126 lines
2.7 KiB
NASM
126 lines
2.7 KiB
NASM
dnl mpn_addsub
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dnl Copyright 2011 The Code Cavern
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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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ASM_START()
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PROLOGUE(mpn_addsub_n)
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push %rbx
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xor %r9,%r9
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push %rbp
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xor %rax,%rax
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mov $3,%r10d
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sub %r8,%r10
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lea -24(%rdi,%r8,8),%rdi
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lea -24(%rsi,%r8,8),%rsi
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lea -24(%rdx,%r8,8),%rdx
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lea -24(%rcx,%r8,8),%rcx
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jnc skiplp
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.align 16
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lp: .byte 0x9e # sahf
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mov (%rdx,%r10,8),%r8
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sbb (%rcx,%r10,8),%r8
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mov 8(%rdx,%r10,8),%rbx
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sbb 8(%rcx,%r10,8),%rbx
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mov 24(%rdx,%r10,8),%r11
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mov 16(%rdx,%r10,8),%rbp
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sbb 16(%rcx,%r10,8),%rbp
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sbb 24(%rcx,%r10,8),%r11
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.byte 0x9f # lahf
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add $255,%r9b
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adc (%rsi,%r10,8),%r8
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adc 8(%rsi,%r10,8),%rbx
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mov %r8,(%rdi,%r10,8)
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adc 16(%rsi,%r10,8),%rbp
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adc 24(%rsi,%r10,8),%r11
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setc %r9b
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mov %r11,24(%rdi,%r10,8)
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mov %rbp,16(%rdi,%r10,8)
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mov %rbx,8(%rdi,%r10,8)
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add $4,%r10
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jnc lp
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skiplp:
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cmp $2,%r10
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jg case0
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je case1
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jp case2
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case3: .byte 0x9e # sahf
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mov (%rdx),%r8
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sbb (%rcx),%r8
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mov 8(%rdx),%rbx
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sbb 8(%rcx),%rbx
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mov 16(%rdx),%rbp
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sbb 16(%rcx),%rbp
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.byte 0x9f # lahf
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add $255,%r9b
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adc (%rsi),%r8
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adc 8(%rsi),%rbx
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mov %r8,(%rdi)
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adc 16(%rsi),%rbp
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setc %r9b
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mov %rbp,16(%rdi)
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mov %rbx,8(%rdi)
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.byte 0x9e # sahf
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mov $0,%eax
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sbb $0,%rax
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add $255,%r9b
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adc $0,%rax
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pop %rbp
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pop %rbx
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ret
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case2: .byte 0x9e # sahf
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mov 8(%rdx),%r8
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sbb 8(%rcx),%r8
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mov 16(%rdx),%rbx
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sbb 16(%rcx),%rbx
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.byte 0x9f # lahf
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add $255,%r9b
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adc 8(%rsi),%r8
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adc 16(%rsi),%rbx
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mov %r8,8(%rdi)
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setc %r9b
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mov %rbx,16(%rdi)
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.byte 0x9e # sahf
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mov $0,%eax
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sbb $0,%rax
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add $255,%r9b
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adc $0,%rax
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pop %rbp
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pop %rbx
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ret
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case1: .byte 0x9e # sahf
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mov 16(%rdx),%r8
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sbb 16(%rcx),%r8
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.byte 0x9f # lahf
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add $255,%r9b
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adc 16(%rsi),%r8
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mov %r8,16(%rdi)
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setc %r9b
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case0: .byte 0x9e # sahf
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mov $0,%eax
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sbb $0,%rax
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add $255,%r9b
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adc $0,%rax
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pop %rbp
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pop %rbx
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ret
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EPILOGUE()
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