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

     1  dnl  IA-64 mpn_invert_limb -- Invert a normalized limb.
     2  
     3  dnl  Contributed to the GNU project by Torbjorn Granlund and Kevin Ryde.
     4  
     5  dnl  Copyright 2000, 2002, 2004 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 INPUT PARAMETERS
    36  C d = r32
    37  
    38  C           cycles
    39  C Itanium:    74
    40  C Itanium 2:  50+6
    41  
    42  C It should be possible to avoid the xmpy.hu and the following tests by
    43  C explicitly chopping in the last fma.  That would save about 10 cycles.
    44  
    45  ASM_START()
    46  	.sdata
    47  	.align 16
    48  ifdef(`HAVE_DOUBLE_IEEE_LITTLE_ENDIAN',`
    49  .LC0:	data4 0x00000000, 0x80000000, 0x0000403f, 0x00000000	C 2^64
    50  .LC1:	data4 0x00000000, 0x80000000, 0x0000407f, 0x00000000	C 2^128
    51  
    52  ',`ifdef(`HAVE_DOUBLE_IEEE_BIG_ENDIAN',`
    53  .LC0:	data4 0x403f8000, 0x00000000, 0x00000000, 0x00000000	C 2^64
    54  .LC1:	data4 0x407f8000, 0x00000000, 0x00000000, 0x00000000	C 2^128
    55  
    56  ',`m4_error(`Oops, need to know float endianness
    57  ')')')
    58  
    59  
    60  PROLOGUE(mpn_invert_limb)
    61  		C 00
    62  	addl		r14 = @gprel(.LC0), gp
    63  	addl		r15 = @gprel(.LC1), gp
    64  	setf.sig	f7 = r32
    65  	add		r9 = r32, r32		C check for d = 2^63
    66  	;;	C 01
    67  	ldfe		f10 = [r14]		C 2^64
    68  	ldfe		f8 = [r15]		C 2^128
    69  	cmp.eq		p6, p0 = 0, r9		C check for d = 2^63
    70  	mov		r8 = -1			C retval for 2^63
    71     (p6)	br.ret.spnt.many b0
    72  	;;	C 07
    73  	fmpy.s1		f11 = f7, f10		C f11 = d * 2^64
    74  	fnma.s1		f6 = f7, f10, f8	C f6 = 2^128 - d * 2^64
    75  	;;	C 11
    76  	frcpa.s1	f8, p6 = f6, f7
    77  	;;	C 15
    78     (p6)	fnma.s1		f9 = f7, f8, f1
    79     (p6)	fmpy.s1		f10 = f6, f8
    80  	;;	C 19
    81     (p6)	fmpy.s1		f11 = f9, f9
    82     (p6)	fma.s1		f10 = f9, f10, f10
    83  	;;	C 23
    84     (p6)	fma.s1		f8 = f9, f8, f8
    85     (p6)	fma.s1		f9 = f11, f10, f10
    86  	;;	C 27
    87     (p6)	fma.s1		f8 = f11, f8, f8
    88     (p6)	fnma.s1		f10 = f7, f9, f6
    89  	;;	C 31
    90     (p6)	fma.s1		f8 = f10, f8, f9
    91  	;;	C 35
    92  	fcvt.fxu.trunc.s1 f8 = f8
    93  	;;	C 39
    94  	getf.sig	r8 = f8
    95  	xmpy.hu		f10 = f8, f7		C di * d
    96  	;;	C 43
    97  	getf.sig	r14 = f10
    98  	andcm		r9 = -1, r32		C one's complement
    99  	;;	C 48
   100  	cmp.ltu		p6, p0 = r9, r14	C got overflow?
   101  	;;	C 49
   102     (p6)	add		r8 = -1, r8		C adjust di down
   103  	br.ret.sptk.many b0
   104  EPILOGUE()
   105  ASM_END()