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1.1 ohara 1: dnl HP-PA 2.0 mpn_lshift -- Left shift.
2:
3: dnl Copyright 1997, 2000, 2002 Free Software Foundation, Inc.
4:
5: dnl This file is part of the GNU MP Library.
6:
7: dnl The GNU MP Library is free software; you can redistribute it and/or modify
8: dnl it under the terms of the GNU Lesser General Public License as published by
9: dnl the Free Software Foundation; either version 2.1 of the License, or (at your
10: dnl option) any later version.
11:
12: dnl The GNU MP Library is distributed in the hope that it will be useful, but
13: dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14: dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
15: dnl License for more details.
16:
17: dnl You should have received a copy of the GNU Lesser General Public License
18: dnl along with the GNU MP Library; see the file COPYING.LIB. If not, write to
19: dnl the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
20: dnl MA 02111-1307, USA.
21:
22:
23: dnl This runs at 1.5 cycles/limb on PA8000 and 1.0 cycles/limb on PA8500.
24:
25: include(`../config.m4')
26:
27: dnl INPUT PARAMETERS
28: define(`rp',`%r26')
29: define(`up',`%r25')
30: define(`n',`%r24')
31: define(`cnt',`%r23')
32:
33: ifdef(`HAVE_ABI_2_0w',
34: ` .level 2.0W
35: ',` .level 2.0N
36: ')
37: PROLOGUE(mpn_lshift)
38: shladd n, 3, up, up
39: shladd n, 3, rp, rp
40: subi 64, cnt, cnt
41: mtsar cnt
42: ldd -8(up), %r21
43: addib,= -1, n, L(end)
44: shrpd %r0, %r21, %sar, %r29 C compute carry out limb
45: depw,z n, 31, 3, %r28 C r28 = (size & 7)
46: sub %r0, n, %r22
47: depw,z %r22, 28, 3, %r22 C r22 = 8 * (-size & 7)
48: add up, %r22, up C offset up
49: blr %r28, %r0 C branch into jump table
50: add rp, %r22, rp C offset rp
51: b L(0)
52: nop
53: b L(1)
54: copy %r21, %r20
55: b L(2)
56: nop
57: b L(3)
58: copy %r21, %r20
59: b L(4)
60: nop
61: b L(5)
62: copy %r21, %r20
63: b L(6)
64: nop
65: b L(7)
66: copy %r21, %r20
67:
68: L(loop)
69: L(0) ldd -16(up), %r20
70: shrpd %r21, %r20, %sar, %r21
71: std %r21, -8(rp)
72: L(7) ldd -24(up), %r21
73: shrpd %r20, %r21, %sar, %r20
74: std %r20, -16(rp)
75: L(6) ldd -32(up), %r20
76: shrpd %r21, %r20, %sar, %r21
77: std %r21, -24(rp)
78: L(5) ldd -40(up), %r21
79: shrpd %r20, %r21, %sar, %r20
80: std %r20, -32(rp)
81: L(4) ldd -48(up), %r20
82: shrpd %r21, %r20, %sar, %r21
83: std %r21, -40(rp)
84: L(3) ldd -56(up), %r21
85: shrpd %r20, %r21, %sar, %r20
86: std %r20, -48(rp)
87: L(2) ldd -64(up), %r20
88: shrpd %r21, %r20, %sar, %r21
89: std %r21, -56(rp)
90: L(1) ldd -72(up), %r21
91: ldo -64(up), up
92: shrpd %r20, %r21, %sar, %r20
93: std %r20, -64(rp)
94: addib,> -8, n, L(loop)
95: ldo -64(rp), rp
96:
97: L(end) shrpd %r21, %r0, %sar, %r21
98: std %r21, -8(rp)
99: bve (%r2)
100: ifdef(`HAVE_ABI_2_0w',
101: ` copy %r29,%r28
102: ',` extrd,u %r29, 31, 32, %r28
103: ')
104: EPILOGUE(mpn_lshift)