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1.1 ohara 1: dnl Intel Pentium mpn_com_n -- mpn ones complement.
2:
3: dnl Copyright 1996, 2001, 2002 Free Software Foundation, Inc.
4: dnl
5: dnl This file is part of the GNU MP Library.
6: dnl
7: dnl The GNU MP Library is free software; you can redistribute it and/or
8: dnl modify it under the terms of the GNU Lesser General Public License as
9: dnl published by the Free Software Foundation; either version 2.1 of the
10: dnl License, or (at your option) any later version.
11: dnl
12: dnl The GNU MP Library is distributed in the hope that it will be useful,
13: dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
14: dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15: dnl Lesser General Public License for more details.
16: dnl
17: dnl You should have received a copy of the GNU Lesser General Public
18: dnl License along with the GNU MP Library; see the file COPYING.LIB. If
19: dnl not, write to the Free Software Foundation, Inc., 59 Temple Place -
20: dnl Suite 330, Boston, MA 02111-1307, USA.
21:
22: include(`../config.m4')
23:
24:
25: C P5: 1.75 cycles/limb
26:
27:
28: NAILS_SUPPORT(0-31)
29:
30:
31: C void mpn_com_n (mp_ptr dst, mp_srcptr src, mp_size_t size);
32: C
33: C This code is similar to mpn_copyi, basically there's just some "xorl
34: C $GMP_NUMB_MASK"s inserted.
35: C
36: C Alternatives:
37: C
38: C On P55 some MMX code could be 1.25 c/l (8 limb unrolled) if src and dst
39: C are the same alignment mod 8, but it doesn't seem worth the trouble for
40: C just that case (there'd need to be some plain integer available too for
41: C the unaligned case).
42:
43: defframe(PARAM_SIZE,12)
44: defframe(PARAM_SRC, 8)
45: defframe(PARAM_DST, 4)
46:
47: PROLOGUE(mpn_com_n)
48: deflit(`FRAME',0)
49:
50: movl PARAM_SRC, %eax
51: movl PARAM_SIZE, %ecx
52:
53: pushl %esi FRAME_pushl()
54: pushl %edi FRAME_pushl()
55:
56: leal (%eax,%ecx,4), %eax
57: xorl $-1, %ecx C -size-1
58:
59: movl PARAM_DST, %edx
60: addl $8, %ecx C -size+7
61:
62: jns L(end)
63:
64: movl (%edx), %esi C fetch destination cache line
65: nop
66:
67: L(top):
68: C eax &src[size]
69: C ebx
70: C ecx counter, limbs, negative
71: C edx dst, incrementing
72: C esi scratch
73: C edi scratch
74: C ebp
75:
76: movl 28(%edx), %esi C destination prefetch
77: addl $32, %edx
78:
79: movl -28(%eax,%ecx,4), %esi
80: movl -24(%eax,%ecx,4), %edi
81: xorl $GMP_NUMB_MASK, %esi
82: xorl $GMP_NUMB_MASK, %edi
83: movl %esi, -32(%edx)
84: movl %edi, -28(%edx)
85:
86: movl -20(%eax,%ecx,4), %esi
87: movl -16(%eax,%ecx,4), %edi
88: xorl $GMP_NUMB_MASK, %esi
89: xorl $GMP_NUMB_MASK, %edi
90: movl %esi, -24(%edx)
91: movl %edi, -20(%edx)
92:
93: movl -12(%eax,%ecx,4), %esi
94: movl -8(%eax,%ecx,4), %edi
95: xorl $GMP_NUMB_MASK, %esi
96: xorl $GMP_NUMB_MASK, %edi
97: movl %esi, -16(%edx)
98: movl %edi, -12(%edx)
99:
100: movl -4(%eax,%ecx,4), %esi
101: movl (%eax,%ecx,4), %edi
102: xorl $GMP_NUMB_MASK, %esi
103: xorl $GMP_NUMB_MASK, %edi
104: movl %esi, -8(%edx)
105: movl %edi, -4(%edx)
106:
107: addl $8, %ecx
108: js L(top)
109:
110:
111: L(end):
112: C eax &src[size]
113: C ecx 0 to 7, representing respectively 7 to 0 limbs remaining
114: C edx dst, next location to store
115:
116: subl $4, %ecx
117: nop
118:
119: jns L(no4)
120:
121: movl -12(%eax,%ecx,4), %esi
122: movl -8(%eax,%ecx,4), %edi
123: xorl $GMP_NUMB_MASK, %esi
124: xorl $GMP_NUMB_MASK, %edi
125: movl %esi, (%edx)
126: movl %edi, 4(%edx)
127:
128: movl -4(%eax,%ecx,4), %esi
129: movl (%eax,%ecx,4), %edi
130: xorl $GMP_NUMB_MASK, %esi
131: xorl $GMP_NUMB_MASK, %edi
132: movl %esi, 8(%edx)
133: movl %edi, 12(%edx)
134:
135: addl $16, %edx
136: addl $4, %ecx
137: L(no4):
138:
139: subl $2, %ecx
140: nop
141:
142: jns L(no2)
143:
144: movl -4(%eax,%ecx,4), %esi
145: movl (%eax,%ecx,4), %edi
146: xorl $GMP_NUMB_MASK, %esi
147: xorl $GMP_NUMB_MASK, %edi
148: movl %esi, (%edx)
149: movl %edi, 4(%edx)
150:
151: addl $8, %edx
152: addl $2, %ecx
153: L(no2):
154:
155: popl %edi
156: jnz L(done)
157:
158: movl -4(%eax), %ecx
159:
160: xorl $GMP_NUMB_MASK, %ecx
161: popl %esi
162:
163: movl %ecx, (%edx)
164: ret
165:
166: L(done):
167: popl %esi
168: ret
169:
170: EPILOGUE()