static inline int arch_read_trylock()

in include/asm/spinlock.h [58:73]

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

static inline int arch_read_trylock(arch_rwlock_t *lock)
{
	int temp;
	__asm__ __volatile__(
		"	R6 = memw_locked(%1);\n"
		"	{ %0 = #0; P3 = cmp.ge(R6,#0); R6 = add(R6,#1);}\n"
		"	{ if (!P3) jump 1f; }\n"
		"	memw_locked(%1,P3) = R6;\n"
		"	{ %0 = P3 }\n"
		"1:\n"
		: "=&r" (temp)
		: "r" (&lock->lock)
		: "memory", "r6", "p3"
	);
	return temp;
}