diff options
| author | nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2014-01-12 00:21:37 +0000 |
|---|---|---|
| committer | nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2014-01-12 00:21:37 +0000 |
| commit | 5e9b7bacc3731b909ea6341d7158ef6b34e09f2d (patch) | |
| tree | 13de30bb8713467ef344ade2c58ed34afe4baa0e /include/ruby/util.h | |
| parent | 0e9cad9a8e25282be170d3e4240bd2ba6ce1a419 (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/ruby/util.h')
| -rw-r--r-- | include/ruby/util.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/ruby/util.h b/include/ruby/util.h index 5be5f2e0b4..8443af74d9 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))) |