[llvm] 8b03b3b - MIPS: Avoid MCSymbol::isUnset

[Fangrui Song via llvm-commits]

Author: Fangrui Song
Date: 2025-08-03T20:03:20-07:00
New Revision: 8b03b3bd4df62af2de659434495419be2a2f4a45

URL: https://github.com/llvm/llvm-project/commit/8b03b3bd4df62af2de659434495419be2a2f4a45
DIFF: https://github.com/llvm/llvm-project/commit/8b03b3bd4df62af2de659434495419be2a2f4a45.diff

LOG: MIPS: Avoid MCSymbol::isUnset

The unset state will be merged into the undefined state,
so isUnset should be avoided.

The code used by register equating uses the inaccurate condition.
```
.set r1, $4
```

For now just use isUndefined. GNU Assembler has a warning:

```
Warning: register value used as expression
```

Added: 
    

Modified: 
    llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp

Removed: 
    


################################################################################
diff  --git a/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp b/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
index f8457dfa94535..7b2ee832ae7db 100644
--- a/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
+++ b/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
@@ -6654,7 +6654,7 @@ bool MipsAsmParser::searchSymbolAlias(OperandVector &Operands) {
           llvm_unreachable("Should never fail");
       }
     }
-  } else if (Sym->isUnset()) {
+  } else if (Sym->isUndefined()) {
     // If symbol is unset, it might be created in the `parseSetAssignment`
     // routine as an alias for a numeric register name.
     // Lookup in the aliases list.