github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/mpn/ia64/sqr_diag_addlsh1.asm (about)

     1  dnl  IA-64 mpn_sqr_diag_addlsh1
     2  
     3  dnl  Contributed to the GNU project by Torbjorn Granlund.
     4  
     5  dnl  Copyright 2010, 2011 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 Itanium:      ?
    37  C Itanium 2:    2	Unrolling could bring it to 1.5 + epsilon
    38  
    39  C Exact performance table.  The 2nd line is this code, the 3rd line is ctop-
    40  C less code.  In an assembly sqr_basecase, the ctop-full numbers will become a
    41  C few cycles better since we can mitigate the many I0 instructions.
    42  C
    43  C 1   2   3   4   5   6   7   8   9  10  11  12  13  14  15  16  17  18  19  20
    44  C -  20  22  24  26  28  30  32  34  36  38  40  42  44  46  48  50  52  54  56 Needs updating
    45  C -  13  16  17  18  20  21  23  25  26  30  31  31  33  34  36  38  39  42  43
    46  
    47  C We should keep in mind that this code takes linear time in a O(n^2) context
    48  C and that it will only be used under SQR_TOOM2_THRESHOLD, which might become
    49  C around 60.  Keeping overhead down for smallish operands (< 10) is more
    50  C important than optimal cycle counts.
    51  
    52  C TODO
    53  C  * Make sure we don't depend on uninitialised r-registers, f-registers, or
    54  C  * p-registers.
    55  C  * Optimise by doing first two loop iterations in function header.
    56  
    57  C INPUT PARAMETERS
    58  define(`rp_param', `r32')  define(`rp', `r14')		C size: 2n
    59  define(`tp_param', `r33')  define(`tp', `r15')		C size: 2n - 2
    60  define(`up_param', `r34')  define(`up', `r31')		C size: n
    61  define(`n',  `r35')
    62  
    63  ifdef(`HAVE_ABI_32',`
    64  	define(`ABI64', `')
    65  	define(`ABI32', `$1')
    66  ',`
    67  	define(`ABI64', `$1')
    68  	define(`ABI32', `')
    69  ')
    70  
    71  ASM_START()
    72  PROLOGUE(mpn_sqr_diag_addlsh1)
    73  
    74  	.prologue
    75  	.save	ar.pfs, r2
    76  	.save	ar.lc, r3
    77  	.body
    78  
    79   {.mii;		alloc	r2 = ar.pfs, 4,24,0,24	C			M
    80  		mov	r3 = ar.lc		C			I0
    81  	ABI64(`	nop	4711		')
    82  	ABI32(`	zxt4	n = n		')
    83  }{.mmi;	ABI64(`	mov	tp = tp_param	')	C			M I
    84  	ABI32(`	addp4	tp = 0, tp_param')	C			M I
    85  	ABI64(`	mov	up = up_param	')	C			M I
    86  	ABI32(`	addp4	up = 0, up_param')	C			M I
    87  	ABI64(`	mov	rp = rp_param	')	C			M I
    88  	ABI32(`	addp4	rp = 0, rp_param')	C			M I
    89  	;;
    90  }{.mmi;		ld8	r36 = [tp], 8		C			M
    91  		add	r20 = -2, n		C			M I
    92  		mov	r9 = ar.ec		C			I0
    93  	;;
    94  }{.mmi;		ld8	r32 = [tp], 8		C			M
    95  		mov	r16 = 0			C			M I
    96  		mov	ar.ec = 7		C			I0
    97  	;;
    98  }{.mmi;		nop	4711
    99  		mov	r44 = 0			C			M I
   100  		mov	ar.lc = r20		C			I0
   101  	;;
   102  }{.mii;		mov	r33 = 0
   103  		mov	r10 = pr		C			I0
   104  		mov	pr.rot = 0x30000	C			I0
   105  	;;
   106  }		br.cexit.spnt.few.clr	L(end)
   107  
   108  dnl *** MAIN LOOP START ***
   109  	ALIGN(32)
   110  L(top):
   111   {.mfi;	(p18)	ldf8	f33 = [up], 8		C			M
   112  	(p20)	xma.l	f36 = f35, f35, f42	C			F
   113  	(p41)	cmpequc	p50, p0 = -1, r44	C			M I
   114  }{.mfi;		setfsig	f40 = r16		C			M23
   115  	(p20)	xma.hu	f38 = f35, f35, f42	C			F
   116  	(p23)	add	r50 = r41, r49		C			M I
   117  	;;
   118  }{.mmi;	(p16)	ld8	r36 = [tp], 8		C			M
   119  	(p23)	cmpltu	p40, p0 = r50, r41	C cyout hi		M I
   120  	(p19)	shrp	r45 = r38, r35, 63	C non-critical		I0
   121  }{.mmi;	(p21)	getfsig	r39 = f39		C hi			M2
   122  	(p24)	st8	[rp] = r51, 8		C hi			M23
   123  	(p41)	add	r44 = 1, r44		C			M I
   124  	;;
   125  }{.mmi;	(p16)	ld8	r32 = [tp], 8		C			M
   126  	(p50)	cmpeqor	p40, p0 = -1, r50	C cyout hi		M I
   127  	(p17)	shrp	r16 = r33, r37, 63	C critical		I0
   128  }{.mmi;	(p21)	getfsig	r42 = f37		C lo			M2
   129  	(p23)	st8	[rp] = r44, 8		C lo			M23
   130  	(p50)	add	r50 = 1, r50		C			M I
   131  	;;
   132  }		br.ctop.sptk.few.clr L(top)	C			B
   133  dnl *** MAIN LOOP END ***
   134  	;;
   135  L(end):
   136   {.mmi;		nop	4711
   137  	(p41)	add	r44 = 1, r44		C			M I
   138  		shr.u	r48 = r39, 63		C			I0
   139  	;;
   140  }{.mmi;		st8	[rp] = r51, 8		C			M23
   141  	(p41)	cmpequc	p6, p0 = 0, r44		C			M I
   142  		add	r50 = r41, r48		C			M I
   143  	;;
   144  }{.mmi;		st8	[rp] = r44, 8		C			M23
   145  	(p6)	add	r50 = 1, r50		C			M I
   146  		mov	ar.lc = r3		C			I0
   147  	;;
   148  }{.mii;		st8	[rp] = r50		C			M23
   149  		mov	ar.ec = r9		C			I0
   150  		mov	pr = r10		C			I0
   151  	;;
   152  }{.mib;		nop	4711
   153  		mov	ar.pfs = r2		C			I0
   154  		br.ret.sptk.many b0		C			B
   155  }
   156  EPILOGUE()