[llvm-branch-commits] [llvm] [AArch64] SLP can vectorize frem (PR #82488)

[Paul Walker via llvm-branch-commits]

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@@ -410,6 +410,14 @@ bool maskIsAllOneOrUndef(Value *Mask);
 /// for each lane which may be active.
 APInt possiblyDemandedEltsInMask(Value *Mask);
 
+/// Returns the cost of a call when a target has a vector library function for
+/// the given \p VecTy, otherwise an invalid cost.
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paulwalker-arm wrote:

I think this misses a crucial point as to why it exists.  Perhaps something like:

"Returns the cost of a vector instruction based on the assumption that it'll be later transformed (by ReplaceWithVecLib) into a call to a platform specific vector math function.  Instructions unsupported by ReplaceWithVecLib will return InstructionCost::getInvalid()."

https://github.com/llvm/llvm-project/pull/82488