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

     1  dnl  HP-PA mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
     2  dnl  store difference in a third limb vector.
     3  
     4  dnl  Copyright 1992, 1994, 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 One might want to unroll this as for other processors, but it turns out that
    41  C the data cache contention after a store makes such unrolling useless.  We
    42  C can't come under 5 cycles/limb anyway.
    43  
    44  ASM_START()
    45  PROLOGUE(mpn_sub_n)
    46  	ldws,ma		4(0,%r25),%r20
    47  	ldws,ma		4(0,%r24),%r19
    48  
    49  	addib,=		-1,%r23,L(end)	C check for (SIZE == 1)
    50  	 sub		%r20,%r19,%r28	C subtract first limbs ignoring cy
    51  
    52  LDEF(loop)
    53  	ldws,ma		4(0,%r25),%r20
    54  	ldws,ma		4(0,%r24),%r19
    55  	stws,ma		%r28,4(0,%r26)
    56  	addib,<>	-1,%r23,L(loop)
    57  	 subb		%r20,%r19,%r28
    58  
    59  LDEF(end)
    60  	stws		%r28,0(0,%r26)
    61  	addc		%r0,%r0,%r28
    62  	bv		0(%r2)
    63  	 subi		1,%r28,%r28
    64  EPILOGUE()