github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/mpn/powerpc64/sec_tabselect.asm (about)

     1  dnl  PowerPC-64 mpn_sec_tabselect.
     2  
     3  dnl  Contributed to the GNU project by Torbjörn Granlund.
     4  
     5  dnl  Copyright 2011-2013 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 POWER3/PPC630		 1.75
    37  C POWER4/PPC970		 2.0
    38  C POWER5		 ?
    39  C POWER6		 5.0
    40  C POWER7		 1.75
    41  
    42  define(`rp',     `r3')
    43  define(`tp',     `r4')
    44  define(`n',      `r5')
    45  define(`nents',  `r6')
    46  define(`which',  `r7')
    47  
    48  define(`i',      `r8')
    49  define(`j',      `r9')
    50  define(`stride', `r12')
    51  define(`mask',   `r11')
    52  
    53  
    54  ASM_START()
    55  PROLOGUE(mpn_sec_tabselect)
    56  	addic.	j, n, -4		C outer loop induction variable
    57  	std	r31, -8(r1)
    58  	std	r30, -16(r1)
    59  	std	r29, -24(r1)
    60  	std	r28, -32(r1)
    61  	std	r27, -40(r1)
    62  	sldi	stride, n, 3
    63  
    64  	blt	cr0, L(outer_end)
    65  L(outer_top):
    66  	mtctr	nents
    67  	mr	r10, tp
    68  	li	r28, 0
    69  	li	r29, 0
    70  	li	r30, 0
    71  	li	r31, 0
    72  	addic.	j, j, -4		C outer loop induction variable
    73  	mr	i, which
    74  
    75  	ALIGN(16)
    76  L(top):	addic	i, i, -1		C set carry iff i != 0
    77  	subfe	mask, mask, mask
    78  	ld	r0, 0(tp)
    79  	ld	r27, 8(tp)
    80  	and	r0, r0, mask
    81  	and	r27, r27, mask
    82  	or	r28, r28, r0
    83  	or	r29, r29, r27
    84  	ld	r0, 16(tp)
    85  	ld	r27, 24(tp)
    86  	and	r0, r0, mask
    87  	and	r27, r27, mask
    88  	or	r30, r30, r0
    89  	or	r31, r31, r27
    90  	add	tp, tp, stride
    91  	bdnz	L(top)
    92  
    93  	std	r28, 0(rp)
    94  	std	r29, 8(rp)
    95  	std	r30, 16(rp)
    96  	std	r31, 24(rp)
    97  	addi	tp, r10, 32
    98  	addi	rp, rp, 32
    99  	bge	cr0, L(outer_top)
   100  L(outer_end):
   101  
   102  	rldicl.	r0, n, 63, 63
   103  	beq	cr0, L(b0x)
   104  L(b1x):	mtctr	nents
   105  	mr	r10, tp
   106  	li	r28, 0
   107  	li	r29, 0
   108  	mr	i, which
   109  	ALIGN(16)
   110  L(tp2):	addic	i, i, -1
   111  	subfe	mask, mask, mask
   112  	ld	r0, 0(tp)
   113  	ld	r27, 8(tp)
   114  	and	r0, r0, mask
   115  	and	r27, r27, mask
   116  	or	r28, r28, r0
   117  	or	r29, r29, r27
   118  	add	tp, tp, stride
   119  	bdnz	L(tp2)
   120  	std	r28, 0(rp)
   121  	std	r29, 8(rp)
   122  	addi	tp, r10, 16
   123  	addi	rp, rp, 16
   124  
   125  L(b0x):	rldicl.	r0, n, 0, 63
   126  	beq	cr0, L(b00)
   127  L(b01):	mtctr	nents
   128  	mr	r10, tp
   129  	li	r28, 0
   130  	mr	i, which
   131  	ALIGN(16)
   132  L(tp1):	addic	i, i, -1
   133  	subfe	mask, mask, mask
   134  	ld	r0, 0(tp)
   135  	and	r0, r0, mask
   136  	or	r28, r28, r0
   137  	add	tp, tp, stride
   138  	bdnz	L(tp1)
   139  	std	r28, 0(rp)
   140  
   141  L(b00):	ld	r31, -8(r1)
   142  	ld	r30, -16(r1)
   143  	ld	r29, -24(r1)
   144  	ld	r28, -32(r1)
   145  	ld	r27, -40(r1)
   146  	blr
   147  EPILOGUE()