[llvm] [RISCV][GISEL] Legalize G_INSERT_SUBVECTOR (PR #108859)

[Michael Maitland via llvm-commits]

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@@ -915,6 +921,154 @@ bool RISCVLegalizerInfo::legalizeSplatVector(MachineInstr &MI,
   return true;
 }
 
+static LLT getLMUL1Ty(LLT VecTy) {
+  assert(VecTy.getElementType().getSizeInBits() <= 64 &&
+         "Unexpected vector LLT");
+  return LLT::scalable_vector(RISCV::RVVBitsPerBlock /
+                                  VecTy.getElementType().getSizeInBits(),
+                              VecTy.getElementType());
+}
+
+bool RISCVLegalizerInfo::legalizeInsertSubvector(MachineInstr &MI,
+                                                 MachineIRBuilder &MIB) const {
+  assert(MI.getOpcode() == TargetOpcode::G_INSERT_SUBVECTOR);
+
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michaelmaitland wrote:

Added

https://github.com/llvm/llvm-project/pull/108859