static inline int arch_atomic_fetch_add_unless()

in include/asm/atomic.h [160:182]

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

static inline int arch_atomic_fetch_add_unless(atomic_t *v, int a, int u)
{
	int __oldval;
	register int tmp;

	asm volatile(
		"1:	%0 = memw_locked(%2);"
		"	{"
		"		p3 = cmp.eq(%0, %4);"
		"		if (p3.new) jump:nt 2f;"
		"		%1 = add(%0, %3);"
		"	}"
		"	memw_locked(%2, p3) = %1;"
		"	{"
		"		if (!p3) jump 1b;"
		"	}"
		"2:"
		: "=&r" (__oldval), "=&r" (tmp)
		: "r" (v), "r" (a), "r" (u)
		: "memory", "p3"
	);
	return __oldval;
}