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* include/ruby/ruby.h (rb_float_value): optimize it.

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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
This commit is contained in:
ko1 2012-08-27 09:22:21 +00:00
parent 10d85333ac
commit 0b89d6d5f9
2 changed files with 11 additions and 5 deletions
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6
ChangeLog
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@ -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.

10
include/ruby/ruby.h
View file

@ -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;