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[Bug middle-end/83653] [6/7/8 Regression] GCC fails to remove a can't-happen call on ia64
- From: "matthew at wil dot cx" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 11 Jan 2018 19:26:13 +0000
- Subject: [Bug middle-end/83653] [6/7/8 Regression] GCC fails to remove a can't-happen call on ia64
- Auto-submitted: auto-generated
- References: <bug-83653-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83653
--- Comment #9 from Matthew Wilcox <matthew at wil dot cx> ---
Maybe I'm a little slow, but I don't see what the path is that sets 'nr' to 0.
It's 1UL << compound_order. Typically, compound_order is 0, although it may be
anything up to log2(number of pages in the machine). Are you saying that nr
could be 0 because DOM2 thinks compound_order() could be larger than 64, and
thus undefined?