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

     1  dnl  SPARC v9 mpn_rshift
     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 1&2:	 2
    37  C UltraSPARC 3:		 2.5
    38  C UltraSPARC T1:	17.5
    39  C UltraSPARC T3:	 8
    40  C UltraSPARC T4:	 3
    41  
    42  C INPUT PARAMETERS
    43  define(`rp',     `%i0')
    44  define(`up',     `%i1')
    45  define(`n',      `%i2')
    46  define(`cnt',    `%i3')
    47  
    48  define(`tcnt',   `%i4')
    49  define(`retval', `%i5')
    50  define(`u0',     `%l0')
    51  define(`u1',     `%l1')
    52  define(`r0',     `%l6')
    53  define(`r1',     `%l7')
    54  define(`u0_off', `%o0')
    55  define(`u1_off', `%o1')
    56  define(`r0_off', `%o2')
    57  define(`r1_off', `%o3')
    58  
    59  ASM_START()
    60  	REGISTER(%g2,#scratch)
    61  	REGISTER(%g3,#scratch)
    62  PROLOGUE(mpn_rshift)
    63  	save	%sp, -176, %sp
    64  
    65  	sllx	n, 3, n
    66  	sub	%g0, cnt, tcnt
    67  
    68  	add	up, n, up
    69  	add	rp, n, rp
    70  
    71  	neg	n, n
    72  	sub	up, (2 * 8), u0_off
    73  	sub	rp, (5 * 8), r0_off
    74  
    75  	ldx	[n + up], u1		C WAS: up + 0
    76  	sub	u0_off, (1 * 8), u1_off
    77  	sub	r0_off, (1 * 8), r1_off
    78  
    79  	subcc	n, -(3 * 8), n
    80  	sllx	u1, tcnt, retval
    81  
    82  	bg,pn	%xcc, L(end12)
    83  	 srlx	u1, cnt, %l3
    84  
    85  	ldx	[n + u0_off], u0	C WAS: up + 0
    86  	subcc	n, -(2 * 8), n
    87  
    88  	ldx	[n + u1_off], u1	C WAS: up + 8
    89  
    90  	bg,pn	%xcc, L(end34)
    91  	 sllx	u0, tcnt, %l4
    92  
    93  	b,a	L(top)
    94  	ALIGN(16)
    95  L(top):
    96  	srlx	u0, cnt, %l2
    97  	or	%l3, %l4, r0
    98  
    99  	ldx	[n + u0_off], u0	C WAS: up + 0
   100  	sllx	u1, tcnt, %l5
   101  
   102  	stx	r0, [n + r0_off]	C WAS: rp + 0
   103  	subcc	n, -(2 * 8), n
   104  
   105  	srlx	u1, cnt, %l3
   106  	or	%l2, %l5, r1
   107  
   108  	ldx	[n + u1_off], u1	C WAS: up + 8
   109  	sllx	u0, tcnt, %l4
   110  
   111  	ble,pt	%xcc, L(top)
   112  	 stx	r1, [n + r1_off]	C WAS: rp + 8
   113  
   114  L(end34):
   115  	srlx	u0, cnt, %l2
   116  	or	%l3, %l4, r0
   117  
   118  	sllx	u1, tcnt, %l5
   119  	stx	r0, [n + r0_off]	C WAS: rp + 0
   120  
   121  	or	%l2, %l5, r1
   122  	sub	n, -(2 * 8), %o5
   123  
   124  	srlx	u1, cnt, %l3
   125  	stx	r1, [%o5 + r1_off]	C WAS: rp + 8
   126  
   127  L(end12):
   128  	andcc	n, 8, %g0
   129  	bz,pn	%xcc, L(done)
   130  	 nop
   131  
   132  	ldx	[n + u0_off], u1
   133  	sllx	u1, tcnt, %l4
   134  	or	%l3, %l4, r0
   135  	stx	r0, [r0_off + 24]
   136  	srlx	u1, cnt, %l3
   137  L(done):
   138  	stx	%l3, [r0_off + 32]
   139  
   140  	ret
   141  	restore retval, 0, %o0
   142  EPILOGUE()