From 0b89d6d5f9f8c788f4391d8a0499f10aed624371 Mon Sep 17 00:00:00 2001 From: ko1 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 . 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