[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,
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huntergr-arm wrote:

I think you can just pass the instruction and re-cast it here instead of passing both.

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