github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/mpn/sparc64/ultrasparct3/sub_n.asm (about)

     1  dnl  SPARC v9 mpn_sub_n for T3/T4.
     2  
     3  dnl  Contributed to the GNU project by David Miller.
     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 UltraSPARC T3:	 8
    37  C UltraSPARC T4:	 3
    38  
    39  C INPUT PARAMETERS
    40  define(`rp', `%i0')
    41  define(`up', `%i1')
    42  define(`vp', `%i2')
    43  define(`n',  `%i3')
    44  define(`cy', `%i4')
    45  
    46  define(`u0_off', `%l0')
    47  define(`u1_off', `%l1')
    48  define(`v0_off', `%l2')
    49  define(`v1_off', `%l3')
    50  define(`r0_off', `%l4')
    51  define(`r1_off', `%l5')
    52  define(`loop_n', `%l6')
    53  define(`tmp', `%l7')
    54  
    55  ASM_START()
    56  	REGISTER(%g2,#scratch)
    57  	REGISTER(%g3,#scratch)
    58  PROLOGUE(mpn_sub_nc)
    59  	save	%sp, -176, %sp
    60  	ba,pt	%xcc, L(ent)
    61  	 xor	cy, 1, cy
    62  EPILOGUE()
    63  PROLOGUE(mpn_sub_n)
    64  	save	%sp, -176, %sp
    65  	mov	1, cy
    66  L(ent):
    67  	subcc	n, 1, n
    68  	be	L(final_one)
    69  	 cmp	%g0, cy
    70  
    71  	ldx	[up + 0], %o4
    72  	sllx	n, 3, tmp
    73  
    74  	ldx	[vp + 0], %o5
    75  	add	up, tmp, u0_off
    76  
    77  	ldx	[up + 8], %g5
    78  	add	vp, tmp, v0_off
    79  
    80  	ldx	[vp + 8], %g1
    81  	add	rp, tmp, r0_off
    82  
    83  	neg	tmp, loop_n
    84  	add	u0_off, 8, u1_off
    85  
    86  	add	v0_off, 8, v1_off
    87  	sub	loop_n, -(2 * 8), loop_n
    88  
    89  	sub	r0_off, 16, r0_off
    90  	brgez,pn loop_n, L(loop_tail)
    91  	 sub	r0_off, 8, r1_off
    92  
    93  	b,a	L(top)
    94  	ALIGN(16)
    95  L(top):
    96  	xnor	%o5, 0, tmp
    97  	ldx	[loop_n + v0_off], %o5
    98  
    99  	addxccc(%o4, tmp, %g3)
   100  	ldx	[loop_n + u0_off], %o4
   101  
   102  	xnor	%g1, 0, %g1
   103  	stx	%g3, [loop_n + r0_off]
   104  
   105  	addxccc(%g5, %g1, tmp)
   106  	ldx	[loop_n + v1_off], %g1
   107  
   108  	ldx	[loop_n + u1_off], %g5
   109  	sub	loop_n, -(2 * 8), loop_n
   110  
   111  	brlz	loop_n, L(top)
   112  	 stx	tmp, [loop_n + r1_off]
   113  
   114  L(loop_tail):
   115  	xnor	%o5, 0, tmp
   116  	xnor	%g1, 0, %g1
   117  
   118  	addxccc(%o4, tmp, %g3)
   119  	add	loop_n, u0_off, up
   120  
   121  	addxccc(%g5, %g1, %g5)
   122  	add	loop_n, r0_off, rp
   123  
   124  	stx	%g3, [rp + 0]
   125  	add	loop_n, v0_off, vp
   126  
   127  	brgz,pt	loop_n, L(done)
   128  	 stx	%g5, [rp + 8]
   129  
   130  	add	rp, (2 * 8), rp
   131  
   132  L(final_one):
   133  	ldx	[up+0], %o4
   134  	ldx	[vp+0], %o5
   135  	xnor	%o5, %g0, %o5
   136  	addxccc(%o4, %o5, %g3)
   137  	stx	%g3, [rp+0]
   138  
   139  L(done):
   140  	clr	%i0
   141  	movcc	%xcc, 1, %i0
   142  	ret
   143  	 restore
   144  EPILOGUE()