ruby/ruby-2.0-r36832-rb_float_value-optimization.patch

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2012-09-03 12:44:25 +00:00
From 0b89d6d5f9f8c788f4391d8a0499f10aed624371 Mon Sep 17 00:00:00 2001
From: ko1 <ko1@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 27 Aug 2012 09:22:21 +0000
Subject: [PATCH] * 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
---
ChangeLog | 6 ++++++
include/ruby/ruby.h | 10 +++++-----
2 files changed, 11 insertions(+), 5 deletions(-)
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index 3905b32..b8b2267 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -733,10 +733,7 @@ struct RFloat {
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 @@ struct RFloat {
/* 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;
--
1.7.10