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authornobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2014-01-12 00:21:37 +0000
committernobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2014-01-12 00:21:37 +0000
commit5e9b7bacc3731b909ea6341d7158ef6b34e09f2d (patch)
tree13de30bb8713467ef344ade2c58ed34afe4baa0e /include
parent0e9cad9a8e25282be170d3e4240bd2ba6ce1a419 (diff)
ruby/util.h: DECIMAL_SIZE_OF_BITS
* include/ruby/util.h (DECIMAL_SIZE_OF_BITS): a preprocessor constant macro to approximate decimal representation size of n-bits integer. * iseq.c (register_label): use DECIMAL_SIZE_OF_BITS for better approximation. * ext/bigdecimal/bigdecimal.c (BigMath_s_log): ditto. * common.mk (iseq.o), ext/bigdecimal/depend (bigdecimal.o): add dependency to ruby/util.h for DECIMAL_SIZE_OF_BITS. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44562 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'include')
-rw-r--r--include/ruby/util.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/ruby/util.h b/include/ruby/util.h
index 5be5f2e..8443af7 100644
--- a/include/ruby/util.h
+++ b/include/ruby/util.h
@@ -47,6 +47,9 @@ extern "C" {
RUBY_SYMBOL_EXPORT_BEGIN
+#define DECIMAL_SIZE_OF_BITS(n) (((n) * 3010 + 9998) / 9999)
+/* an approximation of ceil(n * log10(2)), upto 65536 at least */
+
#define scan_oct(s,l,e) ((int)ruby_scan_oct((s),(l),(e)))
unsigned long ruby_scan_oct(const char *, size_t, size_t *);
#define scan_hex(s,l,e) ((int)ruby_scan_hex((s),(l),(e)))