diff options
| author | ko1 <ko1@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2012-08-27 09:22:21 +0000 |
|---|---|---|
| committer | ko1 <ko1@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2012-08-27 09:22:21 +0000 |
| commit | 0b89d6d5f9f8c788f4391d8a0499f10aed624371 (patch) | |
| tree | ab30675f6625f740f88f3d7580b59c21872ead5a /include | |
| parent | 10d85333ac9e7a19c537a6000c614fdb67380426 (diff) | |
* include/ruby/ruby.h (rb_float_value): optimize it.
This technique was pointed by shinichiro.hamaji
<http://shinh.skr.jp/m/?date=20120825#p02>.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36832 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'include')
| -rw-r--r-- | include/ruby/ruby.h | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h index 3905b3294a..b8b2267006 100644 --- a/include/ruby/ruby.h +++ b/include/ruby/ruby.h @@ -733,10 +733,7 @@ static inline double rb_float_value(VALUE v) { if (FLONUM_P(v)) { - if (v == (VALUE)0x8000000000000002) { - return 0.0; - } - else { + if (v != (VALUE)0x8000000000000002) { /* LIKELY */ union { double d; VALUE v; @@ -746,9 +743,12 @@ rb_float_value(VALUE v) /* e: xx1... -> 011... */ /* xx0... -> 100... */ /* ^b63 */ - t.v = RUBY_BIT_ROTR(((b63 ^ 1) << 1) | b63 | (v & ~0x03), 3); + t.v = RUBY_BIT_ROTR(2 - b63 | (v & ~0x03), 3); return t.d; } + else { + return 0.0; + } } else { return ((struct RFloat *)v)->float_value; |