Return to bcopy.s CVS log

Up to [Power 6/32 Unix Tahoe 4.2BSD] / cci / sys / tahoe

Power 6/32 Unix version 1.2b

/* @(#)bcopy.s	4.4 3/23/84 */
/* bcopy(from, to, size) */

	.globl	_bcopy
_bcopy:
	.word	0x001c
	movl	4(fp),r0
	movl	8(fp),r1
	movl	12(fp),r2
	cmpl	r0,r1
	bgtru	1f		# normal forward case
	beql	2f		# equal, nothing to do
	addl2	r2,r0		# may be overlapping
	cmpl	r0,r1
	bgtru	3f
	subl2	r2,r0		# normal forward case
1:
	movblk
2:
	ret
3:
	addl2	r2,r1		# overlapping, must do backwards
	subl3	r0,r1,r3
	movl	r2,r4
	jbr	5f
4:
	subl2	r3,r0
	subl2	r3,r1
	movl	r3,r2
	movblk
	subl2	r3,r0
	subl2	r3,r1
	subl2	r3,r4
5:
	cmpl	r4,r3
	jgtr	4b
	movl	r4,r2
	subl2	r2,r0
	subl2	r2,r1
	movblk
	ret

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.