Match MIPS processor's register usage. $zero I Choose ] IChoose ] Stack pointer Return address Temporaries Frame pointer Reserved for OS kernel Global pointer Saved temporaries Assembler Temporary Values for function results& expression evaluation. Argument passing. constant O Sat $a0-$a3 $to-$t9 I Choose ] $s0-$s7 Choose ] ALIEN $to-$t9 I Choose ] $s0-$$7 IChoose ] Sk0-$k1 I Choose ] Sgp [Choose Ssp Choose Sfp I Choose ] Sra [Choose ALIENV