[clang] [llvm] [RISCV] Added the MIPS prefetch extensions for MIPS RV64 P8700. (PR #145647)

[Craig Topper via cfe-commits]

================
@@ -2925,6 +2925,54 @@ bool RISCVDAGToDAGISel::SelectAddrRegImm(SDValue Addr, 
SDValue &Base,
   return true;
 }
 
+/// Similar to SelectAddrRegImm, except that the offset restricted for
+/// nine bits.
+bool RISCVDAGToDAGISel::SelectAddrRegImm9(SDValue Addr, SDValue &Base,
+                                          SDValue &Offset) {
+  if (SelectAddrFrameIndex(Addr, Base, Offset))
+    return true;
+
+  SDLoc DL(Addr);
+  MVT VT = Addr.getSimpleValueType();
+
+  if (CurDAG->isBaseWithConstantOffset(Addr)) {
+
+    int64_t CVal = cast<ConstantSDNode>(Addr.getOperand(1))->getSExtValue();
+    if (isUInt<9>(CVal)) {
+      Base = Addr.getOperand(0);
+
+      if (auto *FIN = dyn_cast<FrameIndexSDNode>(Base))
+        Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), VT);
+      Offset = CurDAG->getSignedTargetConstant(CVal, DL, VT);
+      return true;
+    }
+
+    // Handle with 12 bit ofset  immediates with ADDI.
----------------
topperc wrote:

ofset -> offset

https://github.com/llvm/llvm-project/pull/145647
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