CMPccSS
Usage: CMPccSS dest,src,cmppred Modifies flags: None
Compares the low-order single-precision FP values in the 'src' and 'dest' operands, and returns the result in the 'dest' register. The result of each comparison is a doubleword mask of all 1s (true) or all 0s (false).
Scalar Single-Precision FP Compare
CMPEQSS CMPLTSS CMPLESS CMPUNORDSS CMPNEQSS CMPNLTSS CMPNLESS CMPORDSS
CMPSS xmm1,xmm2/mem32,imm8 ; F3 0F C2 /r ib [KATMAI,SSE]
CMPEQSS xmm1,xmm2/mem32 ; F3 0F C2 /r 00 [KATMAI,SSE]
CMPLTSS xmm1,xmm2/mem32 ; F3 0F C2 /r 01 [KATMAI,SSE]
CMPLESS xmm1,xmm2/mem32 ; F3 0F C2 /r 02 [KATMAI,SSE]
CMPUNORDSS xmm1,xmm2/mem32 ; F3 0F C2 /r 03 [KATMAI,SSE]
CMPNEQSS xmm1,xmm2/mem32 ; F3 0F C2 /r 04 [KATMAI,SSE]
CMPNLTSS xmm1,xmm2/mem32 ; F3 0F C2 /r 05 [KATMAI,SSE]
CMPNLESS xmm1,xmm2/mem32 ; F3 0F C2 /r 06 [KATMAI,SSE]
CMPORDSS xmm1,xmm2/mem32 ; F3 0F C2 /r 07 [KATMAI,SSE]
Compares the low single-precision floating-point values in the 'src' operand and the 'dest' first operand and returns the results of the comparison to the 'dest' operand. The 'comparison predicate' operand (third operand) specifies the type of comparison performed. The comparison result is a doubleword mask of all 1s (comparison true) or all 0s (comparison false). The result is stored in the low doubleword of the 'dest' operand; the 3 high-order doublewords remain unchanged. The 'comparison predicate' operand is an 8-bit immediate the first 3 bits of which define the type of comparison to be made bits 4 through 7 of the immediate are reserved.
The destination is an XMM register. The source can be either an XMM register or a 128-bit memory location.
The third operand is an 8-bit immediate value, of which the low 3 bits define the type of comparison. For ease of programming, the 8 two-operand pseudo-instructions are provided, with the third operand already filled in.
The Condition Predicates are:
EQ 0 Equal
LT 1 Less-than
LE 2 Less-than-or-equal
UNORD 3 Unordered
NE 4 Not-equal
NLT 5 Not-less-than
NLE 6 Not-less-than-or-equal
ORD 7 Ordered
For more details of the comparison predicates, and details of how to emulate the 'greater-than' equivalents, see SSE-cc
EXAMPLE:
cmpss xmm1 xmm2 1