complex.c: removed redundant conditions

Fixnums can be compared by object values themselves only.
Addition/subtraction/mulplication of fixnum 0 do not affect the
sign.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62701 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

complex.c

@@ -70,12 +70,10 @@ f_##n(VALUE x, VALUE y)\
 inline static VALUE
 f_add(VALUE x, VALUE y)
 {
-#ifndef PRESERVE_SIGNEDZERO
-    if (FIXNUM_P(y) && FIXNUM_ZERO_P(y))
+    if (FIXNUM_ZERO_P(y))
 	return x;
-    else if (FIXNUM_P(x) && FIXNUM_ZERO_P(x))
+    if (FIXNUM_ZERO_P(x))
 	return y;
-#endif
     return rb_funcall(x, '+', 1, y);
 }
 
@@ -107,36 +105,20 @@ f_gt_p(VALUE x, VALUE y)
 inline static VALUE
 f_mul(VALUE x, VALUE y)
 {
-#ifndef PRESERVE_SIGNEDZERO
-    if (FIXNUM_P(y)) {
-	long iy = FIX2LONG(y);
-	if (iy == 0) {
-	    if (RB_INTEGER_TYPE_P(x))
-		return ZERO;
-	}
-	else if (iy == 1)
-	    return x;
-    }
-    else if (FIXNUM_P(x)) {
-	long ix = FIX2LONG(x);
-	if (ix == 0) {
-	    if (RB_INTEGER_TYPE_P(y))
-		return ZERO;
-	}
-	else if (ix == 1)
-	    return y;
-    }
-#endif
+    if (FIXNUM_ZERO_P(y) && RB_INTEGER_TYPE_P(x))
+	return ZERO;
+    if (FIXNUM_ZERO_P(x) && RB_INTEGER_TYPE_P(y))
+	return ZERO;
+    if (y == ONE) return x;
+    if (x == ONE) return y;
     return rb_funcall(x, '*', 1, y);
 }
 
 inline static VALUE
 f_sub(VALUE x, VALUE y)
 {
-#ifndef PRESERVE_SIGNEDZERO
-    if (FIXNUM_P(y) && FIXNUM_ZERO_P(y))
+    if (FIXNUM_ZERO_P(y))
 	return x;
-#endif
     return rb_funcall(x, '-', 1, y);
 }