MIPS体系结构提供了32个GPR(GENERAL PURPOSE REGISTER)。这32个寄存器的用法大致如下:
REGISTER NAME USAGE
$0 $zero 常量0(constant value 0)
$2-$3 $v0-$v1 函数调用返回值(values for results and expression evaluation)
$4-$7 $a0-$a3 函数调用参数(arguments)
$8-$15 $t0-$t7 暂时的(或随便用的)
$16-$23 $s0-$s7 保存的(或如果用,需要SAVE/RESTORE的)(saved)
$24-$25 $t8-$t9 暂时的(或随便用的)
$28 $gp 全局指针(Global Pointer)
$29 $sp 堆栈指针(Stack Pointer)
$30 $fp 帧指针(Frame Pointer)
(BNN:fp is stale acutally, and can be simply used as $t8)
$31 $ra 返回地址(return address)
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