[llvm] [RISCV] Enable LoopDataPrefetch pass (PR #66201)

[Wang Pengcheng via llvm-commits]

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@@ -242,6 +248,22 @@ class RISCVSubtarget : public RISCVGenSubtargetInfo {
                               &Mutations) const override;
 
   bool useAA() const override;
+
+  unsigned getCacheLineSize() const override {
+    return TuneInfo->CacheLineSize;
+  };
+  unsigned getPrefetchDistance() const override {
+    return TuneInfo->PrefetchDistance;
+  };
+  unsigned getMinPrefetchStride(unsigned NumMemAccesses,
+                                unsigned NumStridedMemAccesses,
+                                unsigned NumPrefetches,
+                                bool HasCall) const override {
+    return TuneInfo->MinPrefetchStride;
+  };
+  unsigned getMaxPrefetchIterationsAhead() const override {
+    return TuneInfo->MaxPrefetchIterationsAhead;
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wangpc-pp wrote:

Ah, that is because of bug I should have fixed in #66867. I will change it to `UINT_MAX` after #66867 is merged.

https://github.com/llvm/llvm-project/pull/66201