Annotation of OpenXM_contrib/gmp/mpn/x86/pentium4/sse2/add_n.asm, Revision 1.1.1.1
1.1 ohara 1: dnl Intel Pentium-4 mpn_add_n -- mpn addition.
2:
3: dnl Copyright 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 P4: 4.0 cycles/limb if dst!=src1 and dst!=src2
26: C 6.0 cycles/limb if dst==src1 or dst==src2
27:
28:
29: C mp_limb_t mpn_add_n (mp_ptr dst, mp_srcptr src1, mp_srcptr src2,
30: C mp_size_t size);
31: C mp_limb_t mpn_add_nc (mp_ptr dst, mp_srcptr src1, mp_srcptr src2,
32: C mp_size_t size, mp_limb_t carry);
33: C
34: C The 4 c/l achieved here isn't particularly good, but is better than 9 c/l
35: C for a basic adc loop.
36:
37: defframe(PARAM_CARRY,20)
38: defframe(PARAM_SIZE, 16)
39: defframe(PARAM_SRC2, 12)
40: defframe(PARAM_SRC1, 8)
41: defframe(PARAM_DST, 4)
42:
43: dnl re-use parameter space
44: define(SAVE_EBX,`PARAM_SRC1')
45:
46: TEXT
47: ALIGN(8)
48:
49: PROLOGUE(mpn_add_nc)
50: deflit(`FRAME',0)
51:
52: movd PARAM_CARRY, %mm0
53: jmp L(start_nc)
54:
55: EPILOGUE()
56:
57: ALIGN(8)
58: PROLOGUE(mpn_add_n)
59: deflit(`FRAME',0)
60:
61: pxor %mm0, %mm0
62:
63: L(start_nc):
64: movl PARAM_SRC1, %eax
65: movl %ebx, SAVE_EBX
66: movl PARAM_SRC2, %ebx
67: movl PARAM_DST, %edx
68: movl PARAM_SIZE, %ecx
69:
70: leal (%eax,%ecx,4), %eax C src1 end
71: leal (%ebx,%ecx,4), %ebx C src2 end
72: leal (%edx,%ecx,4), %edx C dst end
73: negl %ecx C -size
74:
75: L(top):
76: C eax src1 end
77: C ebx src2 end
78: C ecx counter, limbs, negative
79: C edx dst end
80: C mm0 carry bit
81:
82: movd (%eax,%ecx,4), %mm1
83: movd (%ebx,%ecx,4), %mm2
84: paddq %mm2, %mm1
85:
86: paddq %mm1, %mm0
87: movd %mm0, (%edx,%ecx,4)
88:
89: psrlq $32, %mm0
90:
91: addl $1, %ecx
92: jnz L(top)
93:
94:
95: movd %mm0, %eax
96: movl SAVE_EBX, %ebx
97: emms
98: ret
99:
100: EPILOGUE()
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>