[llvm] [X86,SimplifyCFG] Support conditional faulting load or store only (PR #132032)

[Phoebe Wang via llvm-commits]

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@@ -132,6 +132,11 @@ static cl::opt<unsigned> HoistLoadsStoresWithCondFaultingThreshold(
              "to speculatively execute to eliminate conditional branch "
              "(default = 6)"));
 
+static cl::opt<unsigned> DisableCloadCstore(
+    "disable-cload-cstore", cl::Hidden, cl::init(0),
+    cl::desc("Control to disable cond-faulting-load(1)/cond-faulting-store(2)"
+             "/all(3)"));
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phoebewang wrote:

The problem is not about the TTI, it's the design that doesn't work with single ConditionalLoad. X86 return true for both and others return false, but we need a case ConditionalLoad is true and ConditionalStore is false.

https://github.com/llvm/llvm-project/pull/132032