2009-03-05 12:50:57 -05:00
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; AMD64 mpn_rshift
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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)>>rcx
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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_rshift
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mov eax, 64
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lea rsi, [rsi+rdx*8-32]
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lea rdi, [rdi+rdx*8-32]
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sub rax, rcx
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movq mm0, rcx
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mov r8d, 4
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sub r8, rdx
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movq mm1, rax
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movq mm5, [rsi+r8*8]
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movq mm3, mm5
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psllq mm5, mm1
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movq rax, mm5
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psrlq mm3, mm0
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jnc skiploop
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align 16
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loop1:
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movq mm2, [rsi+r8*8+8]
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movq mm4, mm2
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psllq mm2, mm1
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por mm3, mm2
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movq [rdi+r8*8], mm3
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psrlq mm4, mm0
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movq mm5, [rsi+r8*8+16]
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movq mm3, mm5
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psllq mm5, mm1
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por mm4, mm5
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movq [rdi+r8*8+8], mm4
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psrlq mm3, mm0
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; got room here for another jump out , if we can arrange our r8 to be
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; slightly different , so we can use a jz or jp here
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movq mm2, [rsi+r8*8+24]
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movq mm4, mm2
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psllq mm2, mm1
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por mm3, mm2
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movq [rdi+r8*8+16], mm3
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psrlq mm4, mm0
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movq mm5, [rsi+r8*8+32]
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movq mm3, mm5
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psllq mm5, mm1
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por mm4, mm5
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movq [rdi+r8*8+24], mm4
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psrlq mm3, mm0
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add r8, 4
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jnc loop1
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skiploop:
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test r8, 2
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jnz next
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movq mm2, [rsi+r8*8+8]
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movq mm4, mm2
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psllq mm2, mm1
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por mm3, mm2
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movq [rdi+r8*8], mm3
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psrlq mm4, mm0
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movq mm5, [rsi+r8*8+16]
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movq mm3, mm5
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psllq mm5, mm1
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por mm4, mm5
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movq [rdi+r8*8+8], mm4
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psrlq mm3, mm0
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add r8, 2
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next:
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test r8, 1
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jnz end
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movq mm2, [rsi+r8*8+8]
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movq mm4, mm2
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psllq mm2, mm1
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por mm3, mm2
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movq [rdi+r8*8], mm3
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psrlq mm4, mm0
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movq [rdi+r8*8+8], mm4
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emms
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ret
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end:
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movq [rdi+r8*8], mm3
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emms
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ret
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