C语言的汇编实现（三）条件跳转

C源代码：

int con(int x , int y)
{
        int result;
        if(x < y)
                result = y -x;
        else
                result = x - y;

        return result;
}

gcc -Og con.c -S

汇编代码

con:
    .frame    $sp,0,$31        # vars= 0, regs= 0/0, args= 0, gp= 0
    .mask    0x00000000,0
    .fmask    0x00000000,0
    .set    noreorder
    .set    nomacro
    slt    $24,$4,$5  # 如果第一个入参小于第二个入参，则置临时变量$24为1
    beq    $24,$0,$L2  #如果$24为0，则返回x-y
    nop

    j    $31
    subu    $2,$5,$4  #如果$24为1，则返回y-x

$L2:
    j    $31
    subu    $2,$4,$5

mips的跳转指令如下
b target # unconditional branch to program label target
beq $t0,$t1,target # branch to target if $t0 = $t1
blt $t0,$t1,target # branch to target if $t0 < $t1
ble $t0,$t1,target # branch to target if $t0 <= $t1
bgt $t0,$t1,target # branch to target if $t0 > $t1
bge $t0,$t1,target # branch to target if $t0 >= $t1
bne $t0,$t1,target # branch to target if $t0 <> $t1