static inline int test_and_set_bit()

in include/asm/bitops.h [55:74]

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

static inline int test_and_set_bit(int nr, volatile void *addr)
{
	int oldval;

	__asm__ __volatile__ (
	"	{R10 = %1; R11 = asr(%2,#5); }\n"
	"	{R10 += asl(R11,#2); R11 = and(%2,#0x1f)}\n"
	"1:	R12 = memw_locked(R10);\n"
	"	{ P0 = tstbit(R12,R11); R12 = setbit(R12,R11); }\n"
	"	memw_locked(R10,P1) = R12;\n"
	"	{if (!P1) jump 1b; %0 = mux(P0,#1,#0);}\n"
	: "=&r" (oldval)
	: "r" (addr), "r" (nr)
	: "r10", "r11", "r12", "p0", "p1", "memory"
	);


	return oldval;

}