From dcf2aad3a588f75e21bc22c269d652e5b8255672 Mon Sep 17 00:00:00 2001
From: akr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sun, 30 Aug 2009 04:01:42 +0000
Subject: [PATCH] * time.c (add): shortcut implemented for fixnums.   (sub):
 ditto.   (mul): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@24710 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ChangeLog |  6 ++++++
 time.c    | 36 +++++++++++++++++++++++++++---------
 2 files changed, 33 insertions(+), 9 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 1c364af085..c5014e983a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Sun Aug 30 13:00:11 2009  Tanaka Akira  <akr@fsij.org>
+
+	* time.c (add): shortcut implemented for fixnums.
+	  (sub): ditto.
+	  (mul): ditto.
+
 Sun Aug 30 10:24:43 2009  Tanaka Akira  <akr@fsij.org>
 
 	* time.c (eq): apply RTEST.
diff --git a/time.c b/time.c
index bc2e769491..8a680c9f15 100644
--- a/time.c
+++ b/time.c
@@ -116,28 +116,46 @@ static ID id_eq, id_ne, id_quo, id_div, id_cmp, id_lshift;
 static VALUE
 add(VALUE x, VALUE y)
 {
-    switch (TYPE(x)) {
-      case T_BIGNUM: return rb_big_plus(x, y);
-      default: return rb_funcall(x, '+', 1, y);
+    if (FIXNUM_P(x) && FIXNUM_P(y)) {
+        long l = FIX2LONG(x) + FIX2LONG(y);
+        if (FIXABLE(l)) return LONG2FIX(l);
+        return LONG2NUM(l);
     }
+    if (TYPE(x) == T_BIGNUM) return rb_big_plus(x, y);
+    return rb_funcall(x, '+', 1, y);
 }
 
 static VALUE
 sub(VALUE x, VALUE y)
 {
-    switch (TYPE(x)) {
-      case T_BIGNUM: return rb_big_minus(x, y);
-      default: return rb_funcall(x, '-', 1, y);
+    if (FIXNUM_P(x) && FIXNUM_P(y)) {
+        long l = FIX2LONG(x) - FIX2LONG(y);
+        if (FIXABLE(l)) return LONG2FIX(l);
+        return LONG2NUM(l);
     }
+    if (TYPE(x) == T_BIGNUM) return rb_big_minus(x, y);
+    return rb_funcall(x, '-', 1, y);
 }
 
 static VALUE
 mul(VALUE x, VALUE y)
 {
-    switch (TYPE(x)) {
-      case T_BIGNUM: return rb_big_mul(x, y);
-      default: return rb_funcall(x, '*', 1, y);
+    if (FIXNUM_P(x) && FIXNUM_P(y)) {
+#if HAVE_LONG_LONG && SIZEOF_LONG * 2 <= SIZEOF_LONG_LONG 
+        LONG_LONG ll = (LONG_LONG)FIX2LONG(x) * FIX2LONG(y);
+        if (FIXABLE(ll)) return LONG2FIX(ll);
+        return LL2NUM(ll);
+#else
+        long a, b, c;
+        a = FIX2LONG(x);
+        if (a == 0) return x;
+        b = FIX2LONG(y);
+        c = a * b;
+        if (c / a == b && FIXABLE(c)) return LONG2FIX(c);
+#endif
     }
+    if (TYPE(x) == T_BIGNUM) return rb_big_mul(x, y);
+    return rb_funcall(x, '*', 1, y);
 }
 
 #define div(x,y) (rb_funcall((x), id_div, 1, (y)))