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add_n.asm revision 1.1.1.1 
      1 dnl  SPARC v9 mpn_add_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', `%l2')
     47 define(`u1_off', `%l3')
     48 define(`loop_n', `%l6')
     49 define(`tmp', `%l7')
     50 
     51 ASM_START()
     52 	REGISTER(%g2,#scratch)
     53 	REGISTER(%g3,#scratch)
     54 PROLOGUE(mpn_add_nc)
     55 	save	%sp, -176, %sp
     56 	b,a	L(ent)
     57 EPILOGUE()
     58 PROLOGUE(mpn_add_n)
     59 	save	%sp, -176, %sp
     60 
     61 	mov	0, cy
     62 L(ent):
     63 	subcc	n, 1, n
     64 	be	L(final_one)
     65 	 cmp	%g0, cy
     66 
     67 	ldx	[up + 0], %o4
     68 	sllx	n, 3, tmp
     69 
     70 	ldx	[vp + 0], %o5
     71 	add	up, tmp, u0_off
     72 
     73 	ldx	[up + 8], %g5
     74 	neg	tmp, loop_n
     75 
     76 	ldx	[vp + 8], %g1
     77 	add	u0_off, 8, u1_off
     78 
     79 	sub	loop_n, -(2 * 8), loop_n
     80 
     81 	brgez,pn loop_n, L(loop_tail)
     82 	 add	vp, (2 * 8), vp
     83 
     84 	b,a	L(top)
     85 	ALIGN(16)
     86 L(top):
     87 	addxccc(%o4, %o5, tmp)
     88 	ldx	[vp + 0], %o5
     89 
     90 	add	rp, (2 * 8), rp
     91 	ldx	[loop_n + u0_off], %o4
     92 
     93 	add	vp, (2 * 8), vp
     94 	stx	tmp, [rp - 16]
     95 
     96 	addxccc(%g1, %g5, tmp)
     97 	ldx	[vp - 8], %g1
     98 
     99 	ldx	[loop_n + u1_off], %g5
    100 	sub	loop_n, -(2 * 8), loop_n
    101 
    102 	brlz	loop_n, L(top)
    103 	 stx	tmp, [rp - 8]
    104 
    105 L(loop_tail):
    106 	addxccc(%o4, %o5, %g3)
    107 	add	loop_n, u0_off, up
    108 
    109 	addxccc(%g1, %g5, %g5)
    110 	stx	%g3, [rp + 0]
    111 
    112 	brgz,pt	loop_n, L(done)
    113 	 stx	%g5, [rp + 8]
    114 
    115 	add	rp, (2 * 8), rp
    116 L(final_one):
    117 	ldx	[up+0], %o4
    118 	ldx	[vp+0], %o5
    119 	addxccc(%o4, %o5, %g3)
    120 	stx	%g3, [rp+0]
    121 
    122 L(done):
    123 	addxc(%g0, %g0, %i0)
    124 	ret
    125 	 restore
    126 EPILOGUE()
    127