http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48052
Paolo Carlini <paolo.carlini at oracle dot com> changed:
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--- Comment #5 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-03-10
11:22:26 UTC ---
Vincenzo, if I understand correctly, maybe Sebastian can also tell us more, the
issue seems that, at some stage, the logic is fully general only assuming the
widest unsigned type (*), doesn't cope with smaller types. Thus, if my theory
is correct, unsigned char, unsigned short, etc, all should cause problems. On
the other hand, on x86_64, unsigned long, unsigned long long, size_t, are all
the same size, and all work (**)
(*) I don't consider int128, I don't think is relevant for loop optimization.
(**) On x86, however, unsigned int (aka unsigned long) appears to work, hum.
