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dnl IA-64 mpn_invert_limb -- Invert a normalized limb.
dnl Copyright (C) 2000 Free Software Foundation, Inc.
dnl This file is part of the GNU MP Library.
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU Lesser General Public License as published
dnl by the Free Software Foundation; either version 2.1 of the License, or (at
dnl your option) any later version.
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 Lesser General Public
dnl License for more details.
dnl You should have received a copy of the GNU Lesser General Public License
dnl along with the GNU MP Library; see the file COPYING.LIB. If not, write to
dnl the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
dnl MA 02111-1307, USA.
include(`../config.m4')
C INPUT PARAMETERS
C d = r32
C It should be possible to avoid the xmpy.hu and the following tests by
C explicitly chopping in the last fma. That would save about 10 cycles.
ASM_START()
.section .rodata
.align 16
.LC0: data4 0x00000000, 0x80000000, 0x0000403f, 0x00000000 // 2^64
data4 0x00000000, 0x80000000, 0x0000407f, 0x00000000 // 2^128
PROLOGUE(mpn_invert_limb)
addl r14 = @ltoff(.LC0),gp
add r8 = r32,r32;; // check for d = 2^63
ld8 r14 = [r14]
cmp.eq p6,p7 = 0,r8;; // check for d = 2^63
ldfe f10 = [r14],16 // 2^64
setf.sig f7 = r32
mov r8 = -1
(p6) br.ret.spnt b0;;
ldfe f8 = [r14] // 2^128
fmpy.s1 f11 = f7,f10;; // scale by 2^64
fsub.s1 f6 = f8,f11;;
frcpa.s1 f8,p6 = f6,f7;;
(p6) fnma.s1 f9 = f7,f8,f1
(p6) fmpy.s1 f10 = f6,f8;;
(p6) fmpy.s1 f11 = f9,f9
(p6) fma.s1 f10 = f9,f10,f10;;
(p6) fma.s1 f8 = f9,f8,f8
(p6) fma.s1 f9 = f11,f10,f10;;
(p6) fma.s1 f8 = f11,f8,f8
(p6) fnma.s1 f10 = f7,f9,f6;;
(p6) fma.s1 f8 = f10,f8,f9;;
fcvt.fxu.trunc.s1 f8 = f8;;
xmpy.hu f10 = f8,f7;; // di * d
getf.sig r8 = f8
getf.sig r14 = f10;;
add r32 = r32,r14;;
cmp.ltu p6,p7 = r32,r14;; // got overflow?
(p6) add r8 = -1,r8 // adjust di down
br.ret.sptk b0
EPILOGUE(mpn_invert_limb)
ASM_END()
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