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1db8566f5e
This reverts the revert commit 408c4408facc3a79ee4ff7e9983cc972f797e176. This version of the patch includes a fix for a crash caused by treating ICmp/FCmp constant expressions as instructions. Original message: On some targets, like AArch64, vector selects can be efficiently lowered if the vector condition is a compare with a supported predicate. This patch adds a new argument to getCmpSelInstrCost, to indicate the predicate of the feeding select condition. Note that it is not sufficient to use the context instruction when querying the cost of a vector select starting from a scalar one, because the condition of the vector select could be composed of compares with different predicates. This change greatly improves modeling the costs of certain compare/select patterns on AArch64. I am also planning on putting up patches to make use of the new argument in SLPVectorizer & LV. |
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