91 lines
1.9 KiB
NASM
91 lines
1.9 KiB
NASM
dnl AMD64 mpn_addsub_n
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dnl Copyright 2009 Jason Moxham
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dnl This file is part of the MPIR Library.
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dnl The MPIR Library is free software; you can redistribute it and/or modify
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dnl it under the terms of the GNU Lesser General Public License as published
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dnl by the Free Software Foundation; either version 2.1 of the License, or (at
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dnl your option) any later version.
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dnl The MPIR Library is distributed in the hope that it will be useful, but
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dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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dnl License for more details.
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dnl You should have received a copy of the GNU Lesser General Public License
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dnl along with the MPIR Library; see the file COPYING.LIB. If not, write
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dnl to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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dnl Boston, MA 02110-1301, USA.
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include(`../config.m4')
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C INPUT PARAMETERS
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C rp rdi
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C xp rsi
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C yp rdx
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C zp rcx
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C n r8
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C (rdi,r8)=(rsi,r8)+(rdx,r8)-(rcx,r8)
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C return carry-borrow
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ASM_START()
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PROLOGUE(mpn_addsub_n)
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lea (%rsi,%r8,8),%rsi
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lea (%rdx,%r8,8),%rdx
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lea (%rdi,%r8,8),%rdi
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lea (%rcx,%r8,8),%rcx
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neg %r8
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xor %rax,%rax
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xor %r10,%r10
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test $3,%r8
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jz next
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lp1:
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mov (%rdx,%r8,8),%r9
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add $1,%rax
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sbb (%rcx,%r8,8),%r9
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sbb %rax,%rax
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add $1,%r10
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adc (%rsi,%r8,8),%r9
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sbb %r10,%r10
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mov %r9,(%rdi,%r8,8)
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inc %r8
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test $3,%r8
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jnz lp1
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next:
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cmp $0,%r8
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jz end
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push %rbx
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push %rbp
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ALIGN(16)
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lp:
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add $1,%rax
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mov (%rdx,%r8,8),%r9
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mov 8(%rdx,%r8,8),%rbx
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mov 16(%rdx,%r8,8),%rbp
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mov 24(%rdx,%r8,8),%r11
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sbb (%rcx,%r8,8),%r9
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sbb 8(%rcx,%r8,8),%rbx
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sbb 16(%rcx,%r8,8),%rbp
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sbb 24(%rcx,%r8,8),%r11
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sbb %rax,%rax
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add $1,%r10
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adc (%rsi,%r8,8),%r9
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adc 8(%rsi,%r8,8),%rbx
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adc 16(%rsi,%r8,8),%rbp
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adc 24(%rsi,%r8,8),%r11
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mov %r9,(%rdi,%r8,8)
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mov %rbx,8(%rdi,%r8,8)
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mov %rbp,16(%rdi,%r8,8)
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mov %r11,24(%rdi,%r8,8)
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sbb %r10,%r10
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add $4,%r8
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jnz lp
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pop %rbp
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pop %rbx
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end:
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sub %r10,%rax
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ret
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EPILOGUE()
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