github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/mpn/arm/v7a/cora15/com.asm (about)

     1  dnl  ARM mpn_com optimised for A15.
     2  
     3  dnl  Contributed to the GNU project by Torbjörn Granlund.
     4  
     5  dnl  Copyright 2013 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
    41  C Cortex-A15	1.0
    42  
    43  C This is great A15 core register code, but it is a bit large.
    44  C We use FEEDIN_VARIANT 1 to save some space, but use 8-way unrolling.
    45  
    46  C Architecture requirements:
    47  C v5	-
    48  C v5t	-
    49  C v5te	ldrd strd
    50  C v6	-
    51  C v6t2	-
    52  C v7a	-
    53  
    54  define(`FEEDIN_VARIANT', 1)	C alternatives: 0 1 2
    55  define(`UNROLL', 4x2)		C alternatives: 4 4x2
    56  
    57  define(`rp', `r0')
    58  define(`up', `r1')
    59  define(`n',  `r2')
    60  
    61  ASM_START()
    62  PROLOGUE(mpn_com)
    63  	push	{ r4-r5,r8-r9 }
    64  
    65  ifelse(FEEDIN_VARIANT,0,`
    66  	ands	r12, n, #3
    67  	mov	n, n, lsr #2
    68  	beq	L(b00a)
    69  	tst	r12, #1
    70  	beq	L(bx0)
    71  	ldr	r5, [up], #4
    72  	mvn	r9, r5
    73  	str	r9, [rp], #4
    74  	tst	r12, #2
    75  	beq	L(b00)
    76  L(bx0):	ldrd	r4, r5, [up, #0]
    77  	sub	rp, rp, #8
    78  	b	L(lo)
    79  L(b00):	tst	n, n
    80  	beq	L(wd1)
    81  L(b00a):ldrd	r4, r5, [up], #-8
    82  	sub	rp, rp, #16
    83  	b	L(mid)
    84  ')
    85  ifelse(FEEDIN_VARIANT,1,`
    86  	and	r12, n, #3
    87  	mov	n, n, lsr #2
    88  	tst	r12, #1
    89  	beq	L(bx0)
    90  	ldr	r5, [up], #4
    91  	mvn	r9, r5
    92  	str	r9, [rp], #4
    93  L(bx0):	tst	r12, #2
    94  	beq	L(b00)
    95  	ldrd	r4, r5, [up, #0]
    96  	sub	rp, rp, #8
    97  	b	L(lo)
    98  L(b00):	tst	n, n
    99  	beq	L(wd1)
   100  	ldrd	r4, r5, [up], #-8
   101  	sub	rp, rp, #16
   102  	b	L(mid)
   103  ')
   104  ifelse(FEEDIN_VARIANT,2,`
   105  	ands	r12, n, #3
   106  	mov	n, n, lsr #2
   107  	beq	L(b00)
   108  	cmp	r12, #2
   109  	bcc	L(b01)
   110  	beq	L(b10)
   111  
   112  L(b11):	ldr	r5, [up], #4
   113  	mvn	r9, r5
   114  	ldrd	r4, r5, [up, #0]
   115  	str	r9, [rp], #-4
   116  	b	L(lo)
   117  
   118  L(b00):	ldrd	r4, r5, [up], #-8
   119  	sub	rp, rp, #16
   120  	b	L(mid)
   121  
   122  L(b01):	ldr	r5, [up], #-4
   123  	mvn	r9, r5
   124  	str	r9, [rp], #-12
   125  	tst	n, n
   126  	beq	L(wd1)
   127  L(gt1):	ldrd	r4, r5, [up, #8]
   128  	b	L(mid)
   129  
   130  L(b10):	ldrd	r4, r5, [up]
   131  	sub	rp, rp, #8
   132  	b	L(lo)
   133  ')
   134  	ALIGN(16)
   135  ifelse(UNROLL,4,`
   136  L(top):	ldrd	r4, r5, [up, #8]
   137  	strd	r8, r9, [rp, #8]
   138  L(mid):	mvn	r8, r4
   139  	mvn	r9, r5
   140  	ldrd	r4, r5, [up, #16]!
   141  	strd	r8, r9, [rp, #16]!
   142  	sub	n, n, #1
   143  L(lo):	mvn	r8, r4
   144  	mvn	r9, r5
   145  	tst	n, n
   146  	bne	L(top)
   147  ')
   148  ifelse(UNROLL,4x2,`
   149  L(top):	ldrd	r4, r5, [up, #8]
   150  	strd	r8, r9, [rp, #8]
   151  L(mid):	mvn	r8, r4
   152  	mvn	r9, r5
   153  	ldrd	r4, r5, [up, #16]
   154  	strd	r8, r9, [rp, #16]
   155  	mvn	r8, r4
   156  	mvn	r9, r5
   157  	sub	n, n, #2
   158  	tst	n, n
   159  	bmi	L(dne)
   160  	ldrd	r4, r5, [up, #24]
   161  	strd	r8, r9, [rp, #24]
   162  	mvn	r8, r4
   163  	mvn	r9, r5
   164  	ldrd	r4, r5, [up, #32]!
   165  	strd	r8, r9, [rp, #32]!
   166  L(lo):	mvn	r8, r4
   167  	mvn	r9, r5
   168  	tst	n, n
   169  	bne	L(top)
   170  ')
   171  
   172  L(end):	strd	r8, r9, [rp, #8]
   173  L(wd1):	pop	{ r4-r5,r8-r9 }
   174  	bx	r14
   175  ifelse(UNROLL,4x2,`
   176  L(dne):	strd	r8, r9, [rp, #24]
   177  	pop	{ r4-r5,r8-r9 }
   178  	bx	r14
   179  ')
   180  EPILOGUE()