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Hi Renato, I think that we need to improve ::isTruncateFree, ::isZextFree, etc to include all of the free conversions. Vector and Scalar. Non-free conversions are marked with setOperationAction so the generic parts of TTI should be able to give a reasonable cost estimation. The cost tables should contain cases that are not handled by TTI. So, if we have a clever DAGCombine optimization (that

Hi all, I'm looking for a place where to put the costs of vector (and scalar) cast operations for ARM, but I noticed the TargetTransform methods call the TargetLowering ones when unsure. Now, I'm not sure... Many casts on ARM are free, and I could build a list of cases where it is true, but should I put this on the lowering or the transform? My main motivation is to get the costs right

...that info. And since ARMTTI is supposed to only apply the exceptions, I didn't want to override it on that. Am I making any sense? cheers, --renato -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20130125/363135e2/attachment.html>