47 lines
1.3 KiB
Diff
47 lines
1.3 KiB
Diff
From 0b89d6d5f9f8c788f4391d8a0499f10aed624371 Mon Sep 17 00:00:00 2001
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From: ko1 <ko1@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
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Date: Mon, 27 Aug 2012 09:22:21 +0000
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Subject: [PATCH] * include/ruby/ruby.h (rb_float_value): optimize it. This
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technique was pointed by shinichiro.hamaji
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<http://shinh.skr.jp/m/?date=20120825#p02>.
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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36832 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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---
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ChangeLog | 6 ++++++
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include/ruby/ruby.h | 10 +++++-----
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2 files changed, 11 insertions(+), 5 deletions(-)
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diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
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index 3905b32..b8b2267 100644
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--- a/include/ruby/ruby.h
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+++ b/include/ruby/ruby.h
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@@ -733,10 +733,7 @@ struct RFloat {
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rb_float_value(VALUE v)
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{
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if (FLONUM_P(v)) {
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- if (v == (VALUE)0x8000000000000002) {
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- return 0.0;
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- }
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- else {
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+ if (v != (VALUE)0x8000000000000002) { /* LIKELY */
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union {
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double d;
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VALUE v;
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@@ -746,9 +743,12 @@ struct RFloat {
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/* e: xx1... -> 011... */
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/* xx0... -> 100... */
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/* ^b63 */
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- t.v = RUBY_BIT_ROTR(((b63 ^ 1) << 1) | b63 | (v & ~0x03), 3);
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+ t.v = RUBY_BIT_ROTR(2 - b63 | (v & ~0x03), 3);
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return t.d;
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}
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+ else {
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+ return 0.0;
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+ }
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}
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else {
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return ((struct RFloat *)v)->float_value;
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--
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1.7.10
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