github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/mpn/sparc32/v9/sub_n.asm (about)

     1  dnl  SPARC 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 2001 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  
    33  include(`../config.m4')
    34  
    35  C INPUT PARAMETERS
    36  define(rp,%o0)
    37  define(s1p,%o1)
    38  define(s2p,%o2)
    39  define(n,%o3)
    40  define(cy,%g1)
    41  
    42  C This code uses 64-bit operations on `o' and `g' registers.  It doesn't
    43  C require that `o' registers' upper 32 bits are preserved by the operating
    44  C system, but if they are not, they must be zeroed.  That is indeed what
    45  C happens at least on Slowaris 2.5 and 2.6.
    46  
    47  C On UltraSPARC 1 and 2, this code runs at 3 cycles/limb from the Dcache and at
    48  C about 10 cycles/limb from the Ecache.
    49  
    50  ASM_START()
    51  PROLOGUE(mpn_sub_n)
    52  	lduw	[s1p+0],%o4
    53  	lduw	[s2p+0],%o5
    54  	addcc	n,-2,n
    55  	bl,pn	%icc,L(end1)
    56  	lduw	[s1p+4],%g2
    57  	lduw	[s2p+4],%g3
    58  	be,pn	%icc,L(end2)
    59  	mov	0,cy
    60  
    61  	.align	16
    62  L(loop):
    63  	sub	%o4,%o5,%g4
    64  	add	rp,8,rp
    65  	lduw	[s1p+8],%o4
    66  	fitod	%f0,%f2
    67  C ---
    68  	sub	%g4,cy,%g4
    69  	addcc	n,-1,n
    70  	lduw	[s2p+8],%o5
    71  	fitod	%f0,%f2
    72  C ---
    73  	srlx	%g4,63,cy
    74  	add	s2p,8,s2p
    75  	stw	%g4,[rp-8]
    76  	be,pn	%icc,L(exito)+4
    77  C ---
    78  	sub	%g2,%g3,%g4
    79  	addcc	n,-1,n
    80  	lduw	[s1p+12],%g2
    81  	fitod	%f0,%f2
    82  C ---
    83  	sub	%g4,cy,%g4
    84  	add	s1p,8,s1p
    85  	lduw	[s2p+4],%g3
    86  	fitod	%f0,%f2
    87  C ---
    88  	srlx	%g4,63,cy
    89  	bne,pt	%icc,L(loop)
    90  	stw	%g4,[rp-4]
    91  C ---
    92  L(exite):
    93  	sub	%o4,%o5,%g4
    94  	sub	%g4,cy,%g4
    95  	srlx	%g4,63,cy
    96  	stw	%g4,[rp+0]
    97  	sub	%g2,%g3,%g4
    98  	sub	%g4,cy,%g4
    99  	stw	%g4,[rp+4]
   100  	retl
   101  	srlx	%g4,63,%o0
   102  
   103  L(exito):
   104  	sub	%g2,%g3,%g4
   105  	sub	%g4,cy,%g4
   106  	srlx	%g4,63,cy
   107  	stw	%g4,[rp-4]
   108  	sub	%o4,%o5,%g4
   109  	sub	%g4,cy,%g4
   110  	stw	%g4,[rp+0]
   111  	retl
   112  	srlx	%g4,63,%o0
   113  
   114  L(end1):
   115  	sub	%o4,%o5,%g4
   116  	stw	%g4,[rp+0]
   117  	retl
   118  	srlx	%g4,63,%o0
   119  
   120  L(end2):
   121  	sub	%o4,%o5,%g4
   122  	srlx	%g4,63,cy
   123  	stw	%g4,[rp+0]
   124  	sub	%g2,%g3,%g4
   125  	sub	%g4,cy,%g4
   126  	stw	%g4,[rp+4]
   127  	retl
   128  	srlx	%g4,63,%o0
   129  EPILOGUE(mpn_sub_n)