137 lines
3.4 KiB
ArmAsm
137 lines
3.4 KiB
ArmAsm
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/* i80386 __mpn_sub_n -- Add two limb vectors of the same length > 0 and store
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sum in a third limb vector.
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Copyright (C) 1992-2022 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+8 /* space for 2 saved regs */
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#define RES PARMS
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#define S1 RES+4
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#define S2 S1+4
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#define SIZE S2+4
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.text
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ENTRY (__mpn_sub_n)
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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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movl RES(%esp),%edi
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cfi_rel_offset (edi, 4)
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movl S1(%esp),%esi
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cfi_rel_offset (esi, 0)
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movl S2(%esp),%edx
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movl SIZE(%esp),%ecx
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#if IBT_ENABLED
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pushl %ebx
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cfi_adjust_cfa_offset (4)
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cfi_rel_offset (ebx, 0)
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#endif
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movl %ecx,%eax
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shrl $3,%ecx /* compute count for unrolled loop */
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negl %eax
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andl $7,%eax /* get index where to start loop */
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jz L(oop) /* necessary special case for 0 */
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incl %ecx /* adjust loop count */
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shll $2,%eax /* adjustment for pointers... */
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subl %eax,%edi /* ... since they are offset ... */
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subl %eax,%esi /* ... by a constant when we ... */
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subl %eax,%edx /* ... enter the loop */
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shrl $2,%eax /* restore previous value */
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#if defined __CET__ && (__CET__ & 1) != 0
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leal -4(,%eax,4),%ebx /* Count for 4-byte endbr32 */
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#endif
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#ifdef PIC
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/* Calculate start address in loop for PIC. Due to limitations in some
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assemblers, Loop-L0-3 cannot be put into the leal */
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call L(0)
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cfi_adjust_cfa_offset (4)
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L(0): leal (%eax,%eax,8),%eax
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addl (%esp),%eax
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addl $(L(oop)-L(0)-3),%eax
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addl $4,%esp
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cfi_adjust_cfa_offset (-4)
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#else
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/* Calculate start address in loop for non-PIC. */
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leal (L(oop) - 3)(%eax,%eax,8),%eax
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#endif
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#if defined __CET__ && (__CET__ & 1) != 0
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addl %ebx,%eax /* Adjust for endbr32 */
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#endif
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jmp *%eax /* jump into loop */
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ALIGN (3)
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L(oop): movl (%esi),%eax
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sbbl (%edx),%eax
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movl %eax,(%edi)
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_CET_ENDBR
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movl 4(%esi),%eax
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sbbl 4(%edx),%eax
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movl %eax,4(%edi)
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_CET_ENDBR
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movl 8(%esi),%eax
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sbbl 8(%edx),%eax
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movl %eax,8(%edi)
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_CET_ENDBR
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movl 12(%esi),%eax
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sbbl 12(%edx),%eax
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movl %eax,12(%edi)
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_CET_ENDBR
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movl 16(%esi),%eax
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sbbl 16(%edx),%eax
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movl %eax,16(%edi)
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_CET_ENDBR
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movl 20(%esi),%eax
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sbbl 20(%edx),%eax
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movl %eax,20(%edi)
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_CET_ENDBR
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movl 24(%esi),%eax
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sbbl 24(%edx),%eax
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movl %eax,24(%edi)
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_CET_ENDBR
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movl 28(%esi),%eax
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sbbl 28(%edx),%eax
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movl %eax,28(%edi)
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leal 32(%edi),%edi
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leal 32(%esi),%esi
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leal 32(%edx),%edx
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decl %ecx
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jnz L(oop)
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sbbl %eax,%eax
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negl %eax
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#if defined __CET__ && (__CET__ & 1) != 0
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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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#endif
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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_sub_n)
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