[llvm] [TLI] ReplaceWithVecLib pass uses CostModel (PR #78688)

[Graham Hunter via llvm-commits]

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@@ -96,15 +102,55 @@ static void replaceWithTLIFunction(Instruction &I, VFInfo &Info,
     Replacement->copyFastMathFlags(&I);
 }
 
+/// Returns whether the vector library call \p TLIFunc costs more than the
+/// original instruction \p I.
+static bool isVeclibCallSlower(const TargetLibraryInfo &TLI,
+                               const TargetTransformInfo &TTI, Instruction &I,
+                               VectorType *VectorTy, CallInst *CI,
+                               Function *TLIFunc) {
+  SmallVector<Type *, 4> OpTypes;
+  for (auto &Op : CI ? CI->args() : I.operands())
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huntergr-arm wrote:

Should only need the `I.operands()`;

https://github.com/llvm/llvm-project/pull/78688