[TableGen] Avoid repeated hash lookups (NFC)

[kazutakahirata]

No description provided.

[llvmbot]

@llvm/pr-subscribers-tablegen

Author: Kazu Hirata (kazutakahirata)

Changes

---

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

1 Files Affected:

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

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));
     }