[PATCH] Fix 61565 -- cmpelim vs non-call exceptions

[Richard Henderson <rth at redhat dot com>]

There aren't too many users of the cmpelim pass, and previously they were all
small embedded targets without an FPU.

I'm a bit surprised that Ramana decided to enable this pass for aarch64, as
that target is not so limited as the block comment for the pass describes.
Honestly, whatever is being deleted here ought to have been found earlier,
either via combine or cse.  We ought to find out why any changes are made
during this pass for aarch64.

That said, this PR does demonstrate a bug in the handling of fp comparisons in
the presence of -fnon-call-exceptions, so I go ahead and fix that regardless of
what we do with the aarch64 port longer term.

Bootstrap still in progress, but the original testcase is resolved.


r~

Attachment: d-61565
Description: Text document