Bit-shifting zero should be zero; ref #3620

mruby · Apr 20, 2017 · 3567b26 · 3567b26
1 parent d2cad9a
commit 3567b26
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/numeric.c b/src/numeric.c
@@ -995,6 +995,7 @@ fix_lshift(mrb_state *mrb, mrb_value x)
     return x;
   }
   val = mrb_fixnum(x);
+  if (val == 0) return x;
   if (width < 0) {
     return rshift(val, -width);
   }
@@ -1019,6 +1020,7 @@ fix_rshift(mrb_state *mrb, mrb_value x)
     return x;
   }
   val = mrb_fixnum(x);
+  if (val == 0) return x;
   if (width < 0) {
     return lshift(mrb, val, -width);
   }