[llvm] [LV][VPlan] Add initial support for CSA vectorization (PR #106560)

[Michael Maitland via llvm-commits]

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@@ -676,11 +768,16 @@ Value *VPInstruction::generatePerPart(VPTransformState &State, unsigned Part) {
 
 bool VPInstruction::isVectorToScalar() const {
   return getOpcode() == VPInstruction::ExtractFromEnd ||
-         getOpcode() == VPInstruction::ComputeReductionResult;
+         getOpcode() == VPInstruction::ComputeReductionResult ||
+         getOpcode() == VPInstruction::CSAAnyActive ||
+         getOpcode() == VPInstruction::CSAAnyActiveEVL;
 }
 
 bool VPInstruction::isSingleScalar() const {
-  return getOpcode() == VPInstruction::ResumePhi;
+  return getOpcode() == VPInstruction::ResumePhi ||
+         getOpcode() == VPInstruction::CSAVLPhi ||
+         getOpcode() == VPInstruction::CSAVLSel ||
+         getOpcode() == VPInstruction::ExplicitVectorLength;
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michaelmaitland wrote:

I created a separate patch for this:

https://github.com/llvm/llvm-project/pull/106818

https://github.com/llvm/llvm-project/pull/106560