[llvm] [SystemZ] Silence compiler warning (PR #113894)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-systemz

Author: Jonas Paulsson (JonPsson1)

<details>
<summary>Changes</summary>

Use SystemZ::NoRegister instead of 0 in SystemZTargetLowering::getRegisterByName().


---
Full diff: https://github.com/llvm/llvm-project/pull/113894.diff


1 Files Affected:

- (modified) llvm/lib/Target/SystemZ/SystemZISelLowering.cpp (+5-3) 


``````````diff
diff --git a/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp b/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
index 3e05f3b0180a78..1fa2dbfb26fc25 100644
--- a/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
@@ -1400,9 +1400,11 @@ SystemZTargetLowering::getRegisterByName(const char *RegName, LLT VT,
                                          const MachineFunction &MF) const {
   Register Reg =
       StringSwitch<Register>(RegName)
-          .Case("r4", Subtarget.isTargetXPLINK64() ? SystemZ::R4D : 0)
-          .Case("r15", Subtarget.isTargetELF() ? SystemZ::R15D : 0)
-          .Default(0);
+          .Case("r4", Subtarget.isTargetXPLINK64() ? SystemZ::R4D
+                                                   : SystemZ::NoRegister)
+          .Case("r15",
+                Subtarget.isTargetELF() ? SystemZ::R15D : SystemZ::NoRegister)
+          .Default(SystemZ::NoRegister);
 
   if (Reg)
     return Reg;

``````````

</details>


https://github.com/llvm/llvm-project/pull/113894