static inline int test_and_change_bit()

in include/asm/bitops/atomic.h [103:121]

• 17 lines of code
• 1 McCabe index (conditional complexity)

static inline int test_and_change_bit(int nr, volatile unsigned long *addr)
{
	unsigned long mask = BIT_MASK(nr);
	unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
	unsigned long old;
	unsigned long tmp;

	__asm__ __volatile__(
		"1:	l.lwa	%0,0(%2)	\n"
		"	l.xor	%1,%0,%3	\n"
		"	l.swa	0(%2),%1	\n"
		"	l.bnf	1b		\n"
		"	 l.nop			\n"
		: "=&r"(old), "=&r"(tmp)
		: "r"(p), "r"(mask)
		: "cc", "memory");

	return (old & mask) != 0;
}