[llvm] [RISCV][NFC] Refine MCOperandPredicate code for rtlist. (PR #76028)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-risc-v

Author: Yeting Kuo (yetingk)

<details>
<summary>Changes</summary>

(Imm <= 15) could be implied by isUInt<4>(Imm).

---
Full diff: https://github.com/llvm/llvm-project/pull/76028.diff


1 Files Affected:

- (modified) llvm/lib/Target/RISCV/RISCVInstrInfoZc.td (+1-2) 


``````````diff
diff --git a/llvm/lib/Target/RISCV/RISCVInstrInfoZc.td b/llvm/lib/Target/RISCV/RISCVInstrInfoZc.td
index a78f3624446871..9a7249fe3e3d6c 100644
--- a/llvm/lib/Target/RISCV/RISCVInstrInfoZc.td
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfoZc.td
@@ -56,9 +56,8 @@ def rlist : Operand<OtherVT> {
     int64_t Imm;
     if (!MCOp.evaluateAsConstantImm(Imm))
       return false;
-    if (!isUInt<4>(Imm)) return false;
     // 0~3 Reserved for EABI
-    return (Imm >= 4) && (Imm <= 15);
+    return isUInt<4>(Imm) && Imm >= 4;
   }];
  }
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/76028