[Bug rtl-optimization/61672] Less redundant instructions deleted by pre_delete after r208113.

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61672

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

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

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
This only changes the way we represent mem_attrs.  It seems to me that
eventually mem_attr comparison doesn't work as expected?  Note sure where PRE
looks at
the stmts - LCM looks like bitmap stuff only, I only see canon_true_dependence
calls that may make a difference.

Also please specify the target you used to reproduce this.