[llvm] [VPlan] Add initial loop-invariant code motion transform. (PR #107894)
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llvm-commits at lists.llvm.org
Thu Sep 19 13:24:38 PDT 2024
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@@ -971,6 +971,40 @@ static void simplifyRecipe(VPRecipeBase &R, VPTypeAnalysis &TypeInfo) {
return R.getVPSingleValue()->replaceAllUsesWith(A);
}
+/// Move loop-invariant recipes out of the vector loop region in \p Plan.
+static void licm(VPlan &Plan) {
+ VPRegionBlock *LoopRegion = Plan.getVectorLoopRegion();
+ VPBasicBlock *Preheader =
+ cast<VPBasicBlock>(LoopRegion->getSinglePredecessor());
+
+ // Return true if-and-only-if we know how to (mechanically) both hoist a given
+ // recipe out of a loop region. Does not address legality concerns such as
+ // aliasing or speculation safety.
+ auto CanHoistRecipe = [](VPRecipeBase &R) {
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ayalz wrote:
CannotHoistRecipe than double negate? Inline?
https://github.com/llvm/llvm-project/pull/107894
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