1 dnl Alpha __gmpn_addmul_1 -- Multiply a limb vector with a limb and add
2 dnl the result to a second limb vector.
4 dnl Copyright (C) 1992, 1994, 1995, 2000 Free Software Foundation, Inc.
6 dnl This file is part of the GNU MP Library.
8 dnl The GNU MP Library is free software; you can redistribute it and/or modify
9 dnl it under the terms of the GNU Lesser General Public License as published
10 dnl by the Free Software Foundation; either version 2.1 of the License, or (at
11 dnl your option) any later version.
13 dnl The GNU MP Library is distributed in the hope that it will be useful, but
14 dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
16 dnl License for more details.
18 dnl You should have received a copy of the GNU Lesser General Public License
19 dnl along with the GNU MP Library; see the file COPYING.LIB. If not, write to
20 dnl the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
21 dnl MA 02111-1307, USA.
23 include(`../config.m4')
31 dnl This code runs at 42 cycles/limb on EV4, 18 cycles/limb on EV5, and 7
32 dnl cycles/limb on EV6.
35 PROLOGUE(mpn_addmul_1)
36 ldq r2,0(r17) C r2 = s1_limb
37 addq r17,8,r17 C s1_ptr++
38 subq r18,1,r18 C size--
39 mulq r2,r19,r3 C r3 = prod_low
40 ldq r5,0(r16) C r5 = *res_ptr
41 umulh r2,r19,r0 C r0 = prod_high
42 beq r18,$Lend1 C jump if size was == 1
43 ldq r2,0(r17) C r2 = s1_limb
44 addq r17,8,r17 C s1_ptr++
45 subq r18,1,r18 C size--
49 addq r16,8,r16 C res_ptr++
50 beq r18,$Lend2 C jump if size was == 2
53 $Loop: mulq r2,r19,r3 C r3 = prod_low
54 ldq r5,0(r16) C r5 = *res_ptr
55 addq r4,r0,r0 C cy_limb = cy_limb + 'cy'
56 subq r18,1,r18 C size--
57 umulh r2,r19,r4 C r4 = cy_limb
58 ldq r2,0(r17) C r2 = s1_limb
59 addq r17,8,r17 C s1_ptr++
60 addq r3,r0,r3 C r3 = cy_limb + prod_low
61 cmpult r3,r0,r0 C r0 = carry from (cy_limb + prod_low)
65 addq r16,8,r16 C res_ptr++
66 addq r5,r0,r0 C combine carries
69 $Lend2: mulq r2,r19,r3 C r3 = prod_low
70 ldq r5,0(r16) C r5 = *res_ptr
71 addq r4,r0,r0 C cy_limb = cy_limb + 'cy'
72 umulh r2,r19,r4 C r4 = cy_limb
73 addq r3,r0,r3 C r3 = cy_limb + prod_low
74 cmpult r3,r0,r0 C r0 = carry from (cy_limb + prod_low)
78 addq r5,r0,r0 C combine carries
79 addq r4,r0,r0 C cy_limb = prod_high + cy
86 EPILOGUE(mpn_addmul_1)