## divss - divide scalar double (64 bit floating point)

    dest = dest / source

The divsd instruction divides the source value (second operand) into the destination (an XMM register). The source can be an XMM register or a 64 bit memory location. There is also vdivsd on CPUs with AVX instructions which allows using 3 XMM registers or 2 XMM registers and a memory location which can simplify coding.

            divsd   xmm0, xmm1          ; divide xmm0 by xmm1
                                        ; leave the rest of xmm0 as is
            divsd   xmm0, [x]           ; divide xmm0 by 32 bit variable x
                                        ; leave the rest of xmm0 as is
            divsd   xmm0, [rdi]         ; divide xmm0 by 32 bit value [rdi]
                                        ; rdi holds the address of a float
                                        ; leave the rest of xmm0 as is
            divsd   xmm0, [x+4*rcx]     ; divide xmm0 by 32 bit element of array x
                                        ; rcx contains the array index
                                        ; leave the rest of xmm0 as is
            vdivsd  xmm3, xmm0, xmm15   ; xmm3 = xmm0 / xmm15

                ; Note: operates by copying 128 bits from xmm0 to xmm3
                ; before dividing.  This might occasionally be useful.
                ; The rest of ymm0 is left as is
                ; using divsd would change either xmm0 or xmm15
                ; possibly requiring an additional instruction

            vdivsd  xmm3, xmm0, [x]     ; xmm3 = xmm0 / x

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