[llvm] [TableGen] Avoid repeated hash lookups (NFC) (PR #123161)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-globalisel

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/123161.diff


1 Files Affected:

- (modified) llvm/utils/TableGen/Common/GlobalISel/GlobalISelMatchTable.cpp (+2-5) 


``````````diff
diff --git a/llvm/utils/TableGen/Common/GlobalISel/GlobalISelMatchTable.cpp b/llvm/utils/TableGen/Common/GlobalISel/GlobalISelMatchTable.cpp
index a81f2b53f2846e..d56623ed60b36d 100644
--- a/llvm/utils/TableGen/Common/GlobalISel/GlobalISelMatchTable.cpp
+++ b/llvm/utils/TableGen/Common/GlobalISel/GlobalISelMatchTable.cpp
@@ -875,10 +875,8 @@ unsigned RuleMatcher::getInsnVarID(InstructionMatcher &InsnMatcher) const {
 }
 
 void RuleMatcher::defineOperand(StringRef SymbolicName, OperandMatcher &OM) {
-  if (!DefinedOperands.contains(SymbolicName)) {
-    DefinedOperands[SymbolicName] = &OM;
+  if (DefinedOperands.try_emplace(SymbolicName, &OM).second)
     return;
-  }
 
   // If the operand is already defined, then we must ensure both references in
   // the matcher have the exact same node.
@@ -889,8 +887,7 @@ void RuleMatcher::defineOperand(StringRef SymbolicName, OperandMatcher &OM) {
 }
 
 void RuleMatcher::definePhysRegOperand(const Record *Reg, OperandMatcher &OM) {
-  if (!PhysRegOperands.contains(Reg))
-    PhysRegOperands[Reg] = &OM;
+  PhysRegOperands.try_emplace(Reg, &OM);
 }
 
 InstructionMatcher &

``````````

</details>


https://github.com/llvm/llvm-project/pull/123161