[llvm] [AArch64][LV][SLP] Vectorizers use getFRemInstrCost for frem costs (PR #82488)

[Paul Walker via llvm-commits]

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@@ -1255,6 +1255,18 @@ class TargetTransformInfo {
       ArrayRef<const Value *> Args = ArrayRef<const Value *>(),
       const Instruction *CxtI = nullptr) const;
 
+  /// Returns the cost of a vector instruction based on the assumption that frem
+  /// will be later transformed (by ReplaceWithVecLib) into a call to a
+  /// platform specific frem vector math function.
+  /// If unsupported, it will return cost using getArithmeticInstrCost.
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paulwalker-arm wrote:

Perhaps "Returns the same cost as getArithmeticInstrCost when no math function is available." ?

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