assembly - 手臂汇编 if(表达式 && 表达式)

Question

在 ARM 汇编中执行此操作的最优雅的方法是什么？

If(x0 == x1 && y0 == y1)
  {
    ...
  }

假设所有值都已经在寄存器中

equal:
  cmp r2, r3
  beq are_equal
  b not_equal
check: 
  cmp r0, r1
  beq equal
not_equal:

Answer 1

我在想这样的事情，但我必须再盯着它看……

cmp r2,r3
cmpeq r0,r1
bne skip
...
skip:

Answer 2

You could probably GCC generate some elegant code for you by doing this:

register int x0 asm ("r2");
register int x1 asm ("r3");
register int y0 asm ("r0");
register int y1 asm ("r1");
if(x0 == x1 && y0 == y1)
{
    ...
}

Compile this, then look at the disassembly.