static inline int arch_atomic_cmpxchg()

in include/asm/atomic.h [64:81]

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

static inline int arch_atomic_cmpxchg(atomic_t *v, int old, int new)
{
	int __oldval;

	asm volatile(
		"1:	%0 = memw_locked(%1);\n"
		"	{ P0 = cmp.eq(%0,%2);\n"
		"	  if (!P0.new) jump:nt 2f; }\n"
		"	memw_locked(%1,P0) = %3;\n"
		"	if (!P0) jump 1b;\n"
		"2:\n"
		: "=&r" (__oldval)
		: "r" (&v->counter), "r" (old), "r" (new)
		: "memory", "p0"
	);

	return __oldval;
}