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

     1  dnl  S/390-32/esame mpn_mul_basecase.
     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		 ?
    35  C z990		 ?
    36  C z9		 ?
    37  C z10		 ?
    38  C z196		 ?
    39  
    40  C TODO
    41  C  * Perhaps add special case for un <= 2.
    42  C  * Replace loops by faster code.  The mul_1 and addmul_1 loops could be sped
    43  C    up by about 10%.
    44  
    45  C INPUT PARAMETERS
    46  define(`rp',	`%r2')
    47  define(`up',	`%r3')
    48  define(`un',	`%r4')
    49  define(`vp',	`%r5')
    50  define(`vn',	`%r6')
    51  
    52  define(`zero',	`%r8')
    53  
    54  ASM_START()
    55  PROLOGUE(mpn_mul_basecase)
    56  	chi	un, 2
    57  	jhe	L(ge2)
    58  
    59  C un = vn = 1
    60  	l	%r1, 0(vp)
    61  	ml	%r0, 0(up)
    62  	st	%r1, 0(rp)
    63  	st	%r0, 4(rp)
    64  	br	%r14
    65  
    66  L(ge2):	C jne	L(gen)
    67  
    68  
    69  L(gen):
    70  C mul_1 =======================================================================
    71  
    72  	stm	%r6, %r12, 24(%r15)
    73  	lhi	zero, 0
    74  	ahi	un, -1
    75  
    76  	l	%r7, 0(vp)
    77  	l	%r11, 0(up)
    78  	lhi	%r12, 4			C init index register
    79  	mlr	%r10, %r7
    80  	lr	%r9, un
    81  	st	%r11, 0(rp)
    82  	cr	%r15, %r15		C clear carry flag
    83  
    84  L(tm):	l	%r1, 0(%r12,up)
    85  	mlr	%r0, %r7
    86  	alcr	%r1, %r10
    87  	lr	%r10, %r0		C copy high part to carry limb
    88  	st	%r1, 0(%r12,rp)
    89  	la	%r12, 4(%r12)
    90  	brct	%r9, L(tm)
    91  
    92  	alcr	%r0, zero
    93  	st	%r0, 0(%r12,rp)
    94  
    95  C addmul_1 loop ===============================================================
    96  
    97  	ahi	vn, -1
    98  	je	L(outer_end)
    99  L(outer_loop):
   100  
   101  	la	rp, 4(rp)		C rp += 1
   102  	la	vp, 4(vp)		C up += 1
   103  	l	%r7, 0(vp)
   104  	l	%r11, 0(up)
   105  	lhi	%r12, 4			C init index register
   106  	mlr	%r10, %r7
   107  	lr	%r9, un
   108  	al	%r11, 0(rp)
   109  	st	%r11, 0(rp)
   110  
   111  L(tam):	l	%r1, 0(%r12,up)
   112  	l	%r11, 0(%r12,rp)
   113  	mlr	%r0, %r7
   114  	alcr	%r1, %r11
   115  	alcr	%r0, zero
   116  	alr	%r1, %r10
   117  	lr	%r10, %r0
   118  	st	%r1, 0(%r12,rp)
   119  	la	%r12, 4(%r12)
   120  	brct	%r9, L(tam)
   121  
   122  	alcr	%r0, zero
   123  	st	%r0, 0(%r12,rp)
   124  
   125  	brct	vn, L(outer_loop)
   126  L(outer_end):
   127  
   128  	lm	%r6, %r12, 24(%r15)
   129  	br	%r14
   130  EPILOGUE()