[Bug tree-optimization/69908] recognizing idioms that check for a buffer of all-zeros could make *much* better code

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69908

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

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--- Comment #1 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
There is a lot of work still to do in the vectorizer. Perhaps some of your
suggestions are already in this list:
http://gcc.gnu.org/bugzilla/buglist.cgi?keywords=missed-optimization,%20&keywords_type=allwords&list_id=7719&short_desc=vectori%20SLP&cf_known_to_fail_type=allwords&cf_known_to_work_type=allwords&query_format=advanced&bug_status=UNCONFIRMED&bug_status=NEW&bug_status=ASSIGNED&bug_status=SUSPENDED&bug_status=WAITING&bug_status=REOPENED&short_desc_type=anywordssubstr&component=tree-optimization&product=gcc

Problems are more likely to be fixed if they are 1) minimally described 2)
causes are identified 3) possible solutions are proposed. 

Looking at what GCC is doing internally
(https://gcc.gnu.org/onlinedocs/gcc/Developer-Options.html) may help to
pin-point causes.