merge revision(s) 13785:

shyouhei · shyouhei · commit 24a9bf988c89 · 2008-06-07T18:05:03.000Z
* numeric.c (fix_pow): returns infinity for 0**-1.  [ruby-dev:32084]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8_6@16919 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
diff --git a/ChangeLog b/ChangeLog
@@ -1,3 +1,7 @@
+Sun Jun  8 03:04:38 2008  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* numeric.c (fix_pow): returns infinity for 0**-1.  [ruby-dev:32084]
+
 Sun Jun  8 02:58:19 2008  James Edward Gray II  <jeg2@ruby-lang.org>
 
 	Merged 13781 from trunk.
diff --git a/numeric.c b/numeric.c
@@ -2202,6 +2202,7 @@ static VALUE
 fix_pow(x, y)
     VALUE x, y;
 {
+    static const double zero = 0.0;
     long a = FIX2LONG(x);
 
     if (FIXNUM_P(y)) {
@@ -2211,7 +2212,10 @@ fix_pow(x, y)
 	if (b == 0) return INT2FIX(1);
 	if (b == 1) return x;
 	a = FIX2LONG(x);
-	if (a == 0) return INT2FIX(0);
+	if (a == 0) {
+	    if (b > 0) return INT2FIX(0);
+	    return rb_float_new(1.0 / zero);
+	}
 	if (a == 1) return INT2FIX(1);
 	if (a == -1) {
 	    if (b % 2 == 0)
@@ -2235,7 +2239,9 @@ fix_pow(x, y)
 	x = rb_int2big(FIX2LONG(x));
 	return rb_big_pow(x, y);
       case T_FLOAT:
-	if (a == 0) return rb_float_new(0.0);
+	if (a == 0) {
+	    return rb_float_new(RFLOAT(y)->value < 0 ? (1.0 / zero) : 0.0);
+	}
 	if (a == 1) return rb_float_new(1.0);
 	return rb_float_new(pow((double)a, RFLOAT(y)->value));
       default:
diff --git a/version.h b/version.h
@@ -2,7 +2,7 @@
 #define RUBY_RELEASE_DATE "2008-06-08"
 #define RUBY_VERSION_CODE 186
 #define RUBY_RELEASE_CODE 20080608
-#define RUBY_PATCHLEVEL 138
+#define RUBY_PATCHLEVEL 139
 
 #define RUBY_VERSION_MAJOR 1
 #define RUBY_VERSION_MINOR 8
