github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/mpn/arm/aors_n.asm (about)

     1  dnl  ARM mpn_add_n and mpn_sub_n
     2  
     3  dnl  Contributed to the GNU project by Robert Harley.
     4  
     5  dnl  Copyright 1997, 2000, 2001, 2012 Free Software Foundation, Inc.
     6  
     7  dnl  This file is part of the GNU MP Library.
     8  dnl
     9  dnl  The GNU MP Library is free software; you can redistribute it and/or modify
    10  dnl  it under the terms of either:
    11  dnl
    12  dnl    * the GNU Lesser General Public License as published by the Free
    13  dnl      Software Foundation; either version 3 of the License, or (at your
    14  dnl      option) any later version.
    15  dnl
    16  dnl  or
    17  dnl
    18  dnl    * the GNU General Public License as published by the Free Software
    19  dnl      Foundation; either version 2 of the License, or (at your option) any
    20  dnl      later version.
    21  dnl
    22  dnl  or both in parallel, as here.
    23  dnl
    24  dnl  The GNU MP Library is distributed in the hope that it will be useful, but
    25  dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    26  dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    27  dnl  for more details.
    28  dnl
    29  dnl  You should have received copies of the GNU General Public License and the
    30  dnl  GNU Lesser General Public License along with the GNU MP Library.  If not,
    31  dnl  see https://www.gnu.org/licenses/.
    32  
    33  include(`../config.m4')
    34  
    35  C	     cycles/limb
    36  C StrongARM	 ?
    37  C XScale	 ?
    38  C Cortex-A7	 ?
    39  C Cortex-A8	 ?
    40  C Cortex-A9	 2.5	slightly fluctuating
    41  C Cortex-A15	 2.25
    42  
    43  define(`rp', `r0')
    44  define(`up', `r1')
    45  define(`vp', `r2')
    46  define(`n',  `r3')
    47  
    48  ifdef(`OPERATION_add_n', `
    49    define(`ADDSUB',	adds)
    50    define(`ADDSUBC',	adcs)
    51    define(`CLRCY',	`cmn	r0, #0')
    52    define(`SETCY',	`cmp	$1, #1')
    53    define(`RETVAL',	`adc	r0, n, #0')
    54    define(`func',	mpn_add_n)
    55    define(`func_nc',	mpn_add_nc)')
    56  ifdef(`OPERATION_sub_n', `
    57    define(`ADDSUB',	subs)
    58    define(`ADDSUBC',	sbcs)
    59    define(`CLRCY',	`cmp	r0, r0')
    60    define(`SETCY',	`rsbs	$1, $1, #0')
    61    define(`RETVAL',	`sbc	r0, r0, r0
    62  			and	r0, r0, #1')
    63    define(`func',	mpn_sub_n)
    64    define(`func_nc',	mpn_sub_nc)')
    65  
    66  MULFUNC_PROLOGUE(mpn_add_n mpn_add_nc mpn_sub_n mpn_sub_nc)
    67  
    68  ASM_START()
    69  PROLOGUE(func_nc)
    70  	ldr	r12, [sp, #0]
    71  	stmfd	sp!, { r8, r9, lr }
    72  	SETCY(	r12)
    73  	b	L(ent)
    74  EPILOGUE()
    75  PROLOGUE(func)
    76  	stmfd	sp!, { r8, r9, lr }
    77  	CLRCY(	r12)
    78  L(ent):	tst	n, #1
    79  	beq	L(skip1)
    80  	ldr	r12, [up], #4
    81  	ldr	lr, [vp], #4
    82  	ADDSUBC	r12, r12, lr
    83  	str	r12, [rp], #4
    84  L(skip1):
    85  	tst	n, #2
    86  	beq	L(skip2)
    87  	ldmia	up!, { r8, r9 }
    88  	ldmia	vp!, { r12, lr }
    89  	ADDSUBC	r8, r8, r12
    90  	ADDSUBC	r9, r9, lr
    91  	stmia	rp!, { r8, r9 }
    92  L(skip2):
    93  	bics	n, n, #3
    94  	beq	L(rtn)
    95  	stmfd	sp!, { r4, r5, r6, r7 }
    96  
    97  L(top):	ldmia	up!, { r4, r5, r6, r7 }
    98  	ldmia	vp!, { r8, r9, r12, lr }
    99  	ADDSUBC	r4, r4, r8
   100  	sub	n, n, #4
   101  	ADDSUBC	r5, r5, r9
   102  	ADDSUBC	r6, r6, r12
   103  	ADDSUBC	r7, r7, lr
   104  	stmia	rp!, { r4, r5, r6, r7 }
   105  	teq	n, #0
   106  	bne	L(top)
   107  
   108  	ldmfd	sp!, { r4, r5, r6, r7 }
   109  
   110  L(rtn):	RETVAL
   111  	ldmfd	sp!, { r8, r9, pc }
   112  EPILOGUE()