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[Bug c++/42810] Enumeration with sequential values has its for-loop exit condition optimized out.
- From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 27 Jan 2010 20:43:49 -0000
- Subject: [Bug c++/42810] Enumeration with sequential values has its for-loop exit condition optimized out.
- References: <bug-42810-18694@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #17 from pinskia at gcc dot gnu dot org 2010-01-27 20:43 -------
> Your analogy is helpful, but a bit like comparing apples with oranges. The
> reason being that the compiler executes integer overflow loops identically for
> all optimization settings.
Is it? unsigned integers don't overflow by definition. They wrap. Now signed
integers overflow and change with different optimization levels. That is what
I was trying to compare with this case, not unsigned integer wrapping.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42810