github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/mpn/powerpc32/750/com.asm (about)

     1  dnl  PowerPC 750 mpn_com -- mpn bitwise one's complement
     2  
     3  dnl  Copyright 2002, 2003 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  
    34  C                cycles/limb
    35  C 603e:            ?
    36  C 604e:            3.0
    37  C 75x (G3):        2.0
    38  C 7400,7410 (G4):  2.0
    39  C 744x,745x (G4+): 3.0
    40  
    41  C void mpn_com (mp_ptr dst, mp_srcptr src, mp_size_t size);
    42  C
    43  C This loop form is necessary for the claimed speed.
    44  
    45  ASM_START()
    46  PROLOGUE(mpn_com)
    47  
    48  	C r3	dst
    49  	C r4	src
    50  	C r5	size
    51  
    52  	mtctr	r5		C size
    53  	lwz	r5, 0(r4)	C src low limb
    54  
    55  	sub	r4, r4, r3	C src-dst
    56  	subi	r3, r3, 4	C dst-4
    57  
    58  	addi	r4, r4, 8	C src-dst+8
    59  	bdz	L(one)
    60  
    61  L(top):
    62  	C r3	&dst[i-1]
    63  	C r4	src-dst
    64  	C r5	src[i]
    65  	C r6	scratch
    66  
    67  	not	r6, r5		C ~src[i]
    68  	lwzx	r5, r4,r3	C src[i+1]
    69  
    70  	stwu	r6, 4(r3)	C dst[i]
    71  	bdnz	L(top)
    72  
    73  L(one):
    74  	not	r6, r5
    75  
    76  	stw	r6, 4(r3)	C dst[size-1]
    77  	blr
    78  
    79  EPILOGUE()