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

     1  dnl  PowerPC-32 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 603e:			 ?
    37  C 604e:			 ?
    38  C 75x (G3):		 ?
    39  C 7400,7410 (G4):	 2.5
    40  C 744x,745x (G4+):	 2.0
    41  C power4/ppc970:	 2.0
    42  C power5:		 ?
    43  
    44  define(`rp',     `r3')
    45  define(`tp',     `r4')
    46  define(`n',      `r5')
    47  define(`nents',  `r6')
    48  define(`which',  `r7')
    49  
    50  define(`i',      `r8')
    51  define(`j',      `r9')
    52  define(`stride', `r12')
    53  define(`mask',   `r11')
    54  
    55  
    56  ASM_START()
    57  PROLOGUE(mpn_sec_tabselect)
    58  	stwu	r1, -32(r1)
    59  	addic.	j, n, -4		C outer loop induction variable
    60  	stmw	r27, 8(r1)
    61  	slwi	stride, n, 2
    62  
    63  	blt	cr0, L(outer_end)
    64  L(outer_top):
    65  	mtctr	nents
    66  	mr	r10, tp
    67  	li	r28, 0
    68  	li	r29, 0
    69  	li	r30, 0
    70  	li	r31, 0
    71  	addic.	j, j, -4		C outer loop induction variable
    72  	mr	i, which
    73  
    74  	ALIGN(16)
    75  L(top):	addic	i, i, -1		C set carry iff i != 0
    76  	subfe	mask, mask, mask
    77  	lwz	r0, 0(tp)
    78  	lwz	r27, 4(tp)
    79  	and	r0, r0, mask
    80  	and	r27, r27, mask
    81  	or	r28, r28, r0
    82  	or	r29, r29, r27
    83  	lwz	r0, 8(tp)
    84  	lwz	r27, 12(tp)
    85  	and	r0, r0, mask
    86  	and	r27, r27, mask
    87  	or	r30, r30, r0
    88  	or	r31, r31, r27
    89  	add	tp, tp, stride
    90  	bdnz	L(top)
    91  
    92  	stw	r28, 0(rp)
    93  	stw	r29, 4(rp)
    94  	stw	r30, 8(rp)
    95  	stw	r31, 12(rp)
    96  	addi	tp, r10, 16
    97  	addi	rp, rp, 16
    98  	bge	cr0, L(outer_top)
    99  L(outer_end):
   100  
   101  	andi.	r0, n, 2
   102  	beq	cr0, L(b0x)
   103  L(b1x):	mtctr	nents
   104  	mr	r10, tp
   105  	li	r28, 0
   106  	li	r29, 0
   107  	mr	i, which
   108  	ALIGN(16)
   109  L(tp2):	addic	i, i, -1
   110  	subfe	mask, mask, mask
   111  	lwz	r0, 0(tp)
   112  	lwz	r27, 4(tp)
   113  	and	r0, r0, mask
   114  	and	r27, r27, mask
   115  	or	r28, r28, r0
   116  	or	r29, r29, r27
   117  	add	tp, tp, stride
   118  	bdnz	L(tp2)
   119  	stw	r28, 0(rp)
   120  	stw	r29, 4(rp)
   121  	addi	tp, r10, 8
   122  	addi	rp, rp, 8
   123  
   124  L(b0x):	andi.	r0, n, 1
   125  	beq	cr0, L(b00)
   126  L(b01):	mtctr	nents
   127  	mr	r10, tp
   128  	li	r28, 0
   129  	mr	i, which
   130  	ALIGN(16)
   131  L(tp1):	addic	i, i, -1
   132  	subfe	mask, mask, mask
   133  	lwz	r0, 0(tp)
   134  	and	r0, r0, mask
   135  	or	r28, r28, r0
   136  	add	tp, tp, stride
   137  	bdnz	L(tp1)
   138  	stw	r28, 0(rp)
   139  
   140  L(b00):	lmw	r27, 8(r1)
   141  	addi	r1, r1, 32
   142  	blr
   143  EPILOGUE()