[LLVMdev] RFC: Missing canonicalization in LLVM

[Chandler Carruth]

On Wed, Jan 21, 2015 at 3:02 PM, Hal Finkel <hfinkel at anl.gov> wrote:

> You still need to make sure, in many cases, that you load into the correct
> register file to avoid expensive cross-domain moves. So *something* need to
> look at the eventual users, either the IR-level optimizer or the backend.
> I'd prefer the IR-level optimizer if possible.


See my response to Pete, but in general this only applies in a case where
there is no use of the load other than a store. I already taught
instcombine to canonicalize loads which are *used* as floating point values
correctly.
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