github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/mpn/s390_64/aors_n.asm (about)

     1  dnl  S/390-64 mpn_add_n and mpn_sub_n.
     2  
     3  dnl  Copyright 2011 Free Software Foundation, Inc.
     4  
     5  dnl  This file is part of the GNU MP Library.
     6  dnl
     7  dnl  The GNU MP Library is free software; you can redistribute it and/or modify
     8  dnl  it under the terms of either:
     9  dnl
    10  dnl    * the GNU Lesser General Public License as published by the Free
    11  dnl      Software Foundation; either version 3 of the License, or (at your
    12  dnl      option) any later version.
    13  dnl
    14  dnl  or
    15  dnl
    16  dnl    * the GNU General Public License as published by the Free Software
    17  dnl      Foundation; either version 2 of the License, or (at your option) any
    18  dnl      later version.
    19  dnl
    20  dnl  or both in parallel, as here.
    21  dnl
    22  dnl  The GNU MP Library is distributed in the hope that it will be useful, but
    23  dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    24  dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    25  dnl  for more details.
    26  dnl
    27  dnl  You should have received copies of the GNU General Public License and the
    28  dnl  GNU Lesser General Public License along with the GNU MP Library.  If not,
    29  dnl  see https://www.gnu.org/licenses/.
    30  
    31  include(`../config.m4')
    32  
    33  C            cycles/limb
    34  C z900		 5.5
    35  C z990		 3
    36  C z9		 ?
    37  C z10		 6
    38  C z196		 ?
    39  
    40  C TODO
    41  C  * Optimise for small n
    42  C  * Use r0 and save/restore one less register
    43  C  * Using logops_n's v1 inner loop operand order make the loop about 20%
    44  C    faster, at the expense of highly alignment-dependent performance.
    45  
    46  C INPUT PARAMETERS
    47  define(`rp',	`%r2')
    48  define(`up',	`%r3')
    49  define(`vp',	`%r4')
    50  define(`n',	`%r5')
    51  
    52  ifdef(`OPERATION_add_n', `
    53    define(ADSB,		alg)
    54    define(ADSBCR,	alcgr)
    55    define(ADSBC,		alcg)
    56    define(RETVAL,`dnl
    57  	lghi	%r2, 0
    58  	alcgr	%r2, %r2')
    59    define(func,		mpn_add_n)
    60    define(func_nc,	mpn_add_nc)')
    61  ifdef(`OPERATION_sub_n', `
    62    define(ADSB,		slg)
    63    define(ADSBCR,	slbgr)
    64    define(ADSBC,		slbg)
    65    define(RETVAL,`dnl
    66  	slbgr	%r2, %r2
    67  	lcgr	%r2, %r2')
    68    define(func,		mpn_sub_n)
    69    define(func_nc,	mpn_sub_nc)')
    70  
    71  MULFUNC_PROLOGUE(mpn_add_n mpn_sub_n)
    72  
    73  ASM_START()
    74  PROLOGUE(func)
    75  	stmg	%r6, %r8, 48(%r15)
    76  
    77  	aghi	n, 3
    78  	lghi	%r7, 3
    79  	srlg	%r1, n, 2
    80  	ngr	%r7, n			C n mod 4
    81  	je	L(b1)
    82  	cghi	%r7, 2
    83  	jl	L(b2)
    84  	jne	L(b0)
    85  
    86  L(b3):	lmg	%r5, %r7, 0(up)
    87  	la	up, 24(up)
    88  	ADSB	%r5, 0(vp)
    89  	ADSBC	%r6, 8(vp)
    90  	ADSBC	%r7, 16(vp)
    91  	la	vp, 24(vp)
    92  	stmg	%r5, %r7, 0(rp)
    93  	la	rp, 24(rp)
    94  	brctg	%r1, L(top)
    95  	j	L(end)
    96  
    97  L(b0):	lmg	%r5, %r8, 0(up)		C This redundant insns is no mistake,
    98  	la	up, 32(up)		C it is needed to make main loop run
    99  	ADSB	%r5, 0(vp)		C fast for n = 0 (mod 4).
   100  	ADSBC	%r6, 8(vp)
   101  	j	L(m0)
   102  
   103  L(b1):	lg	%r5, 0(up)
   104  	la	up, 8(up)
   105  	ADSB	%r5, 0(vp)
   106  	la	vp, 8(vp)
   107  	stg	%r5, 0(rp)
   108  	la	rp, 8(rp)
   109  	brctg	%r1, L(top)
   110  	j	L(end)
   111  
   112  L(b2):	lmg	%r5, %r6, 0(up)
   113  	la	up, 16(up)
   114  	ADSB	%r5, 0(vp)
   115  	ADSBC	%r6, 8(vp)
   116  	la	vp, 16(vp)
   117  	stmg	%r5, %r6, 0(rp)
   118  	la	rp, 16(rp)
   119  	brctg	%r1, L(top)
   120  	j	L(end)
   121  
   122  L(top):	lmg	%r5, %r8, 0(up)
   123  	la	up, 32(up)
   124  	ADSBC	%r5, 0(vp)
   125  	ADSBC	%r6, 8(vp)
   126  L(m0):	ADSBC	%r7, 16(vp)
   127  	ADSBC	%r8, 24(vp)
   128  	la	vp, 32(vp)
   129  	stmg	%r5, %r8, 0(rp)
   130  	la	rp, 32(rp)
   131  	brctg	%r1, L(top)
   132  
   133  L(end):	RETVAL
   134  	lmg	%r6, %r8, 48(%r15)
   135  	br	%r14
   136  EPILOGUE()