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ruby/util.h: DECIMAL_SIZE_OF_BITS

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* 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
This commit is contained in:
nobu 2014-01-12 00:21:37 +00:00
parent 0e9cad9a8e
commit 5e9b7bacc3
6 changed files with 25 additions and 4 deletions
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3
include/ruby/util.h
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@ -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)))