static void _wordcopy_fwd_dest_aligned()

in lib/memcpy.c [112:158]

• 35 lines of code
• 3 McCabe index (conditional complexity)

static void _wordcopy_fwd_dest_aligned(long int dstp, long int srcp,
					size_t len)
{
	op_t ap;
	int sh_1, sh_2;

	/* Calculate how to shift a word read at the memory operation
	aligned srcp to make it aligned for copy. */

	sh_1 = 8 * (srcp % OPSIZ);
	sh_2 = 8 * OPSIZ - sh_1;

	/* Make SRCP aligned by rounding it down to the beginning of the `op_t'
	it points in the middle of. */
	srcp &= -OPSIZ;
	ap = ((op_t *) srcp)[0];
	srcp += OPSIZ;

	while (len > 3) {
		op_t a0, a1, a2, a3;

		a0 = ((op_t *) srcp)[0];
		a1 = ((op_t *) srcp)[1];
		a2 = ((op_t *) srcp)[2];
		a3 = ((op_t *) srcp)[3];
		((op_t *) dstp)[0] = MERGE(ap, sh_1, a0, sh_2);
		((op_t *) dstp)[1] = MERGE(a0, sh_1, a1, sh_2);
		((op_t *) dstp)[2] = MERGE(a1, sh_1, a2, sh_2);
		((op_t *) dstp)[3] = MERGE(a2, sh_1, a3, sh_2);

		ap = a3;
		srcp += 4 * OPSIZ;
		dstp += 4 * OPSIZ;
		len -= 4;
	}
	while (len > 0) {
		register op_t a0;

		a0 = ((op_t *) srcp)[0];
		((op_t *) dstp)[0] = MERGE(ap, sh_1, a0, sh_2);

		ap = a0;
		srcp += OPSIZ;
		dstp += OPSIZ;
		len -= 1;
	}
}