github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/mpn/pa32/hppa2_0/sub_n.asm (about)

     1  dnl  HP-PA 2.0 32-bit mpn_sub_n -- Subtract two limb vectors of the same
     2  dnl  length > 0 and store difference in a third limb vector.
     3  
     4  dnl  Copyright 1997, 1998, 2000-2002 Free Software Foundation, Inc.
     5  
     6  dnl  This file is part of the GNU MP Library.
     7  dnl
     8  dnl  The GNU MP Library is free software; you can redistribute it and/or modify
     9  dnl  it under the terms of either:
    10  dnl
    11  dnl    * the GNU Lesser General Public License as published by the Free
    12  dnl      Software Foundation; either version 3 of the License, or (at your
    13  dnl      option) any later version.
    14  dnl
    15  dnl  or
    16  dnl
    17  dnl    * the GNU General Public License as published by the Free Software
    18  dnl      Foundation; either version 2 of the License, or (at your option) any
    19  dnl      later version.
    20  dnl
    21  dnl  or both in parallel, as here.
    22  dnl
    23  dnl  The GNU MP Library is distributed in the hope that it will be useful, but
    24  dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    25  dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    26  dnl  for more details.
    27  dnl
    28  dnl  You should have received copies of the GNU General Public License and the
    29  dnl  GNU Lesser General Public License along with the GNU MP Library.  If not,
    30  dnl  see https://www.gnu.org/licenses/.
    31  
    32  include(`../config.m4')
    33  
    34  C INPUT PARAMETERS
    35  C res_ptr	gr26
    36  C s1_ptr	gr25
    37  C s2_ptr	gr24
    38  C size		gr23
    39  
    40  C This runs at 2 cycles/limb on PA8000.
    41  
    42  ASM_START()
    43  PROLOGUE(mpn_sub_n)
    44  	sub		%r0,%r23,%r22
    45  	zdep		%r22,30,3,%r28		C r28 = 2 * (-n & 7)
    46  	zdep		%r22,29,3,%r22		C r22 = 4 * (-n & 7)
    47  	sub		%r25,%r22,%r25		C offset s1_ptr
    48  	sub		%r24,%r22,%r24		C offset s2_ptr
    49  	blr		%r28,%r0		C branch into loop
    50  	sub		%r26,%r22,%r26		C offset res_ptr and set carry
    51  
    52  LDEF(loop)
    53  	ldw		0(%r25),%r20
    54  	ldw		0(%r24),%r31
    55  	subb		%r20,%r31,%r20
    56  	stw		%r20,0(%r26)
    57  
    58  LDEF(7)
    59  	ldw		4(%r25),%r21
    60  	ldw		4(%r24),%r19
    61  	subb		%r21,%r19,%r21
    62  	stw		%r21,4(%r26)
    63  
    64  LDEF(6)
    65  	ldw		8(%r25),%r20
    66  	ldw		8(%r24),%r31
    67  	subb		%r20,%r31,%r20
    68  	stw		%r20,8(%r26)
    69  
    70  LDEF(5)
    71  	ldw		12(%r25),%r21
    72  	ldw		12(%r24),%r19
    73  	subb		%r21,%r19,%r21
    74  	stw		%r21,12(%r26)
    75  
    76  LDEF(4)
    77  	ldw		16(%r25),%r20
    78  	ldw		16(%r24),%r31
    79  	subb		%r20,%r31,%r20
    80  	stw		%r20,16(%r26)
    81  
    82  LDEF(3)
    83  	ldw		20(%r25),%r21
    84  	ldw		20(%r24),%r19
    85  	subb		%r21,%r19,%r21
    86  	stw		%r21,20(%r26)
    87  
    88  LDEF(2)
    89  	ldw		24(%r25),%r20
    90  	ldw		24(%r24),%r31
    91  	subb		%r20,%r31,%r20
    92  	stw		%r20,24(%r26)
    93  
    94  LDEF(1)
    95  	ldw		28(%r25),%r21
    96  	ldo		32(%r25),%r25
    97  	ldw		28(%r24),%r19
    98  	subb		%r21,%r19,%r21
    99  	stw		%r21,28(%r26)
   100  	ldo		32(%r24),%r24
   101  	addib,>		-8,%r23,L(loop)
   102  	ldo		32(%r26),%r26
   103  
   104  	addc		%r0,%r0,%r28
   105  	bv		(%r2)
   106  	subi		1,%r28,%r28
   107  EPILOGUE()