#include <string.h>
#include <stdint.h>

#define aliases __attribute__((__may_alias__))
#define byte_repeat(x) ((size_t)~0 / 0xff * (x))
#define word_has_zero(x) (((x) - byte_repeat(0x01)) & ~(x) & byte_repeat(0x80))

int strcmp(const char *_l, const char *_r)
{
	const unsigned char *l = (const void *)_l, *r = (const void *)_r;
	const size_t aliases *wl, aliases *wr;

	if (((uintptr_t)l | (uintptr_t)r) & sizeof(size_t) - 1) goto bytewise;

	for (; (uintptr_t)l & sizeof(size_t) - 1 && *l && *l == *r; l++, r++);
	if ((uintptr_t)l & sizeof(size_t) - 1) return *l - *r;

	wl = (const void *)l;
	wr = (const void *)r;
	for (; !word_has_zero(*wl) && *wl == *wr; wl++, wr++);
	l = (const void *)wl;
	r = (const void *)wr;

bytewise:
	for (; *l && *l == *r; l++, r++);

	return *l - *r;
}