diff options
| -rw-r--r-- | ChangeLog | 6 | ||||
| -rw-r--r-- | include/ruby/ruby.h | 10 |
2 files changed, 11 insertions, 5 deletions
@@ -1,3 +1,9 @@ +Mon Aug 27 18:19:36 2012 Koichi Sasada <ko1@atdot.net> + + * include/ruby/ruby.h (rb_float_value): optimize it. + This technique was pointed by shinichiro.hamaji + <http://shinh.skr.jp/m/?date=20120825#p02>. + Mon Aug 27 15:08:25 2012 Yuki Yugui Sonoda <yugui@google.com> * common.mk (vm_trace.o): Added a missing dependency. 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; |