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dnl AMD64 mpn_mod_34lsub1 -- remainder modulo 2^48-1.
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dnl Copyright 2000-2002, 2004, 2005, 2007, 2010-2012 Free Software Foundation,
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dnl Inc.
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dnl This file is part of the GNU MP Library.
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dnl
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dnl The GNU MP Library is free software; you can redistribute it and/or modify
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dnl it under the terms of either:
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dnl
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dnl * the GNU Lesser General Public License as published by the Free
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dnl Software Foundation; either version 3 of the License, or (at your
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dnl option) any later version.
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dnl
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dnl or
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dnl
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dnl * the GNU General Public License as published by the Free Software
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dnl Foundation; either version 2 of the License, or (at your option) any
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dnl later version.
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dnl
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dnl or both in parallel, as here.
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dnl
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dnl The GNU MP 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 General Public License
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dnl for more details.
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dnl
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dnl You should have received copies of the GNU General Public License and the
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dnl GNU Lesser General Public License along with the GNU MP Library. If not,
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dnl see https://www.gnu.org/licenses/.
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include(`../config.m4')
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C cycles/limb
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C AMD K8,K9 1.0
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C AMD K10 1.12
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C Intel P4 3.25
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C Intel core2 1.5
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C Intel corei 1.5
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C Intel atom 2.5
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C VIA nano 1.75
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C INPUT PARAMETERS
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define(`ap', %rdi)
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define(`n', %rsi)
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C mp_limb_t mpn_mod_34lsub1 (mp_srcptr up, mp_size_t n)
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C TODO
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C * Review feed-in and wind-down code. In particular, try to avoid adc and
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C sbb to placate Pentium4.
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C * It seems possible to reach 2.67 c/l by using a cleaner 6-way unrolling,
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C without the dual loop exits.
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ABI_SUPPORT(DOS64)
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ABI_SUPPORT(STD64)
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ASM_START()
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TEXT
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ALIGN(32)
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PROLOGUE(mpn_mod_34lsub1)
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FUNC_ENTRY(2)
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mov $0x0000FFFFFFFFFFFF, %r11
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sub $2, %rsi
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ja L(gt2)
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mov (ap), %rax
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nop
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jb L(1)
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mov 8(ap), %rsi
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mov %rax, %rdx
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shr $48, %rax C src[0] low
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and %r11, %rdx C src[0] high
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add %rdx, %rax
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mov R32(%rsi), R32(%rdx)
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shr $32, %rsi C src[1] high
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add %rsi, %rax
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shl $16, %rdx C src[1] low
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add %rdx, %rax
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L(1): FUNC_EXIT()
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ret
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ALIGN(16)
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L(gt2): xor R32(%rax), R32(%rax)
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xor R32(%rcx), R32(%rcx)
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xor R32(%rdx), R32(%rdx)
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xor %r8, %r8
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xor %r9, %r9
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xor %r10, %r10
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L(top): add (ap), %rax
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adc $0, %r10
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add 8(ap), %rcx
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adc $0, %r8
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add 16(ap), %rdx
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adc $0, %r9
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sub $3, %rsi
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jng L(end)
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add 24(ap), %rax
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adc $0, %r10
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add 32(ap), %rcx
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adc $0, %r8
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add 40(ap), %rdx
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lea 48(ap), ap
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adc $0, %r9
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sub $3, %rsi
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jg L(top)
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add $-24, ap
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L(end): add %r9, %rax
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adc %r10, %rcx
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adc %r8, %rdx
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inc %rsi
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mov $0x1, R32(%r10)
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js L(combine)
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mov $0x10000, R32(%r10)
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adc 24(ap), %rax
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dec %rsi
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js L(combine)
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adc 32(ap), %rcx
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mov $0x100000000, %r10
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L(combine):
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sbb %rsi, %rsi C carry
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mov %rax, %rdi C 0mod3
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shr $48, %rax C 0mod3 high
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and %r10, %rsi C carry masked
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and %r11, %rdi C 0mod3 low
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mov R32(%rcx), R32(%r10) C 1mod3
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add %rsi, %rax C apply carry
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shr $32, %rcx C 1mod3 high
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add %rdi, %rax C apply 0mod3 low
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movzwl %dx, R32(%rdi) C 2mod3
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shl $16, %r10 C 1mod3 low
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add %rcx, %rax C apply 1mod3 high
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shr $16, %rdx C 2mod3 high
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add %r10, %rax C apply 1mod3 low
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shl $32, %rdi C 2mod3 low
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add %rdx, %rax C apply 2mod3 high
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add %rdi, %rax C apply 2mod3 low
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FUNC_EXIT()
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ret
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EPILOGUE()
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CF_PROT
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