static inline int test_bit()

in include/asm/bitops.h [67:88]

• 21 lines of code
• 2 McCabe index (conditional complexity)

static inline int test_bit(int nr, const volatile unsigned long *addr)
{
	int ret = 0;
	unsigned char *b_addr;
	unsigned char bit = nr & 7;

	b_addr = (unsigned char *)addr + ((nr >> 3) ^ 3);
	if (__builtin_constant_p(nr)) {
		__asm__("bld %Z2,%1\n\t"
			"rotxl %0\n\t"
			: "=r"(ret)
			: "WU"(*b_addr), "i"(nr & 7), "0"(ret) : "cc");
	} else {
		__asm__("btst %w2,%1\n\t"
			"beq 1f\n\t"
			"inc.l #1,%0\n"
			"1:"
			: "=r"(ret)
			: "WU"(*b_addr), "r"(bit), "0"(ret) : "cc");
	}
	return ret;
}