$6\mathrm{.}4$ Consider the following piece of C code: for $($j$=2$;j$<1000$;j$++)$ D$[$j$]=$ D$[$j$1]+$D$[$j$2]$;

Th e MIPS code corresponding to the above fragment is: addiu $s$2,$$zero,$7992$ addiu $s$1,$$zero,$16$ loop: l$.$d $f$0,16($$s$1)$ l$.$d $f$2,8($$s$1)$ add.d $f$4,$ $f$0,$ $f$2$ s$.$d $f$4,0($$s$1)$ addiu $s$1,$ $s$1,8$ bne $s$1,$ $s$2,$ loop Instructions have the following associated latencies $($in cycles$)$: add.d l$.$d s$.$d addiu $4612$

$6\mathrm{.}4\mathrm{.}1[10]<6\mathrm{.}2>$ How many cycles does it take for all instructions in a single iteration of the above loop to execute?

$6\mathrm{.}4\mathrm{.}2[10]<6\mathrm{.}2>$ When an instruction in a later iteration of a loop depends upon a data value produced in an earlier iteration of the same loop, we say that there is a loop carried dependence between iterations of the loop. Identify the loop$-$carried dependences in the above code. Identify the dependent program variable and assembly$-$level registers. You can ignore the loop induction variable j$.$