106 lines
2.5 KiB
ActionScript
106 lines
2.5 KiB
ActionScript
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; AMD64 mpn_rshift1
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; Copyright 2008 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)>>1
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; rax = carry
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%include '../yasm_mac.inc'
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BITS 64
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GLOBAL_FUNC mpn_rshift1
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xor rax, rax
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lea rsi, [rsi+rdx*8-8]
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lea rdi, [rdi+rdx*8-8]
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mov r11, rdx
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and r11, 7
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inc r11
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shr rdx, 3
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; and clear carry flag
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cmp rdx, 0
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jz next
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align 16
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loop1:
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mov rcx, [rsi]
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mov r8, [rsi-8]
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mov r9, [rsi-16]
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mov r10, [rsi-24]
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rcr rcx, 1
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rcr r8, 1
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rcr r9, 1
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rcr r10, 1
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mov [rdi], rcx
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mov [rdi-8], r8
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mov [rdi-16], r9
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mov [rdi-24], r10
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mov rcx, [rsi-32]
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mov r8, [rsi-40]
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mov r9, [rsi-48]
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mov r10, [rsi-56]
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rcr rcx, 1
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rcr r8, 1
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rcr r9, 1
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rcr r10, 1
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mov [rdi-32], rcx
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mov [rdi-40], r8
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mov [rdi-48], r9
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mov [rdi-56], r10
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lea rsi, [rsi-64]
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dec rdx
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lea rdi, [rdi-64]
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jnz loop1
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next:
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dec r11
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jz end
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; Could suffer cache-bank conflicts in this tail part
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mov rcx, [rsi]
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rcr rcx, 1
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mov [rdi], rcx
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dec r11
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jz end
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mov rcx, [rsi-8]
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rcr rcx, 1
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mov [rdi-8], rcx
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dec r11
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jz end
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mov rcx, [rsi-16]
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rcr rcx, 1
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mov [rdi-16], rcx
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dec r11
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jz end
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mov rcx, [rsi-24]
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rcr rcx, 1
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mov [rdi-24], rcx
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dec r11
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jz end
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mov rcx, [rsi-32]
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rcr rcx, 1
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mov [rdi-32], rcx
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dec r11
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jz end
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mov rcx, [rsi-40]
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rcr rcx, 1
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mov [rdi-40], rcx
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dec r11
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jz end
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mov rcx, [rsi-48]
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rcr rcx, 1
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mov [rdi-48], rcx
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end:
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rcr rax, 1
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ret
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