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@@ -1,376 +0,0 @@
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-#!/usr/bin/perl
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-# -----------------------------------------------------------------------
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-#
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-# Copyright 2007-2008 rPath, Inc. - All Rights Reserved
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-#
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-# This file is part of the Linux kernel, and is made available under
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-# the terms of the GNU General Public License version 2 or (at your
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-# option) any later version; incorporated herein by reference.
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-#
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-# -----------------------------------------------------------------------
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-#
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-
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-#
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-# Usage: timeconst.pl HZ > timeconst.h
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-#
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-
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-# Precomputed values for systems without Math::BigInt
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-# Generated by:
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-# timeconst.pl --can 24 32 48 64 100 122 128 200 250 256 300 512 1000 1024 1200
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-%canned_values = (
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- 24 => [
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- '0xa6aaaaab','0x2aaaaaa',26,
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- 125,3,
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- '0xc49ba5e4','0x1fbe76c8b4',37,
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- 3,125,
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- '0xa2c2aaab','0xaaaa',16,
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- 125000,3,
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- '0xc9539b89','0x7fffbce4217d',47,
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- 3,125000,
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- ], 32 => [
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- '0xfa000000','0x6000000',27,
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- 125,4,
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- '0x83126e98','0xfdf3b645a',36,
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- 4,125,
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- '0xf4240000','0x0',17,
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- 31250,1,
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- '0x8637bd06','0x3fff79c842fa',46,
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- 1,31250,
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- ], 48 => [
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- '0xa6aaaaab','0x6aaaaaa',27,
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- 125,6,
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- '0xc49ba5e4','0xfdf3b645a',36,
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- 6,125,
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- '0xa2c2aaab','0x15555',17,
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- 62500,3,
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- '0xc9539b89','0x3fffbce4217d',46,
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- 3,62500,
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- ], 64 => [
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- '0xfa000000','0xe000000',28,
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- 125,8,
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- '0x83126e98','0x7ef9db22d',35,
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- 8,125,
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- '0xf4240000','0x0',18,
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- 15625,1,
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- '0x8637bd06','0x1fff79c842fa',45,
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- 1,15625,
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- ], 100 => [
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- '0xa0000000','0x0',28,
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- 10,1,
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- '0xcccccccd','0x733333333',35,
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- 1,10,
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- '0x9c400000','0x0',18,
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- 10000,1,
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- '0xd1b71759','0x1fff2e48e8a7',45,
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- 1,10000,
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- ], 122 => [
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- '0x8325c53f','0xfbcda3a',28,
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- 500,61,
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- '0xf9db22d1','0x7fbe76c8b',35,
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- 61,500,
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- '0x8012e2a0','0x3ef36',18,
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- 500000,61,
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- '0xffda4053','0x1ffffbce4217',45,
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- 61,500000,
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- ], 128 => [
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- '0xfa000000','0x1e000000',29,
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- 125,16,
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- '0x83126e98','0x3f7ced916',34,
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- 16,125,
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- '0xf4240000','0x40000',19,
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- 15625,2,
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- '0x8637bd06','0xfffbce4217d',44,
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- 2,15625,
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- ], 200 => [
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- '0xa0000000','0x0',29,
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- 5,1,
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- '0xcccccccd','0x333333333',34,
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- 1,5,
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- '0x9c400000','0x0',19,
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- 5000,1,
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- '0xd1b71759','0xfff2e48e8a7',44,
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- 1,5000,
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- ], 250 => [
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- '0x80000000','0x0',29,
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- 4,1,
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- '0x80000000','0x180000000',33,
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- 1,4,
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- '0xfa000000','0x0',20,
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- 4000,1,
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- '0x83126e98','0x7ff7ced9168',43,
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- 1,4000,
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- ], 256 => [
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- '0xfa000000','0x3e000000',30,
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- 125,32,
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- '0x83126e98','0x1fbe76c8b',33,
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- 32,125,
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- '0xf4240000','0xc0000',20,
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- 15625,4,
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- '0x8637bd06','0x7ffde7210be',43,
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- 4,15625,
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- ], 300 => [
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- '0xd5555556','0x2aaaaaaa',30,
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- 10,3,
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- '0x9999999a','0x1cccccccc',33,
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- 3,10,
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- '0xd0555556','0xaaaaa',20,
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- 10000,3,
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- '0x9d495183','0x7ffcb923a29',43,
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- 3,10000,
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- ], 512 => [
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- '0xfa000000','0x7e000000',31,
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- 125,64,
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- '0x83126e98','0xfdf3b645',32,
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- 64,125,
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- '0xf4240000','0x1c0000',21,
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- 15625,8,
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- '0x8637bd06','0x3ffef39085f',42,
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- 8,15625,
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- ], 1000 => [
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- '0x80000000','0x0',31,
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- 1,1,
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- '0x80000000','0x0',31,
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- 1,1,
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- '0xfa000000','0x0',22,
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- 1000,1,
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- '0x83126e98','0x1ff7ced9168',41,
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- 1,1000,
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- ], 1024 => [
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- '0xfa000000','0xfe000000',32,
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- 125,128,
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- '0x83126e98','0x7ef9db22',31,
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- 128,125,
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- '0xf4240000','0x3c0000',22,
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- 15625,16,
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- '0x8637bd06','0x1fff79c842f',41,
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- 16,15625,
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- ], 1200 => [
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- '0xd5555556','0xd5555555',32,
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- 5,6,
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- '0x9999999a','0x66666666',31,
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- 6,5,
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- '0xd0555556','0x2aaaaa',22,
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- 2500,3,
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- '0x9d495183','0x1ffcb923a29',41,
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- 3,2500,
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- ]
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-);
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-
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-$has_bigint = eval 'use Math::BigInt qw(bgcd); 1;';
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-
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-sub bint($)
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-{
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- my($x) = @_;
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- return Math::BigInt->new($x);
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-}
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-
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-#
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-# Constants for division by reciprocal multiplication.
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-# (bits, numerator, denominator)
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-#
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-sub fmul($$$)
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-{
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- my ($b,$n,$d) = @_;
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-
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- $n = bint($n);
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- $d = bint($d);
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-
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- return scalar (($n << $b)+$d-bint(1))/$d;
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-}
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-
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-sub fadj($$$)
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-{
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- my($b,$n,$d) = @_;
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-
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- $n = bint($n);
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- $d = bint($d);
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-
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- $d = $d/bgcd($n, $d);
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- return scalar (($d-bint(1)) << $b)/$d;
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-}
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-
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-sub fmuls($$$) {
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- my($b,$n,$d) = @_;
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- my($s,$m);
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- my($thres) = bint(1) << ($b-1);
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-
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- $n = bint($n);
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- $d = bint($d);
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-
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- for ($s = 0; 1; $s++) {
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- $m = fmul($s,$n,$d);
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- return $s if ($m >= $thres);
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- }
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- return 0;
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-}
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-
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-# Generate a hex value if the result fits in 64 bits;
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-# otherwise skip.
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-sub bignum_hex($) {
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- my($x) = @_;
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- my $s = $x->as_hex();
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-
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- return (length($s) > 18) ? undef : $s;
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-}
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-
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-# Provides mul, adj, and shr factors for a specific
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-# (bit, time, hz) combination
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-sub muladj($$$) {
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- my($b, $t, $hz) = @_;
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- my $s = fmuls($b, $t, $hz);
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- my $m = fmul($s, $t, $hz);
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- my $a = fadj($s, $t, $hz);
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- return (bignum_hex($m), bignum_hex($a), $s);
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-}
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-
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-# Provides numerator, denominator values
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-sub numden($$) {
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- my($n, $d) = @_;
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- my $g = bgcd($n, $d);
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- return ($n/$g, $d/$g);
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-}
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-
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-# All values for a specific (time, hz) combo
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-sub conversions($$) {
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- my ($t, $hz) = @_;
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- my @val = ();
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-
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- # HZ_TO_xx
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- push(@val, muladj(32, $t, $hz));
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- push(@val, numden($t, $hz));
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-
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- # xx_TO_HZ
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- push(@val, muladj(32, $hz, $t));
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- push(@val, numden($hz, $t));
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-
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- return @val;
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-}
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-
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-sub compute_values($) {
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- my($hz) = @_;
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- my @val = ();
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- my $s, $m, $a, $g;
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-
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- if (!$has_bigint) {
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- die "$0: HZ == $hz not canned and ".
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- "Math::BigInt not available\n";
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- }
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-
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- # MSEC conversions
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- push(@val, conversions(1000, $hz));
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-
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- # USEC conversions
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- push(@val, conversions(1000000, $hz));
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-
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- return @val;
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-}
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-
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-sub outputval($$)
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-{
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- my($name, $val) = @_;
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- my $csuf;
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-
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- if (defined($val)) {
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- if ($name !~ /SHR/) {
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- $val = "U64_C($val)";
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- }
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- printf "#define %-23s %s\n", $name.$csuf, $val.$csuf;
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- }
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-}
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-
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-sub output($@)
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-{
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- my($hz, @val) = @_;
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- my $pfx, $bit, $suf, $s, $m, $a;
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-
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- print "/* Automatically generated by kernel/timeconst.pl */\n";
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- print "/* Conversion constants for HZ == $hz */\n";
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- print "\n";
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- print "#ifndef KERNEL_TIMECONST_H\n";
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- print "#define KERNEL_TIMECONST_H\n";
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- print "\n";
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-
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- print "#include <linux/param.h>\n";
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- print "#include <linux/types.h>\n";
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-
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- print "\n";
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- print "#if HZ != $hz\n";
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- print "#error \"kernel/timeconst.h has the wrong HZ value!\"\n";
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- print "#endif\n";
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- print "\n";
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-
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- foreach $pfx ('HZ_TO_MSEC','MSEC_TO_HZ',
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- 'HZ_TO_USEC','USEC_TO_HZ') {
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- foreach $bit (32) {
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- foreach $suf ('MUL', 'ADJ', 'SHR') {
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- outputval("${pfx}_$suf$bit", shift(@val));
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- }
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- }
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- foreach $suf ('NUM', 'DEN') {
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- outputval("${pfx}_$suf", shift(@val));
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- }
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- }
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-
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- print "\n";
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- print "#endif /* KERNEL_TIMECONST_H */\n";
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-}
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-
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-# Pretty-print Perl values
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-sub perlvals(@) {
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- my $v;
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- my @l = ();
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-
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- foreach $v (@_) {
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- if (!defined($v)) {
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- push(@l, 'undef');
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- } elsif ($v =~ /^0x/) {
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- push(@l, "\'".$v."\'");
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- } else {
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- push(@l, $v.'');
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- }
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- }
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- return join(',', @l);
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-}
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-
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-($hz) = @ARGV;
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-
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-# Use this to generate the %canned_values structure
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-if ($hz eq '--can') {
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- shift(@ARGV);
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- @hzlist = sort {$a <=> $b} (@ARGV);
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-
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- print "# Precomputed values for systems without Math::BigInt\n";
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- print "# Generated by:\n";
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- print "# timeconst.pl --can ", join(' ', @hzlist), "\n";
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- print "\%canned_values = (\n";
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- my $pf = "\t";
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- foreach $hz (@hzlist) {
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- my @values = compute_values($hz);
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- print "$pf$hz => [\n";
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- while (scalar(@values)) {
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- my $bit;
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- foreach $bit (32) {
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- my $m = shift(@values);
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- my $a = shift(@values);
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- my $s = shift(@values);
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- print "\t\t", perlvals($m,$a,$s), ",\n";
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- }
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- my $n = shift(@values);
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- my $d = shift(@values);
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- print "\t\t", perlvals($n,$d), ",\n";
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- }
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- print "\t]";
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- $pf = ', ';
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- }
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- print "\n);\n";
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-} else {
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- $hz += 0; # Force to number
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- if ($hz < 1) {
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- die "Usage: $0 HZ\n";
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- }
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-
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- $cv = $canned_values{$hz};
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- @val = defined($cv) ? @$cv : compute_values($hz);
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- output($hz, @val);
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-}
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-exit 0;
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