHITECTURE - SOFTWARE DEVELOPERS MANUAL VOLUME 1 REV 2.3 Manual page 1793

CMPPS: Packed Single-FP Compare (Continued)
Predicate Description
eq equal
lt less-than
le less-than-or-equal
greater than
greater-than-or-equal
unord unordered
neq not-equal
nlt not-less-than
nle not-less-than-or-equal
not-greater-than
not-greater-than-or-equal
ord ordered
a. The greater-than, greater-than-or-equal, not-greater-than, and not-greater-than-or-equal relations are not directly implemented
in hardware.
General protection exception if not aligned on 16-byte boundary, regardless of
FP Exceptions:
segment.
Invalid if sNaN operand, invalid if qNaN and predicate as listed in above table,
Numeric Exceptions:
denormal.
Protected Mode Exceptions:
#GP(0) for an illegal memory operand effective address in the CS, DS, ES, FS or GS
segments; #SS(0) for an illegal address in the SS segment; #PF(fault-code) for a page
fault; #UD if CR0.EM = 1; #NM if TS bit in CR0 is set. #XM for an unmasked SSE
numeric exception (CR4.OSXMMEXCPT =1); #UD for an unmasked SSE numeric
exception (CR4.OSXMMEXCPT =0); #UD if CRCR4.OSFXSR(bit 9) = 0; #UD if
CPUID.XMM(EDX bit 25) = 0.
Real Address Mode Exceptions:
Interrupt 13 if any part of the operand would lie outside of the effective address space
from 0 to 0FFFFH; #UD if CR0.EM = 1; #NM if TS bit in CR0 is set; #XM for an
unmasked SSE numeric exception (CR4.OSXMMEXCPT =1); #UD for an unmasked SSE
numeric exception (CR4.OSXMMEXCPT =0); #UD if CRCR4.OSFXSR(bit 9) = 0; #UD if
CPUID.XMM(EDX bit 25) = 0.
Virtual 8086 Mode Exceptions:
Same exceptions as in Real Address Mode; #PF(fault-code) for a page fault.
Volume 4: IA-32 SSE Instruction Reference
a
Relation
xmm1 == xmm2
xmm1 < xmm2
xmm1 <= xmm2
xmm1 > xmm2
xmm1 >= xmm2
xmm1 ? xmm2
!(xmm1 == xmm2)
!(xmm1 < xmm2)
!(xmm1 <= xmm2)
!(xmm1 > xmm2)
!(xmm1 >= xmm2)
!(xmm1 ? xmm2)
imm8
Emulation
Encoding
000B
001B
010B
swap, protect, lt
swap protect, le
011B
100B
101B
110B
swap, protect, nlt
swap, protect, nle
111B
QNaN
Result if
Operand
NaN
Signals
Operand
Invalid
False No
False Yes
False Yes
False Yes
False Yes
True No
True No
True Yes
True Yes
True Yes
True Yes
False No
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