128 lines
2.9 KiB
NASM
128 lines
2.9 KiB
NASM
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; AMD64 mpn_rshift -- mpn right shift
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; Version 1.0.3.
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;
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; Copyright 2008 Jason Moxham
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; Windows Conversion CopyRight 2008 Brian Gladman
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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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; Calling interface:
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;
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; mp_limb_t mpn_rshift(
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; mp_ptr dst, rcx
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; mp_srcptr src, rdx
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; mp_size_t size, r8
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; unsigned shift r9
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; )
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;
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; This is an SEH leaf function (no unwind support needed)
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bits 64
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section .text
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global __gmpn_rshift
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%ifdef DLL
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export __gmpn_rshift
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%endif
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__gmpn_rshift:
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mov r8d, r8d
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mov r9d, r9d
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mov eax, 64
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lea rdx, [rdx+r8*8-32]
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lea rcx, [rcx+r8*8-32]
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sub rax, r9
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movq mm0, r9
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mov r9d, 4
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sub r9, r8
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movq mm1, rax
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movq mm5, [rdx+r9*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 .2
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align 16
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.1: movq mm2, [rdx+r9*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 [rcx+r9*8], mm3
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psrlq mm4, mm0
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movq mm5, [rdx+r9*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 [rcx+r9*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 r9 to be
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; slightly different , so we can use a jz or jp here
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movq mm2, [rdx+r9*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 [rcx+r9*8+16], mm3
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psrlq mm4, mm0
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movq mm5, [rdx+r9*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 [rcx+r9*8+24], mm4
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psrlq mm3, mm0
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add r9, 4
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jnc .1
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; r9 is 0,1,2,3 here , so we have 3-r9 limbs to do
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.2: test r9, 2
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jnz .3
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movq mm2, [rdx+r9*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 [rcx+r9*8], mm3
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psrlq mm4, mm0
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movq mm5, [rdx+r9*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 [rcx+r9*8+8], mm4
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psrlq mm3, mm0
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add r9, 2
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.3: test r9, 1
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jnz .4
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movq mm2, [rdx+r9*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 [rcx+r9*8], mm3
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psrlq mm4, mm0
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movq [rcx+r9*8+8], mm4
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emms
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ret
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.4: movq [rcx+r9*8], mm3
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emms
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ret
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end
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