[llvm] [RISCV][LoopIdiomVectorize] Support VP intrinsics in LoopIdiomVectorize (PR #94082)

[Philip Reames via llvm-commits]

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@@ -331,6 +373,216 @@ bool LoopIdiomVectorize::recognizeByteCompare() {
   return true;
 }
 
+Value *LoopIdiomVectorize::createMaskedFindMismatch(
+    IRBuilder<> &Builder, DomTreeUpdater &DTU, GetElementPtrInst *GEPA,
+    GetElementPtrInst *GEPB, Value *ExtStart, Value *ExtEnd) {
+  Type *I64Type = Builder.getInt64Ty();
+  Type *ResType = Builder.getInt32Ty();
+  Type *LoadType = Builder.getInt8Ty();
+  Value *PtrA = GEPA->getPointerOperand();
+  Value *PtrB = GEPB->getPointerOperand();
+
+  ScalableVectorType *PredVTy =
+      ScalableVectorType::get(Builder.getInt1Ty(), ByteCompareVF);
+
+  Value *InitialPred = Builder.CreateIntrinsic(
+      Intrinsic::get_active_lane_mask, {PredVTy, I64Type}, {ExtStart, ExtEnd});
+
+  Value *VecLen = Builder.CreateIntrinsic(Intrinsic::vscale, {I64Type}, {});
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preames wrote:

See IRBuilders, CreateElementCount

https://github.com/llvm/llvm-project/pull/94082