[llvm] [SLP] Bail out on store-to-load forwarding hazards (PR #199606)

[Alexey Bataev via llvm-commits]

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@@ -874,6 +880,15 @@ unsigned TargetTransformInfo::getCacheLineSize() const {
                                                : TTIImpl->getCacheLineSize();
 }
 
+InstructionCost TargetTransformInfo::getStoreLoadForwardingConflictCost(
+    Type *VecTy, TargetCostKind CostKind) const {
+  // A negative override means "unset"; fall back to the target's value.
+  if (StoreLoadForwardingConflictCost.getNumOccurrences() > 0 &&
+      StoreLoadForwardingConflictCost >= 0)
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alexey-bataev wrote:

```suggestion
  if (StoreLoadForwardingConflictCost >= 0)
```

https://github.com/llvm/llvm-project/pull/199606