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

[Ramkumar Ramachandra via llvm-commits]

================
@@ -1985,6 +1985,11 @@ bool RISCVTTIImpl::isLSRCostLess(const TargetTransformInfo::LSRCost &C1,
                   C2.ScaleCost, C2.ImmCost, C2.SetupCost);
 }
 
+bool RISCVTTIImpl::enableCSAVectorization() const {
+  return ST->hasVInstructions() &&
+         ST->getProcFamily() == RISCVSubtarget::SiFive7;
----------------
artagnon wrote:

Why are we only enabling it for SiFive7?

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