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authoryugui <yugui@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2008-08-25 15:13:14 +0000
committeryugui <yugui@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2008-08-25 15:13:14 +0000
commitd0233291bc8a5068e52c69c210e5979e5324b5bc (patch)
tree7d9459449c33792c63eeb7baa071e76352e0baab /trunk/benchmark/bm_so_nsieve_bits.rb
parent0dc342de848a642ecce8db697b8fecd83a63e117 (diff)
parent72eaacaa15256ab95c3b52ea386f88586fb9da40 (diff)
re-adding tag v1_9_0_4 as an alias of trunk@18848v1_9_0_4
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/tags/v1_9_0_4@18849 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'trunk/benchmark/bm_so_nsieve_bits.rb')
-rw-r--r--trunk/benchmark/bm_so_nsieve_bits.rb42
1 files changed, 0 insertions, 42 deletions
diff --git a/trunk/benchmark/bm_so_nsieve_bits.rb b/trunk/benchmark/bm_so_nsieve_bits.rb
deleted file mode 100644
index 019b8b6382..0000000000
--- a/trunk/benchmark/bm_so_nsieve_bits.rb
+++ /dev/null
@@ -1,42 +0,0 @@
-#!/usr/bin/ruby
-#
-# The Great Computer Language Shootout
-# http://shootout.alioth.debian.org/
-#
-# nsieve-bits in Ruby
-# Contributed by Glenn Parker, March 2005
-
-CharExponent = 3
-BitsPerChar = 1 << CharExponent
-LowMask = BitsPerChar - 1
-
-def sieve(m)
- items = "\xFF" * ((m / BitsPerChar) + 1)
- masks = ""
- BitsPerChar.times do |b|
- masks << (1 << b).chr
- end
-
- count = 0
- pmax = m - 1
- 2.step(pmax, 1) do |p|
- if items[p >> CharExponent][p & LowMask] == 1
- count += 1
- p.step(pmax, p) do |mult|
- a = mult >> CharExponent
- b = mult & LowMask
- items[a] -= masks[b] if items[a][b] != 0
- end
- end
- end
- count
-end
-
-n = 9 # (ARGV[0] || 2).to_i
-n.step(n - 2, -1) do |exponent|
- break if exponent < 0
- m = 2 ** exponent * 10_000
- count = sieve(m)
- printf "Primes up to %8d %8d\n", m, count
-end
-