[Bug middle-end/65855] missing optimization: triangular numbers

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65855

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |ktietz at gcc dot gnu.org,
                   |                            |rguenth at gcc dot gnu.org

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
shorten_compare in the C frontend family performs the (long unsigned int)
n_3(D) != 18446744073709551615 simplification.  Nothing in fold-const.c or
match.pd does.