Apologies -- I accidentally pushed a commit that corrects handling the half
data type in the kernel library. I believe that my changes are correct, but
I wanted a peer review first. Should I revert the push, or do you want to
review the change on the master branch?
The main point of the change is:
OpenCL does not treat "half" as a full data type. Mostly, one can only
either load or store it from memory, not many other operations are
possible. Those that are possible are as_type, select, etc., that treat the
type opaquely.
We currently provided some kernel functions for the half data type. For
many of these, LLVM would fail to generate machine code from byte code. I
removed those functions that the standard does not require.
I provided work-arounds or disabled those that LLVM currently cannot
handle. Most notably there is select with half3. (select with half4 and
select with short3 work fine.)
With these changes, I can finally run "llc kernel*.bc" in lib/kernel/host
without crashing LLVM.
-erik
--
Erik Schnetter <[email protected]>
http://www.perimeterinstitute.ca/personal/eschnetter/
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