fixup! improve comments

Author: topperc

llvm/lib/Target/RISCV/RISCVISelLowering.cpp

@@ -16252,11 +16252,10 @@ static SDValue performVP_REVERSECombine(SDNode *N, SelectionDAG &DAG,
     return SDValue();
 
   SDValue LoadMask = VPLoad->getMask();
-  // If Mask is not all 1's, try to replace the mask if its opcode
-  // is EXPERIMENTAL_VP_REVERSE and its operand can be directly extracted.
+  // If Mask is all ones, then load is unmasked and can be reversed.
   if (!isOneOrOneSplat(LoadMask)) {
-    // Check if the mask of vp.reverse in vp.load are all 1's and
-    // the length of mask is same as evl.
+    // If the mask is not all ones, we can reverse the load if the mask was also
+    // reversed by an unmasked vp.reverse with the same EVL.
     if (LoadMask.getOpcode() != ISD::EXPERIMENTAL_VP_REVERSE ||
         !isOneOrOneSplat(LoadMask.getOperand(1)) ||
         LoadMask.getOperand(2) != VPLoad->getVectorLength())