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f133d007f9
Old version was from 2012-05-06, 6.1.2 is from 2016-12-16 A lot of support for newer processors and speedups since then See gmp/NEWS for details
107 lines
2.4 KiB
NASM
107 lines
2.4 KiB
NASM
dnl x86 mpn_lshift -- mpn left shift.
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dnl Copyright 1992, 1994, 1996, 1999-2002 Free Software Foundation, Inc.
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dnl This file is part of the GNU MP Library.
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dnl
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dnl The GNU MP Library is free software; you can redistribute it and/or modify
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dnl it under the terms of either:
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dnl
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dnl * the GNU Lesser General Public License as published by the Free
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dnl Software Foundation; either version 3 of the License, or (at your
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dnl option) any later version.
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dnl
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dnl or
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dnl
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dnl * the GNU General Public License as published by the Free Software
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dnl Foundation; either version 2 of the License, or (at your option) any
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dnl later version.
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dnl
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dnl or both in parallel, as here.
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dnl
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dnl The GNU MP Library is distributed in the hope that it will be useful, but
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dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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dnl for more details.
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dnl
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dnl You should have received copies of the GNU General Public License and the
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dnl GNU Lesser General Public License along with the GNU MP Library. If not,
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dnl see https://www.gnu.org/licenses/.
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include(`../config.m4')
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C cycles/limb
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C P54 7.5
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C P55 7.0
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C P6 2.5
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C K6 4.5
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C K7 5.0
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C P4 14.5
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C mp_limb_t mpn_lshift (mp_ptr dst, mp_srcptr src, mp_size_t size,
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C unsigned shift);
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defframe(PARAM_SHIFT,16)
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defframe(PARAM_SIZE, 12)
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defframe(PARAM_SRC, 8)
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defframe(PARAM_DST, 4)
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TEXT
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ALIGN(8)
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PROLOGUE(mpn_lshift)
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pushl %edi
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pushl %esi
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pushl %ebx
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deflit(`FRAME',12)
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movl PARAM_DST,%edi
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movl PARAM_SRC,%esi
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movl PARAM_SIZE,%edx
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movl PARAM_SHIFT,%ecx
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subl $4,%esi C adjust src
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movl (%esi,%edx,4),%ebx C read most significant limb
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xorl %eax,%eax
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shldl( %cl, %ebx, %eax) C compute carry limb
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decl %edx
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jz L(end)
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pushl %eax C push carry limb onto stack
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testb $1,%dl
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jnz L(1) C enter loop in the middle
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movl %ebx,%eax
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ALIGN(8)
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L(oop): movl (%esi,%edx,4),%ebx C load next lower limb
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shldl( %cl, %ebx, %eax) C compute result limb
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movl %eax,(%edi,%edx,4) C store it
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decl %edx
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L(1): movl (%esi,%edx,4),%eax
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shldl( %cl, %eax, %ebx)
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movl %ebx,(%edi,%edx,4)
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decl %edx
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jnz L(oop)
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shll %cl,%eax C compute least significant limb
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movl %eax,(%edi) C store it
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popl %eax C pop carry limb
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popl %ebx
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popl %esi
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popl %edi
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ret
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L(end): shll %cl,%ebx C compute least significant limb
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movl %ebx,(%edi) C store it
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popl %ebx
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popl %esi
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popl %edi
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ret
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EPILOGUE()
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