https://bugs.kde.org/show_bug.cgi?id=434840

--- Comment #2 from Julian Seward <jsew...@acm.org> ---
(In reply to Carl Love from comment #1)

Handing it off to the hardware via a helper function is the right
thing to do.  But you can't use a clean helper for this; that breaks
the rules for clean helpers.  A clean helper

* must produce a value which depends only on its arguments
* given the same argument, always produces the same result.

and the IR optimiser relies (or may rely) on the above being true.
You need to use a dirty helper.

Also I'm not happy about the replacement C implementations; I'm not
sure when they would ever get used.  I'd prefer if they were removed.

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