github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/mpn/pa32/hppa1_1/udiv.asm (about)

     1  dnl  HP-PA  __udiv_qrnnd division support, used from longlong.h.
     2  dnl  This version runs fast on PA 7000 and later.
     3  
     4  dnl  Copyright 1993, 1994, 2000, 2001, 2003 Free Software Foundation, Inc.
     5  
     6  dnl  This file is part of the GNU MP Library.
     7  dnl
     8  dnl  The GNU MP Library is free software; you can redistribute it and/or modify
     9  dnl  it under the terms of either:
    10  dnl
    11  dnl    * the GNU Lesser General Public License as published by the Free
    12  dnl      Software Foundation; either version 3 of the License, or (at your
    13  dnl      option) any later version.
    14  dnl
    15  dnl  or
    16  dnl
    17  dnl    * the GNU General Public License as published by the Free Software
    18  dnl      Foundation; either version 2 of the License, or (at your option) any
    19  dnl      later version.
    20  dnl
    21  dnl  or both in parallel, as here.
    22  dnl
    23  dnl  The GNU MP Library is distributed in the hope that it will be useful, but
    24  dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    25  dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    26  dnl  for more details.
    27  dnl
    28  dnl  You should have received copies of the GNU General Public License and the
    29  dnl  GNU Lesser General Public License along with the GNU MP Library.  If not,
    30  dnl  see https://www.gnu.org/licenses/.
    31  
    32  include(`../config.m4')
    33  
    34  C INPUT PARAMETERS
    35  C rem_ptr	gr26
    36  C n1		gr25
    37  C n0		gr24
    38  C d		gr23
    39  
    40  C This file has caused a lot of trouble, since it demands PIC reference to
    41  C static data, which triggers bugs in gas (at least version 2.7 through
    42  C 2.11.2).  When the bug is triggered, many bogus relocs are generated.  The
    43  C current solution is to stuff data right into the code, and refer it using
    44  C absolute offsets.  Fragile to be sure, but nothing else seems to work.
    45  
    46  ASM_START()
    47  ifdef(`PIC',`',
    48  `	RODATA
    49  	INT64(0000, 0x43f00000, 0x0)	C 2^64
    50  ')
    51  
    52  PROLOGUE(mpn_udiv_qrnnd)
    53  C	.callinfo	frame=64,no_calls
    54  
    55  	ldo		64(%r30),%r30
    56  
    57  	stws		%r25,-16(0,%r30)	C n_hi
    58  	stws		%r24,-12(0,%r30)	C n_lo
    59  
    60  ifdef(`PIC',
    61  `	bl		.+20,%r31
    62  	dep		%r0,31,2,%r31
    63  	.word	0x0				C padding for alignment
    64  	.word	0x43f00000, 0x0			C 2^64
    65  	ldo		4(%r31),%r31',
    66  `	ldil		`L'%L(0000),%r31
    67  	ldo		R%L(0000)(%r31),%r31')
    68  
    69  	fldds		-16(0,%r30),%fr5
    70  	stws		%r23,-12(0,%r30)
    71  	comib,<=	0,%r25,L(1)
    72  	fcnvxf,dbl,dbl	%fr5,%fr5
    73  	fldds		0(0,%r31),%fr4
    74  	fadd,dbl	%fr4,%fr5,%fr5
    75  
    76  LDEF(1)
    77  	fcpy,sgl	%fr0,%fr6L
    78  	fldws		-12(0,%r30),%fr6R
    79  	fcnvxf,dbl,dbl	%fr6,%fr4
    80  
    81  	fdiv,dbl	%fr5,%fr4,%fr5
    82  
    83  	fcnvfx,dbl,dbl	%fr5,%fr4
    84  	fstws		%fr4R,-16(%r30)
    85  	xmpyu		%fr4R,%fr6R,%fr6
    86  	ldws		-16(%r30),%r28
    87  	fstds		%fr6,-16(0,%r30)
    88  	ldws		-12(0,%r30),%r21
    89  	ldws		-16(0,%r30),%r20
    90  	sub		%r24,%r21,%r22
    91  	subb		%r25,%r20,%r20
    92  	comib,=		0,%r20,L(2)
    93  	ldo		-64(%r30),%r30
    94  
    95  	add		%r22,%r23,%r22
    96  	ldo		-1(%r28),%r28
    97  
    98  LDEF(2)
    99  	bv		0(%r2)
   100  	stws		%r22,0(0,%r26)
   101  
   102  EPILOGUE(mpn_udiv_qrnnd)