[Bug rtl-optimization/40838] gcc shouldn't assume that the stack is aligned

[mikulas at artax dot karlin dot mff dot cuni dot cz]

------- Comment #61 from mikulas at artax dot karlin dot mff dot cuni dot cz  2009-10-16 02:10 -------
> Why should gcc align the stack when SSE registers aren't used
> at all?

Because it passes pointer to the structure containing vector entries to someone
else who expects it to be aligned.

As for the updated patch --- why does it modify the autovectorizer? Anything
that the autovectorizer does can be done manually without the autovectorizer.
So, if there is a case where patching the autovectorizer is required to avoid a
bug, there is definitely another case, where the bug still persists if the
programmer vectorizes the code explicitly.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40838