On 2009-10-28, Petter Urkedal wrote:
> ====== ====== ====== ==================
> bop moda modb final instructions
> ====== ====== ====== ==================
> and not_x not_y and, andn, nor
> nand not_x not_y nand, orn, or
> xor [?] not_y xorn
> add [?] neg_x sub [1]
> shift s/u neg_x lsl, lsr, asl, asr [1]
> mul [?] [?] mul
> min s/u not_xy smin, smax, umin, umax [2]
Sorry, a got the modb for "add" and "shift" wrong. The table should be
====== ====== ====== ==================
bop moda modb final instructions
====== ====== ====== ==================
and not_x not_y and, andn, nor
nand not_x not_y nand, orn, or
xor [?] not_y xorn
add [?] neg_y sub [1]
shift s/u neg_y lsl, lsr, asl, asr [1]
mul [?] [?] mul
min s/u not_xy smin, smax, umin, umax [2]
Also,
> neg_x -- inversion of the x operand
neg_y -- inversion of the x operand
On second though we may as well follow Yann's suggestion on min/max
distinction rather than negating the inputs to add/sub:
min s/u min/max smin, smax, umin, umax [2]
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