Mon Mar 9 08:29:12 2020 UTC ()
Remove wrong comment (copy-paste from somewhere);
__mulsi3 does not depend on __udivsi3.


(rin)
diff -r1.4 -r1.5 src/common/lib/libc/arch/m68k/gen/mulsi3.S
cvs diff -r1.4 -r1.5 src/common/lib/libc/arch/m68k/gen/mulsi3.S (expand / switch to unified diff)

--- src/common/lib/libc/arch/m68k/gen/mulsi3.S 2013/07/16 23:24:18 1.4
+++ src/common/lib/libc/arch/m68k/gen/mulsi3.S 2020/03/09 08:29:11 1.5
@@ -1,14 +1,14 @@ @@ -1,14 +1,14 @@
1/* $NetBSD: mulsi3.S,v 1.4 2013/07/16 23:24:18 matt Exp $ */ 1/* $NetBSD: mulsi3.S,v 1.5 2020/03/09 08:29:11 rin Exp $ */
2 2
3/*- 3/*-
4 * Copyright (c) 1990 The Regents of the University of California. 4 * Copyright (c) 1990 The Regents of the University of California.
5 * All rights reserved. 5 * All rights reserved.
6 * 6 *
7 * This code is derived from software contributed to Berkeley by 7 * This code is derived from software contributed to Berkeley by
8 * the Systems Programming Group of the University of Utah Computer 8 * the Systems Programming Group of the University of Utah Computer
9 * Science Department. 9 * Science Department.
10 * 10 *
11 * Redistribution and use in source and binary forms, with or without 11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions 12 * modification, are permitted provided that the following conditions
13 * are met: 13 * are met:
14 * 1. Redistributions of source code must retain the above copyright 14 * 1. Redistributions of source code must retain the above copyright
@@ -29,38 +29,36 @@ @@ -29,38 +29,36 @@
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE. 33 * SUCH DAMAGE.
34 */ 34 */
35 35
36#include <machine/asm.h> 36#include <machine/asm.h>
37 37
38#if defined(LIBC_SCCS) && !defined(lint) 38#if defined(LIBC_SCCS) && !defined(lint)
39#if 0 39#if 0
40 RCSID("from: @(#)mulsi3.s 5.1 (Berkeley) 6/7/90") 40 RCSID("from: @(#)mulsi3.s 5.1 (Berkeley) 6/7/90")
41#else 41#else
42 RCSID("$NetBSD: mulsi3.S,v 1.4 2013/07/16 23:24:18 matt Exp $") 42 RCSID("$NetBSD: mulsi3.S,v 1.5 2020/03/09 08:29:11 rin Exp $")
43#endif 43#endif
44#endif /* LIBC_SCCS and not lint */ 44#endif /* LIBC_SCCS and not lint */
45 45
46/* int * int */ 46/* int * int */
47ENTRY(__mulsi3) 47ENTRY(__mulsi3)
48#ifndef __mc68010__ 48#ifndef __mc68010__
49 movel 4(%sp),%d0 49 movel 4(%sp),%d0
50 mulsl 8(%sp),%d0 50 mulsl 8(%sp),%d0
51#else 51#else
52| NB: this requires that __udivsi3 preserve %a0 and return 
53| the modulus in %d1: 
54 movew 6(%sp), %d0 52 movew 6(%sp), %d0
55 movel %d0, %a0 | save B 53 movel %d0, %a0 | save B
56 muluw 8(%sp), %d0 | %d0 holds B * C 54 muluw 8(%sp), %d0 | %d0 holds B * C
57 movew 10(%sp), %d1 55 movew 10(%sp), %d1
58 movel %d1, %a1 | save D 56 movel %d1, %a1 | save D
59 muluw 4(%sp), %d1 | %d1 holds A * D 57 muluw 4(%sp), %d1 | %d1 holds A * D
60 addw %d1, %d0 | %d0 holds (B * C) + (A * D) 58 addw %d1, %d0 | %d0 holds (B * C) + (A * D)
61 swap %d0 59 swap %d0
62 clrw %d0 | %d0 holds ((B * C) + (A * D)) << 16 60 clrw %d0 | %d0 holds ((B * C) + (A * D)) << 16
63 exg %a0, %d0 | restore B 61 exg %a0, %d0 | restore B
64 movel %a1, %d1 | restore D 62 movel %a1, %d1 | restore D
65 muluw %d1, %d0 | %d0 holds B * D 63 muluw %d1, %d0 | %d0 holds B * D
66 addl %a0, %d0 | final result 64 addl %a0, %d0 | final result