github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/mpn/s390_32/rshift.asm (about)

     1  dnl  S/390-32 mpn_rshift.
     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		 6
    35  C z990	         3
    36  C z9		 ?
    37  C z10		 ?
    38  C z196		 ?
    39  
    40  C TODO
    41  C  *
    42  
    43  C INPUT PARAMETERS
    44  define(`rp',	`%r2')
    45  define(`up',	`%r3')
    46  define(`n',	`%r4')
    47  define(`cnt',	`%r5')
    48  
    49  ASM_START()
    50  PROLOGUE(mpn_rshift)
    51  	stm	%r6, %r12, 24(%r15)
    52  	lhi	%r8, 32
    53  	sr	%r8, cnt
    54  	l	%r12, 0(up)
    55  	sll	%r12, 0(%r8)		C return value
    56  	lhi	%r7, 3
    57  	nr	%r7, n
    58  	srl	n, 2
    59  	je	L(b0)
    60  	chi	%r7, 2
    61  	jl	L(b1)
    62  	je	L(b2)
    63  
    64  L(b3):	l	%r11, 0(up)
    65  	l	%r10, 4(up)
    66  	l	%r8,  8(up)
    67  	ahi	up, 8
    68  	lr	%r9, %r10
    69  	srdl	%r10, 0(cnt)
    70  	srdl	%r8,  0(cnt)
    71  	st	%r11, 0(rp)
    72  	st	%r9,  4(rp)
    73  	ahi	rp, 8
    74  	ltr	n, n
    75  	je	L(end)
    76  	j	L(top)
    77  
    78  L(b2):	l	%r11, 0(up)
    79  	l	%r10, 4(up)
    80  	ahi	up, 4
    81  	srdl	%r10, 0(cnt)
    82  	st	%r11, 0(rp)
    83  	ahi	rp, 4
    84  	ltr	n, n
    85  	je	L(end)
    86  	j	L(top)
    87  
    88  L(b1):	ltr	n, n
    89  	je	L(end)
    90  	j	L(top)
    91  
    92  L(b0):	l	%r11, 0(up)
    93  	l	%r9,  4(up)
    94  	l	%r7,  8(up)
    95  	l	%r1, 12(up)
    96  	ahi	up, 12
    97  	lr	%r10, %r9
    98  	lr	%r8,  %r7
    99  	lr	%r6,  %r1
   100  	srdl	%r10, 0(cnt)
   101  	srdl	%r8,  0(cnt)
   102  	srdl	%r6,  0(cnt)
   103  	st	%r11, 0(rp)
   104  	st	%r9,  4(rp)
   105  	st	%r7,  8(rp)
   106  	ahi	rp, 12
   107  	ahi	n, -1
   108  	je	L(end)
   109  
   110  	ALIGN(8)
   111  L(top):	l	%r11, 0(up)
   112  	l	%r9,  4(up)
   113  	l	%r7,  8(up)
   114  	l	%r1, 12(up)
   115  	l	%r0, 16(up)
   116  	lr	%r10, %r9
   117  	lr	%r8,  %r7
   118  	lr	%r6,  %r1
   119  	ahi	up, 16
   120  	srdl	%r10, 0(cnt)
   121  	srdl	%r8,  0(cnt)
   122  	srdl	%r6,  0(cnt)
   123  	srdl	%r0,  0(cnt)
   124  	st	%r11, 0(rp)
   125  	st	%r9,  4(rp)
   126  	st	%r7,  8(rp)
   127  	st	%r1, 12(rp)
   128  	ahi	rp, 16
   129  	brct	n, L(top)
   130  
   131  L(end):	l	%r11, 0(up)
   132  	srl	%r11, 0(cnt)
   133  	st	%r11, 0(rp)
   134  
   135  	lr	%r2, %r12
   136  	lm	%r6, %r12, 24(%r15)
   137  	br	%r14
   138  EPILOGUE()