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dnl HP-PA __udiv_qrnnd division support, used from longlong.h.
dnl This version runs fast on PA 7000 and later.
dnl Copyright 1993, 1994, 2000, 2001, 2003 Free Software Foundation, Inc.
dnl This file is part of the GNU MP Library.
dnl
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of either:
dnl
dnl * the GNU Lesser General Public License as published by the Free
dnl Software Foundation; either version 3 of the License, or (at your
dnl option) any later version.
dnl
dnl or
dnl
dnl * the GNU General Public License as published by the Free Software
dnl Foundation; either version 2 of the License, or (at your option) any
dnl later version.
dnl
dnl or both in parallel, as here.
dnl
dnl The GNU MP Library is distributed in the hope that it will be useful, but
dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
dnl for more details.
dnl
dnl You should have received copies of the GNU General Public License and the
dnl GNU Lesser General Public License along with the GNU MP Library. If not,
dnl see https://www.gnu.org/licenses/.
include(`../config.m4')
C INPUT PARAMETERS
C rem_ptr gr26
C n1 gr25
C n0 gr24
C d gr23
C This file has caused a lot of trouble, since it demands PIC reference to
C static data, which triggers bugs in gas (at least version 2.7 through
C 2.11.2). When the bug is triggered, many bogus relocs are generated. The
C current solution is to stuff data right into the code, and refer it using
C absolute offsets. Fragile to be sure, but nothing else seems to work.
ASM_START()
ifdef(`PIC',`',
` RODATA
INT64(0000, 0x43f00000, 0x0) C 2^64
')
PROLOGUE(mpn_udiv_qrnnd)
C .callinfo frame=64,no_calls
ldo 64(%r30),%r30
stws %r25,-16(0,%r30) C n_hi
stws %r24,-12(0,%r30) C n_lo
ifdef(`PIC',
` bl .+20,%r31
dep %r0,31,2,%r31
.word 0x0 C padding for alignment
.word 0x43f00000, 0x0 C 2^64
ldo 4(%r31),%r31',
` ldil `L'%L(0000),%r31
ldo R%L(0000)(%r31),%r31')
fldds -16(0,%r30),%fr5
stws %r23,-12(0,%r30)
comib,<= 0,%r25,L(1)
fcnvxf,dbl,dbl %fr5,%fr5
fldds 0(0,%r31),%fr4
fadd,dbl %fr4,%fr5,%fr5
LDEF(1)
fcpy,sgl %fr0,%fr6L
fldws -12(0,%r30),%fr6R
fcnvxf,dbl,dbl %fr6,%fr4
fdiv,dbl %fr5,%fr4,%fr5
fcnvfx,dbl,dbl %fr5,%fr4
fstws %fr4R,-16(%r30)
xmpyu %fr4R,%fr6R,%fr6
ldws -16(%r30),%r28
fstds %fr6,-16(0,%r30)
ldws -12(0,%r30),%r21
ldws -16(0,%r30),%r20
sub %r24,%r21,%r22
subb %r25,%r20,%r20
comib,= 0,%r20,L(2)
ldo -64(%r30),%r30
add %r22,%r23,%r22
ldo -1(%r28),%r28
LDEF(2)
bv 0(%r2)
stws %r22,0(0,%r26)
EPILOGUE(mpn_udiv_qrnnd)
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