<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi,<div class=""><br class=""></div><div class="">Some time ago James posted a patch for vectorization of calls [1]. Though it seems to be a missing feature in the vectorizer, it wasn’t committed, so I decided to revive the discussion.</div><div class=""><br class=""></div><div class="">To begin with, I rebased the patch and split it to several semantically separated parts. The approach used here is pretty natural: TargetLibraryInfo has a mapping for a set of scalar functions to their vector counterparts, TargetTransformInfo consults with it when cost of call instruction is calculated, if the vector-version is cheaper, vectorizer emits vector-function.</div><div class=""><br class=""></div><div class="">There are several question on this patch:</div><div class="">1. Is this approach still viable in general and worth pursuing?</div><div class="">2. The cost model is changed. In theory it should become more accurate, but I haven’t measured performance impact of this change yet. Does these changes look good in general? If yes, do we need to tune some target-cost-model parameters, or those are the values that no one has been actually using yet?</div><div class="">3. What is the best way to populate the scalar to vector functions map? For now, I populate it when the target-triple contains ‘Accelerate’. If we have a lot of other cases, we might think of something different here.</div><div class=""><br class=""></div><div class="">Any feedback or ideas are appreciated!</div><div class=""><br class=""></div><div class="">Thanks,</div><div class="">Michael</div><div class=""><br class=""></div><div class="">[1]: <a href="http://thread.gmane.org/gmane.comp.compilers.llvm.cvs/169736" class="">http://thread.gmane.org/gmane.comp.compilers.llvm.cvs/169736</a></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""></div></body></html>