CMPccSD
Usage: CMPccSD dest,src,cmppred Modifies flags: None
Compares the low-order double-precision FP values in the 'src' and 'dest' operands, and returns the result in the 'dest' register. The result of each comparison is a quadword mask of all 1s (true) or all 0s (false).
Scalar Double-Precision FP Compare
CMPEQSD CMPLTSD CMPLESD CMPUNORDSD CMPNEQSD CMPNLTSD CMPNLESD CMPORDSD
CMPSD xmm1,xmm2/mem64,imm8 ; F2 0F C2 /r ib [WILLAMETTE,SSE2]
CMPEQSD xmm1,xmm2/mem64 ; F2 0F C2 /r 00 [WILLAMETTE,SSE2]
CMPLTSD xmm1,xmm2/mem64 ; F2 0F C2 /r 01 [WILLAMETTE,SSE2]
CMPLESD xmm1,xmm2/mem64 ; F2 0F C2 /r 02 [WILLAMETTE,SSE2]
CMPUNORDSD xmm1,xmm2/mem64 ; F2 0F C2 /r 03 [WILLAMETTE,SSE2]
CMPNEQSD xmm1,xmm2/mem64 ; F2 0F C2 /r 04 [WILLAMETTE,SSE2]
CMPNLTSD xmm1,xmm2/mem64 ; F2 0F C2 /r 05 [WILLAMETTE,SSE2]
CMPNLESD xmm1,xmm2/mem64 ; F2 0F C2 /r 06 [WILLAMETTE,SSE2]
CMPORDSD xmm1,xmm2/mem64 ; F2 0F C2 /r 07 [WILLAMETTE,SSE2]
Compares the low double-precision floating-point values in the 'src' operand and the 'dest' 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 quadword mask of all 1s (comparison true) or all 0s (comparison false). 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:
cmpsd xmm1 xmm2 5