[llvm-branch-commits] [llvm] [LV] Mask off possibly aliasing vector lanes (PR #100579)

[Sander de Smalen via llvm-branch-commits]

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@@ -2063,6 +2080,12 @@ static bool useActiveLaneMaskForControlFlow(TailFoldingStyle Style) {
          Style == TailFoldingStyle::DataAndControlFlowWithoutRuntimeCheck;
 }
 
+static bool useSafeEltsMask(TailFoldingStyle TFStyle, RTCheckStyle Style,
+                            ElementCount VF, const TargetTransformInfo &TTI) {
+  return useActiveLaneMask(TFStyle) && Style == RTCheckStyle::UseSafeEltsMask &&
+         TTI.useSafeEltsMask(VF);
+}
+
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sdesmalen-arm wrote:

When you add a check to `TTI.useSafeEltsMask` in `CostModel::getRTCheckStyle`, then function becomes redundant and you can call the CostModel function directly to check if `CM.getRTCheckStyle() == RTCheckStyle::UseSafeEltsMask`

https://github.com/llvm/llvm-project/pull/100579