Bit-shifting zero should be zero; ref #3620

3567b262 · Yukihiro "Matz" Matsumoto · d2cad9ac · 3567b262
Commit 3567b262 authored Apr 21, 2017 by Yukihiro "Matz" Matsumoto
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src/numeric.c src/numeric.c +2 -0

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--- 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);
  }