[llvm] [RISCV] Add OPERAND_AVL to RISCVInstrInfo::verifyInstruction. (PR #170770)

[Craig Topper via llvm-commits]

https://github.com/topperc created https://github.com/llvm/llvm-project/pull/170770

None

>From 937c8d64646bdb74e91b0612780c37d4d3ce5e8e Mon Sep 17 00:00:00 2001
From: Craig Topper <craig.topper at sifive.com>
Date: Thu, 4 Dec 2025 15:09:53 -0800
Subject: [PATCH] [RISCV] Add OPERAND_AVL to RISCVInstrInfo::verifyInstruction.

---
 llvm/lib/Target/RISCV/RISCVInstrInfo.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/llvm/lib/Target/RISCV/RISCVInstrInfo.cpp b/llvm/lib/Target/RISCV/RISCVInstrInfo.cpp
index a5f680c35124b..e878558f73b2c 100644
--- a/llvm/lib/Target/RISCV/RISCVInstrInfo.cpp
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfo.cpp
@@ -3076,6 +3076,18 @@ bool RISCVInstrInfo::verifyInstruction(const MachineInstr &MI,
         ErrInfo = "Invalid immediate";
         return false;
       }
+    } else if (OpType == RISCVOp::OPERAND_AVL) {
+      if (MO.isImm()) {
+        int64_t Imm = MO.getImm();
+        // VLMAX is represented as -1.
+        if (!isUInt<5>(Imm) && Imm != -1) {
+          ErrInfo = "Invalid immediate";
+          return false;
+        }
+      } else if (!MO.isReg()) {
+        ErrInfo = "Expected a register or immediate operand.";
+        return false;
+      }
     }
   }