[llvm] [VPlan] Only use selectVectorizationFactor for cross-check (NFCI). (PR #103033)

[via llvm-commits]

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@@ -10018,11 +10012,8 @@ bool LoopVectorizePass::processLoop(Loop *L) {
       InnerLoopUnroller Unroller(L, PSE, LI, DT, TLI, TTI, AC, ORE, IC, &LVL,
                                  &CM, BFI, PSI, Checks);
 
-      ElementCount BestVF = LVP.getBestVF();
-      assert(BestVF.isScalar() &&
-             "VPlan cost model and legacy cost model disagreed");
-      VPlan &BestPlan = LVP.getBestPlanFor(BestVF);
-      LVP.executePlan(BestVF, IC, BestPlan, Unroller, DT, false);
+      VPlan &BestPlan = LVP.getBestPlanFor(VF.Width);
+      LVP.executePlan(VF.Width, IC, BestPlan, Unroller, DT, false);
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ayalz wrote:

(Perhaps a cast of VectorizationFactor to ElementCount, returning its first field, could simplify using the former wherever the latter is required, although seems better to make sure the latter only is expected, by passing .Width explicitly.)

https://github.com/llvm/llvm-project/pull/103033