[llvm] [TableGen] Avoid repeated hash lookups (NFC) (PR #120619)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-tablegen

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/120619.diff


1 Files Affected:

- (modified) llvm/utils/TableGen/Common/CodeGenDAGPatterns.cpp (+1-2) 


``````````diff
diff --git a/llvm/utils/TableGen/Common/CodeGenDAGPatterns.cpp b/llvm/utils/TableGen/Common/CodeGenDAGPatterns.cpp
index 193d29717d2c96..1a393beaa14f96 100644
--- a/llvm/utils/TableGen/Common/CodeGenDAGPatterns.cpp
+++ b/llvm/utils/TableGen/Common/CodeGenDAGPatterns.cpp
@@ -3290,10 +3290,9 @@ void CodeGenDAGPatterns::ParsePatternFragments(bool OutFrags) {
       if (!OpsList->getArgName(j))
         P->error("Operands list should have names for each operand!");
       StringRef ArgNameStr = OpsList->getArgNameStr(j);
-      if (!OperandsSet.count(ArgNameStr))
+      if (!OperandsSet.erase(ArgNameStr))
         P->error("'" + ArgNameStr +
                  "' does not occur in pattern or was multiply specified!");
-      OperandsSet.erase(ArgNameStr);
       Args.push_back(std::string(ArgNameStr));
     }
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/120619