github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/mpn/arm/v6/mul_2.asm (about)

     1  dnl  ARM mpn_mul_2.
     2  
     3  dnl  Contributed to the GNU project by Torbjörn Granlund.
     4  
     5  dnl  Copyright 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 ARM11		 5.25
    39  C Cortex-A7	 3.13
    40  C Cortex-A8	 5
    41  C Cortex-A9	 2.25
    42  C Cortex-A15	 2.5
    43  
    44  C TODO
    45  C  * This is a trivial edit of the addmul_2 code.  Check for simplifications,
    46  C    and possible speedups to 2.0 c/l.
    47  
    48  define(`rp',`r0')
    49  define(`up',`r1')
    50  define(`n', `r2')
    51  define(`vp',`r3')
    52  
    53  define(`v0',`r6')
    54  define(`v1',`r7')
    55  define(`u0',`r3')
    56  define(`u1',`r9')
    57  
    58  define(`cya',`r8')
    59  define(`cyb',`r12')
    60  
    61  
    62  ASM_START()
    63  PROLOGUE(mpn_mul_2)
    64  	push	{ r4, r5, r6, r7, r8, r9 }
    65  
    66  	ldm	vp, { v0, v1 }
    67  	mov	cya, #0
    68  	mov	cyb, #0
    69  
    70  	tst	n, #1
    71  	beq	L(evn)
    72  L(odd):	mov	r5, #0
    73  	ldr	u0, [up, #0]
    74  	mov	r4, #0
    75  	tst	n, #2
    76  	beq	L(fi1)
    77  L(fi3):	sub	up, up, #12
    78  	sub	rp, rp, #16
    79  	b	L(lo3)
    80  L(fi1):	sub	n, n, #1
    81  	sub	up, up, #4
    82  	sub	rp, rp, #8
    83  	b	L(lo1)
    84  L(evn):	mov	r4, #0
    85  	ldr	u1, [up, #0]
    86  	mov	r5, #0
    87  	tst	n, #2
    88  	bne	L(fi2)
    89  L(fi0):	sub	up, up, #8
    90  	sub	rp, rp, #12
    91  	b	L(lo0)
    92  L(fi2):	subs	n, n, #2
    93  	sub	rp, rp, #4
    94  	bls	L(end)
    95  
    96  	ALIGN(16)
    97  L(top):	ldr	u0, [up, #4]
    98  	umaal	r4, cya, u1, v0
    99  	str	r4, [rp, #4]
   100  	mov	r4, #0
   101  	umaal	r5, cyb, u1, v1
   102  L(lo1):	ldr	u1, [up, #8]
   103  	umaal	r5, cya, u0, v0
   104  	str	r5, [rp, #8]
   105  	mov	r5, #0
   106  	umaal	r4, cyb, u0, v1
   107  L(lo0):	ldr	u0, [up, #12]
   108  	umaal	r4, cya, u1, v0
   109  	str	r4, [rp, #12]
   110  	mov	r4, #0
   111  	umaal	r5, cyb, u1, v1
   112  L(lo3):	ldr	u1, [up, #16]!
   113  	umaal	r5, cya, u0, v0
   114  	str	r5, [rp, #16]!
   115  	mov	r5, #0
   116  	umaal	r4, cyb, u0, v1
   117  	subs	n, n, #4
   118  	bhi	L(top)
   119  
   120  L(end):	umaal	r4, cya, u1, v0
   121  	ldr	u0, [up, #4]
   122  	umaal	r5, cyb, u1, v1
   123  	str	r4, [rp, #4]
   124  	umaal	r5, cya, u0, v0
   125  	umaal	cya, cyb, u0, v1
   126  	str	r5, [rp, #8]
   127  	str	cya, [rp, #12]
   128  	mov	r0, cyb
   129  
   130  	pop	{ r4, r5, r6, r7, r8, r9 }
   131  	bx	r14
   132  EPILOGUE()