[llvm] [X86, SimplifyCFG] Support hoisting load/store with conditional faulting (Part II) (PR #108812)

[Phoebe Wang via llvm-commits]

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@@ -7833,6 +7856,35 @@ bool SimplifyCFGOpt::simplifyCondBranch(BranchInst *BI, IRBuilder<> &Builder) {
       if (HoistCommon &&
           hoistCommonCodeFromSuccessors(BI, !Options.HoistCommonInsts))
         return requestResimplify();
+
+      if (BI && HoistLoadsStoresWithCondFaulting &&
+          Options.HoistLoadsStoresWithCondFaulting &&
+          isProfitableToSpeculate(BI, std::nullopt, TTI)) {
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phoebewang wrote:

Yeah, we need a meaningful ratio here, but we haven't enabled PGO. So let's leave it when we do PGO tuning.

https://github.com/llvm/llvm-project/pull/108812