[Transforms] Avoid repeated hash lookups (NFC) (#111470)

kazutakahirata · web-flow · commit 1e5f32e81f96 · 2024-10-08T07:29:43.000-07:00
diff --git a/mlir/lib/Transforms/Utils/RegionUtils.cpp b/mlir/lib/Transforms/Utils/RegionUtils.cpp
@@ -709,8 +709,7 @@ static SmallVector<SmallVector<Value, 8>, 2> pruneRedundantArguments(
   DenseMap<Value, unsigned> firstValueToIdx;
   for (unsigned j = 0; j < numArgs; ++j) {
     Value newArg = newArguments[0][j];
-    if (!firstValueToIdx.contains(newArg))
-      firstValueToIdx[newArg] = j;
+    firstValueToIdx.try_emplace(newArg, j);
   }
 
   // Go through the first list of arguments (list 0).

Original file line number	Diff line number	Diff line change
`@@ -709,8 +709,7 @@ static SmallVector<SmallVector<Value, 8>, 2> pruneRedundantArguments(`
`709`	`709`	`DenseMap<Value, unsigned> firstValueToIdx;`
`710`	`710`	`for (unsigned j = 0; j < numArgs; ++j) {`
`711`	`711`	`Value newArg = newArguments[0][j];`
`712`		`- if (!firstValueToIdx.contains(newArg))`
`713`		`- firstValueToIdx[newArg] = j;`
	`712`	`+ firstValueToIdx.try_emplace(newArg, j);`
`714`	`713`	`}`
`715`	`714`
`716`	`715`	`// Go through the first list of arguments (list 0).`