2010-09-03 14:36:25 +08:00
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/* x86-64 __mpn_add_n -- Add two limb vectors of the same length > 0 and store
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sum in a third limb vector.
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Copyright (C) 2006, 2007 Free Software Foundation, Inc.
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2009-04-15 06:24:59 +08:00
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA. */
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#include "sysdep.h"
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#include "asm-syntax.h"
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2010-09-03 14:36:25 +08:00
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#define rp %rdi
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#define up %rsi
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#define vp %rdx
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#define n %rcx
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#define cy %r8
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#ifndef func
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# define func __mpn_add_n
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# define ADCSBB adc
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#endif
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2009-04-15 06:24:59 +08:00
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.text
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2010-09-03 14:36:25 +08:00
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ENTRY (func)
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xor %r8, %r8
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mov (up), %r10
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mov (vp), %r11
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lea -8(up,n,8), up
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lea -8(vp,n,8), vp
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lea -16(rp,n,8), rp
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mov %ecx, %eax
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neg n
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and $3, %eax
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je L(b00)
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add %rax, n /* clear low rcx bits for jrcxz */
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cmp $2, %eax
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jl L(b01)
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je L(b10)
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L(b11): shr %r8 /* set cy */
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jmp L(e11)
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L(b00): shr %r8 /* set cy */
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mov %r10, %r8
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mov %r11, %r9
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lea 4(n), n
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jmp L(e00)
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L(b01): shr %r8 /* set cy */
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jmp L(e01)
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L(b10): shr %r8 /* set cy */
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mov %r10, %r8
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mov %r11, %r9
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jmp L(e10)
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L(end): ADCSBB %r11, %r10
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mov %r10, 8(rp)
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mov %ecx, %eax /* clear eax, ecx contains 0 */
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adc %eax, %eax
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2009-04-15 06:24:59 +08:00
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ret
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2010-09-03 14:36:25 +08:00
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.p2align 4
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L(top):
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mov -24(up,n,8), %r8
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mov -24(vp,n,8), %r9
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ADCSBB %r11, %r10
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mov %r10, -24(rp,n,8)
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L(e00):
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mov -16(up,n,8), %r10
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mov -16(vp,n,8), %r11
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ADCSBB %r9, %r8
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mov %r8, -16(rp,n,8)
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L(e11):
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mov -8(up,n,8), %r8
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mov -8(vp,n,8), %r9
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ADCSBB %r11, %r10
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mov %r10, -8(rp,n,8)
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L(e10):
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mov (up,n,8), %r10
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mov (vp,n,8), %r11
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ADCSBB %r9, %r8
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mov %r8, (rp,n,8)
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L(e01):
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jrcxz L(end)
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lea 4(n), n
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jmp L(top)
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END (func)
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