[llvm] [RFC][LV] Add support for speculative loads in loops that may fault (PR #151300)

[Shih-Po Hung via llvm-commits]

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@@ -1769,15 +1770,61 @@ bool LoopVectorizationLegality::isVectorizableEarlyExitLoop() {
   assert(LatchBB->getUniquePredecessor() == SingleUncountableEdge->first &&
          "Expected latch predecessor to be the early exiting block");
 
-  // TODO: Handle loops that may fault.
   Predicates.clear();
-  if (!isDereferenceableReadOnlyLoop(TheLoop, PSE.getSE(), DT, AC,
-                                     &Predicates)) {
-    reportVectorizationFailure(
-        "Loop may fault",
-        "Cannot vectorize potentially faulting early exit loop",
-        "PotentiallyFaultingEarlyExitLoop", ORE, TheLoop);
-    return false;
+  SmallVector<LoadInst *, 4> NonDerefLoads;
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arcbbb wrote:

Updated. Thanks!

https://github.com/llvm/llvm-project/pull/151300