2009-03-05 12:50:57 -05:00
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; core2 mpn_diveby3
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; Copyright 2009 Jason Moxham
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; This file is part of the MPIR Library.
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; The MPIR 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
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; by the Free Software Foundation; either version 2.1 of the License, or (at
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; your option) any later version.
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; The MPIR 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 MPIR Library; see the file COPYING.LIB. If not, write
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; to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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; Boston, MA 02110-1301, USA.
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%include 'yasm_mac.inc'
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; (rdi, rdx) = (rsi, rdx) rcx = carry in
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; rax = carry out
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; NOTE could pass 55555...555 as next param so this would
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; be mpn_divexact_by_ff_over_c , and change imul at end , or
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; drop backwards compatibilty and just dump the two imuls
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BITS 64
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GLOBAL_FUNC mpn_divexact_by3c
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mov r9d, 3
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lea rsi, [rsi+rdx*8-24]
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lea rdi, [rdi+rdx*8-24]
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mov r8, 0x5555555555555555
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imul rcx, r8
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sub r9, rdx
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jnc skiploop
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align 16
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loop1:
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mov rax, [rsi+r9*8]
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mul r8
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sub rcx, rax
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mov [rdi+r9*8], rcx
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sbb rcx, rdx
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mov rax, [rsi+r9*8+8]
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mul r8
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sub rcx, rax
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mov [rdi+r9*8+8], rcx
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sbb rcx, rdx
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mov rax, [rsi+r9*8+16]
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mul r8
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sub rcx, rax
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mov [rdi+r9*8+16], rcx
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sbb rcx, rdx
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mov rax, [rsi+r9*8+24]
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mul r8
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sub rcx, rax
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mov [rdi+r9*8+24], rcx
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sbb rcx, rdx
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add r9, 4
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jnc loop1
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skiploop:
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test r9, 2
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jnz skip
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mov rax, [rsi+r9*8]
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mul r8
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sub rcx, rax
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mov [rdi+r9*8], rcx
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sbb rcx, rdx
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mov rax, [rsi+r9*8+8]
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mul r8
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sub rcx, rax
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mov [rdi+r9*8+8], rcx
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sbb rcx, rdx
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add r9, 2
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skip:
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test r9, 1
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jnz end
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mov rax, [rsi+r9*8]
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mul r8
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sub rcx, rax
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mov [rdi+r9*8], rcx
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sbb rcx, rdx
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end:
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imul rax, rcx, -3
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lea rax, [rcx+rcx*2]
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neg rax
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ret
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