2009-03-05 12:50:57 -05:00
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; AMD64 mpn_divexact_byff
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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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; (rdi, rdx) = (rsi, rdx)/0xFFFFFFFFFFFFFFFF
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; rax = "remainder"
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; where (rsi, rdx) = (rdi, rdx)*(B-1) -rax*B^rdx and 0 <= rax < B - 1 B = 0xFFFFFFFFFFFFFFFF
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%include 'yasm_mac.inc'
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BITS 64
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GLOBAL_FUNC mpn_divexact_byff
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; this is good but suffers from alignment slowdown
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; we dont seem to have much freedom to re-arrange the instructions to avoid
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; it , I suppose we could detect alignment at the start and have different
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; routines for different alignments
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xor eax, eax
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mov rcx, rdx
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and rcx, 3
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shr rdx, 2
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cmp rdx, 0
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; carry flag is clear here
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jnz loop1
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sbb rax, [rsi]
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mov [rdi], rax
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dec rcx
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jz end1
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sbb rax, [rsi+8]
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mov [rdi+8], rax
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dec rcx
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jz end1
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sbb rax, [rsi+16]
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mov [rdi+16], rax
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dec rcx
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end1:
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sbb rax, 0
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ret
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align 16
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loop1:
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sbb rax, [rsi]
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mov [rdi], rax
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sbb rax, [rsi+8]
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mov [rdi+8], rax
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sbb rax, [rsi+16]
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mov [rdi+16], rax
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sbb rax, [rsi+24]
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mov [rdi+24], rax
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lea rsi, [rsi+32]
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dec rdx
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lea rdi, [rdi+32]
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jnz loop1
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inc rcx
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dec rcx
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jz end
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sbb rax, [rsi]
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mov [rdi], rax
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dec rcx
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jz end
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sbb rax, [rsi+8]
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mov [rdi+8], rax
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dec rcx
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jz end
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sbb rax, [rsi+16]
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mov [rdi+16], rax
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dec rcx
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end:
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sbb rax, 0
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ret
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