114 lines
3.1 KiB
ArmAsm
114 lines
3.1 KiB
ArmAsm
/* 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, 1994, 1995, 1997, 1998, 2000 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, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA. */
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#include "sysdep.h"
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#include "asm-syntax.h"
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#include "bp-sym.h"
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#include "bp-asm.h"
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#define PARMS LINKAGE+8 /* space for 2 saved regs */
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#define RES PARMS
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#define S1 RES+PTR_SIZE
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#define S2 S1+PTR_SIZE
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#define SIZE S2+PTR_SIZE
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.text
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ENTRY (BP_SYM (__mpn_sub_n))
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ENTER
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pushl %edi
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pushl %esi
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movl RES(%esp),%edi
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movl S1(%esp),%esi
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movl S2(%esp),%edx
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movl SIZE(%esp),%ecx
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#if __BOUNDED_POINTERS__
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shll $2, %ecx /* convert limbs to bytes */
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CHECK_BOUNDS_BOTH_WIDE (%edi, RES(%esp), %ecx)
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CHECK_BOUNDS_BOTH_WIDE (%esi, S1(%esp), %ecx)
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CHECK_BOUNDS_BOTH_WIDE (%edx, S2(%esp), %ecx)
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shrl $2, %ecx
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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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#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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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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#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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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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movl 4(%esi),%eax
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sbbl 4(%edx),%eax
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movl %eax,4(%edi)
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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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movl 12(%esi),%eax
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sbbl 12(%edx),%eax
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movl %eax,12(%edi)
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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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movl 20(%esi),%eax
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sbbl 20(%edx),%eax
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movl %eax,20(%edi)
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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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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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popl %esi
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popl %edi
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LEAVE
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ret
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END (BP_SYM (__mpn_sub_n))
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