1dnl  S/390 mpn_mul_1 -- Multiply a limb vector with a limb and store the
2dnl  result in a second limb vector.
3
4dnl  Copyright 2001 Free Software Foundation, Inc.
5
6dnl  This file is part of the GNU MP Library.
7dnl
8dnl  The GNU MP Library is free software; you can redistribute it and/or modify
9dnl  it under the terms of either:
10dnl
11dnl    * the GNU Lesser General Public License as published by the Free
12dnl      Software Foundation; either version 3 of the License, or (at your
13dnl      option) any later version.
14dnl
15dnl  or
16dnl
17dnl    * the GNU General Public License as published by the Free Software
18dnl      Foundation; either version 2 of the License, or (at your option) any
19dnl      later version.
20dnl
21dnl  or both in parallel, as here.
22dnl
23dnl  The GNU MP Library is distributed in the hope that it will be useful, but
24dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
25dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
26dnl  for more details.
27dnl
28dnl  You should have received copies of the GNU General Public License and the
29dnl  GNU Lesser General Public License along with the GNU MP Library.  If not,
30dnl  see https://www.gnu.org/licenses/.
31
32include(`../config.m4')
33
34define(`rp',2)
35define(`up',3)
36define(`n',4)
37define(`vlimb',5)
38define(`cylimb',7)
39
40ASM_START()
41PROLOGUE(mpn_mul_1)
42          stm       6,7,24(15)
43          slr       cylimb,cylimb       # clear cylimb
44          ltr       vlimb,vlimb
45          jnl       .Loopp
46
47.Loopn:   l         1,0(up)             # load from u
48          lr        6,1                 #
49          mr        0,vlimb             # multiply signed
50          alr       0,6                 # add vlimb to phi
51          sra       6,31                # make mask
52          nr        6,vlimb             # 0 or vlimb
53          alr       0,6                 # conditionally add vlimb to phi
54          alr       1,cylimb  # add carry limb to plo
55          brc       8+4,+8              # branch if not carry
56          ahi       0,1                 # increment phi
57          lr        cylimb,0  # new cylimb
58          st        1,0(rp)             # store
59          la        up,4(,up)
60          la        rp,4(,rp)
61          brct      n,.Loopn
62
63          lr        2,cylimb
64          lm        6,7,24(15)
65          br        14
66
67.Loopp:   l         1,0(up)             # load from u
68          lr        6,1                 #
69          mr        0,vlimb             # multiply signed
70          sra       6,31                # make mask
71          nr        6,vlimb             # 0 or vlimb
72          alr       0,6                 # conditionally add vlimb to phi
73          alr       1,cylimb  # add carry limb to plo
74          brc       8+4,+8              # branch if not carry
75          ahi       0,1                 # increment phi
76          lr        cylimb,0  # new cylimb
77          st        1,0(rp)             # store
78          la        up,4(,up)
79          la        rp,4(,rp)
80          brct      n,.Loopp
81
82          lr        2,cylimb
83          lm        6,7,24(15)
84          br        14
85EPILOGUE(mpn_mul_1)
86