[llvm] [RISC-V][GISEL] Select G_BITCAST for scalable vectors (PR #101486)

[Craig Topper via llvm-commits]

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@@ -757,13 +758,21 @@ bool RISCVInstructionSelector::replacePtrWithInt(MachineOperand &Op,
                                                  MachineIRBuilder &MIB,
                                                  MachineRegisterInfo &MRI) {
   Register PtrReg = Op.getReg();
-  assert(MRI.getType(PtrReg).isPointer() && "Operand is not a pointer!");
-
+  const LLT PtrTy = MRI.getType(PtrReg);
   const LLT sXLen = LLT::scalar(STI.getXLen());
-  auto PtrToInt = MIB.buildPtrToInt(sXLen, PtrReg);
-  MRI.setRegBank(PtrToInt.getReg(0), RBI.getRegBank(RISCV::GPRBRegBankID));
-  Op.setReg(PtrToInt.getReg(0));
-  return select(*PtrToInt);
+  if (PtrTy.isPointer()) {
+    auto PtrToInt = MIB.buildPtrToInt(sXLen, PtrReg);
+    MRI.setRegBank(PtrToInt.getReg(0), RBI.getRegBank(RISCV::GPRBRegBankID));
+    Op.setReg(PtrToInt.getReg(0));
+    return select(*PtrToInt);
+  }
+  assert(PtrTy.isPointerVector() &&
+         "Operand must be a pointer of a vector of pointers");
+  assert(PtrTy.isScalableVector() &&
+         "Currently only working for scalable vector of pointers now");
+  MRI.setType(PtrReg, LLT::scalable_vector(
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topperc wrote:

If the vector and non-vector code do something wildly different they should not be in the same function.

https://github.com/llvm/llvm-project/pull/101486