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106 lines
2.5 KiB
ArmAsm
106 lines
2.5 KiB
ArmAsm
/* i80386 __mpn_rshift --
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Copyright (C) 1992-2020 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP 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 by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The GNU MP 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 GNU MP Library; see the file COPYING.LIB. If not,
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see <https://www.gnu.org/licenses/>. */
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#include "sysdep.h"
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#include "asm-syntax.h"
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#define PARMS 4+12 /* space for 3 saved regs */
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#define RES PARMS
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#define S RES+4
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#define SIZE S+4
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#define CNT SIZE+4
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.text
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ENTRY (__mpn_rshift)
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pushl %edi
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cfi_adjust_cfa_offset (4)
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pushl %esi
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cfi_adjust_cfa_offset (4)
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pushl %ebx
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cfi_adjust_cfa_offset (4)
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movl RES(%esp),%edi
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cfi_rel_offset (edi, 8)
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movl S(%esp),%esi
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cfi_rel_offset (esi, 4)
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movl SIZE(%esp),%edx
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movl CNT(%esp),%ecx
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leal -4(%edi,%edx,4),%edi
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leal (%esi,%edx,4),%esi
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negl %edx
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movl (%esi,%edx,4),%ebx /* read least significant limb */
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cfi_rel_offset (ebx, 0)
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cfi_remember_state
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xorl %eax,%eax
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shrdl %cl,%ebx,%eax /* compute carry limb */
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incl %edx
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jz L(end)
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pushl %eax /* push carry limb onto stack */
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cfi_adjust_cfa_offset (4)
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testb $1,%dl
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jnz L(1) /* enter loop in the middle */
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movl %ebx,%eax
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ALIGN (3)
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L(oop): movl (%esi,%edx,4),%ebx /* load next higher limb */
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shrdl %cl,%ebx,%eax /* compute result limb */
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movl %eax,(%edi,%edx,4) /* store it */
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incl %edx
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L(1): movl (%esi,%edx,4),%eax
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shrdl %cl,%eax,%ebx
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movl %ebx,(%edi,%edx,4)
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incl %edx
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jnz L(oop)
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shrl %cl,%eax /* compute most significant limb */
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movl %eax,(%edi) /* store it */
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popl %eax /* pop carry limb */
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cfi_adjust_cfa_offset (-4)
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popl %ebx
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cfi_adjust_cfa_offset (-4)
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cfi_restore (ebx)
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popl %esi
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cfi_adjust_cfa_offset (-4)
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cfi_restore (esi)
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popl %edi
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cfi_adjust_cfa_offset (-4)
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cfi_restore (edi)
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ret
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cfi_restore_state
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L(end): shrl %cl,%ebx /* compute most significant limb */
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movl %ebx,(%edi) /* store it */
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popl %ebx
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cfi_adjust_cfa_offset (-4)
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cfi_restore (ebx)
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popl %esi
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cfi_adjust_cfa_offset (-4)
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cfi_restore (esi)
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popl %edi
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cfi_adjust_cfa_offset (-4)
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cfi_restore (edi)
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ret
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END (__mpn_rshift)
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