[PassInstrumentation] Use try_emplace() (NFC)

nikic · AlexisPerry · commit ff12cfd89b0d · 2024-06-27T14:47:07.000-06:00
To avoid a duplicate hash map lookup.
diff --git a/llvm/lib/IR/PassInstrumentation.cpp b/llvm/lib/IR/PassInstrumentation.cpp
@@ -19,8 +19,7 @@ namespace llvm {
 
 void PassInstrumentationCallbacks::addClassToPassName(StringRef ClassName,
                                                       StringRef PassName) {
-  if (ClassToPassName[ClassName].empty())
-    ClassToPassName[ClassName] = PassName.str();
+  ClassToPassName.try_emplace(ClassName, PassName.str());
 }
 
 StringRef

Original file line number	Diff line number	Diff line change
`@@ -19,8 +19,7 @@ namespace llvm {`
`19`	`19`
`20`	`20`	`void PassInstrumentationCallbacks::addClassToPassName(StringRef ClassName,`
`21`	`21`	`StringRef PassName) {`
`22`		`- if (ClassToPassName[ClassName].empty())`
`23`		`- ClassToPassName[ClassName] = PassName.str();`
	`22`	`+ ClassToPassName.try_emplace(ClassName, PassName.str());`
`24`	`23`	`}`
`25`	`24`
`26`	`25`	`StringRef`