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Re: Fix twolf -funroll-loops -O3 miscompilation (a semi-latent web.c bug)

> And more band-aid, ...

The gcc_assert triggers at bootstrap when compiling gcc/ada/ali.adb:

+===========================GNAT BUG DETECTED==============================+
| 4.8.0 20121127 (experimental) [trunk revision 193848p10] (x86_64-apple-darwin10.8.0) GCC error:|
| in df_remove_dead_eq_notes, at df-problems.c:2917                        |
| Error detected around ../../work/gcc/ada/ali.adb:2682:8                  |
| Please submit a bug report; see http://gcc.gnu.org/bugs.html.            |
| Use a subject line meaningful to you and us to track the bug.            |
| Include the entire contents of this bug box in the report.               |
| Include the exact gcc or gnatmake command that you entered.              |
| Also include sources listed below in gnatchop format                     |
| (concatenated together with no headers between files).                   |
+==========================================================================+

Dominique
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