void memcpy_fromio()

in lib/io.c [54:100]

• 39 lines of code
• 11 McCabe index (conditional complexity)

void memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
{
	/* first compare alignment of src/dst */ 
	if ( (((unsigned long)dst ^ (unsigned long)src) & 1) || (count < 2) )
		goto bytecopy;

	if ( (((unsigned long)dst ^ (unsigned long)src) & 2) || (count < 4) )
		goto shortcopy;

	/* Then check for misaligned start address */
	if ((unsigned long)src & 1) {
		*(u8 *)dst = readb(src);
		src++;
		dst++;
		count--;
		if (count < 2) goto bytecopy;
	}

	if ((unsigned long)src & 2) {
		*(u16 *)dst = __raw_readw(src);
		src += 2;
		dst += 2;
		count -= 2;
	}

	while (count > 3) {
		*(u32 *)dst = __raw_readl(src);
		dst += 4;
		src += 4;
		count -= 4;
	}

 shortcopy:
	while (count > 1) {
		*(u16 *)dst = __raw_readw(src);
		src += 2;
		dst += 2;
		count -= 2;
	}

 bytecopy:
	while (count--) {
		*(char *)dst = readb(src);
		src++;
		dst++;
	}
}