93 lines
2.6 KiB
NASM
93 lines
2.6 KiB
NASM
dnl IA-64 mpn_invert_limb -- Invert a normalized limb.
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dnl Copyright 2000, 2002, 2004 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 3 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. If not, see http://www.gnu.org/licenses/.
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include(`../config.m4')
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C INPUT PARAMETERS
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C d = r32
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C cycles
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C Itanium: 74
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C Itanium 2: 50+6
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C It should be possible to avoid the xmpy.hu and the following tests by
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C explicitly chopping in the last fma. That would save about 10 cycles.
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ASM_START()
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.sdata
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.align 16
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ifdef(`HAVE_DOUBLE_IEEE_LITTLE_ENDIAN',`
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.LC0: data4 0x00000000, 0x80000000, 0x0000403f, 0x00000000 C 2^64
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.LC1: data4 0x00000000, 0x80000000, 0x0000407f, 0x00000000 C 2^128
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',`ifdef(`HAVE_DOUBLE_IEEE_BIG_ENDIAN',`
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.LC0: data4 0x403f8000, 0x00000000, 0x00000000, 0x00000000 C 2^64
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.LC1: data4 0x407f8000, 0x00000000, 0x00000000, 0x00000000 C 2^128
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',`m4_error(`Oops, need to know float endianness
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')')')
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PROLOGUE(mpn_invert_limb)
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C 00
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addl r14 = @gprel(.LC0), gp
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addl r15 = @gprel(.LC1), gp
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setf.sig f7 = r32
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add r9 = r32, r32 C check for d = 2^63
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;; C 01
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ldfe f10 = [r14] C 2^64
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ldfe f8 = [r15] C 2^128
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cmp.eq p6, p0 = 0, r9 C check for d = 2^63
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mov r8 = -1 C retval for 2^63
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(p6) br.ret.spnt.many b0
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;; C 07
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fmpy.s1 f11 = f7, f10 C f11 = d * 2^64
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fnma.s1 f6 = f7, f10, f8 C f6 = 2^128 - d * 2^64
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;; C 11
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frcpa.s1 f8, p6 = f6, f7
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;; C 15
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(p6) fnma.s1 f9 = f7, f8, f1
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(p6) fmpy.s1 f10 = f6, f8
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;; C 19
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(p6) fmpy.s1 f11 = f9, f9
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(p6) fma.s1 f10 = f9, f10, f10
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;; C 23
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(p6) fma.s1 f8 = f9, f8, f8
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(p6) fma.s1 f9 = f11, f10, f10
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;; C 27
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(p6) fma.s1 f8 = f11, f8, f8
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(p6) fnma.s1 f10 = f7, f9, f6
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;; C 31
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(p6) fma.s1 f8 = f10, f8, f9
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;; C 35
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fcvt.fxu.trunc.s1 f8 = f8
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;; C 39
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getf.sig r8 = f8
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xmpy.hu f10 = f8, f7 C di * d
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;; C 43
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getf.sig r14 = f10
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andcm r9 = -1, r32 C one's complement
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;; C 48
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cmp.ltu p6, p0 = r9, r14 C got overflow?
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;; C 49
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(p6) add r8 = -1, r8 C adjust di down
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br.ret.sptk.many b0
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EPILOGUE()
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ASM_END()
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