- * This function sometimes triggers optimizer bugs in GCC 4.1.1 and
- * possibly also earlier versions, leading to an assumption that tree[1]
- * does not change during this function. We add an explicit memory barrier
- * as a work-around. Ugh.
+ * This function sometimes triggers optimizer bugs in GCC versions up to 4.2.1,
+ * leading to an assumption that tree[1] does not change during this function.
+ * We add an explicit memory barrier as a work-around. Ugh. See GCC Bug #33262.