94 lines
2.5 KiB
NASM
94 lines
2.5 KiB
NASM
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dnl HP-PA __udiv_qrnnd division support, used from longlong.h.
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dnl This version runs fast on PA 7000 and later.
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dnl Copyright 1993, 1994, 2000, 2001, 2003 Free Software Foundation, Inc.
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dnl This file is part of the GNU MP Library.
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dnl The GNU MP Library is free software; you can redistribute it and/or modify
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dnl it under the terms of the GNU Lesser General Public License as published
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dnl by the Free Software Foundation; either version 2.1 of the License, or (at
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dnl your option) any later version.
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dnl The GNU MP Library is distributed in the hope that it will be useful, but
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dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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dnl License for more details.
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dnl You should have received a copy of the GNU Lesser General Public License
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dnl along with the GNU MP Library; see the file COPYING.LIB. If not, write
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dnl to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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dnl Boston, MA 02110-1301, USA.
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include(`../config.m4')
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C INPUT PARAMETERS
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C rem_ptr gr26
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C n1 gr25
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C n0 gr24
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C d gr23
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C This file has caused a lot of trouble, since it demands PIC reference to
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C static data, which triggers bugs in gas (at least version 2.7 through
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C 2.11.2). When the bug is triggered, many bogus relocs are generated. The
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C current solution is to stuff data right into the code, and refer it using
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C absolute offsets. Fragile to be sure, but nothing else seems to work.
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ASM_START()
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ifdef(`PIC',`',
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` RODATA
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INT64(0000, 0x43f00000, 0x0) C 2^64
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')
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PROLOGUE(mpn_udiv_qrnnd)
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C .callinfo frame=64,no_calls
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ldo 64(%r30),%r30
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stws %r25,-16(0,%r30) C n_hi
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stws %r24,-12(0,%r30) C n_lo
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ifdef(`PIC',
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` bl .+20,%r31
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dep %r0,31,2,%r31
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.word 0x0 C padding for alignment
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.word 0x43f00000, 0x0 C 2^64
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ldo 4(%r31),%r31',
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` ldil `L'%L(0000),%r31
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ldo R%L(0000)(%r31),%r31')
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fldds -16(0,%r30),%fr5
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stws %r23,-12(0,%r30)
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comib,<= 0,%r25,L(1)
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fcnvxf,dbl,dbl %fr5,%fr5
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fldds 0(0,%r31),%fr4
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fadd,dbl %fr4,%fr5,%fr5
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LDEF(1)
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fcpy,sgl %fr0,%fr6L
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fldws -12(0,%r30),%fr6R
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fcnvxf,dbl,dbl %fr6,%fr4
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fdiv,dbl %fr5,%fr4,%fr5
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fcnvfx,dbl,dbl %fr5,%fr4
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fstws %fr4R,-16(%r30)
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xmpyu %fr4R,%fr6R,%fr6
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ldws -16(%r30),%r28
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fstds %fr6,-16(0,%r30)
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ldws -12(0,%r30),%r21
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ldws -16(0,%r30),%r20
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sub %r24,%r21,%r22
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subb %r25,%r20,%r20
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comib,= 0,%r20,L(2)
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ldo -64(%r30),%r30
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add %r22,%r23,%r22
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ldo -1(%r28),%r28
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LDEF(2)
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bv 0(%r2)
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stws %r22,0(0,%r26)
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EPILOGUE(mpn_udiv_qrnnd)
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