[llvm] [IndVars] Avoid repeated hash lookups (NFC) (PR #107513)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-transforms

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/107513.diff


1 Files Affected:

- (modified) llvm/lib/Transforms/Utils/SimplifyIndVar.cpp (+2-4) 


``````````diff
diff --git a/llvm/lib/Transforms/Utils/SimplifyIndVar.cpp b/llvm/lib/Transforms/Utils/SimplifyIndVar.cpp
index a950a4f57ef486..ff13c0653e9b96 100644
--- a/llvm/lib/Transforms/Utils/SimplifyIndVar.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyIndVar.cpp
@@ -1103,10 +1103,8 @@ class WidenIV {
 
   void updatePostIncRangeInfo(Value *Def, Instruction *UseI, ConstantRange R) {
     DefUserPair Key(Def, UseI);
-    auto It = PostIncRangeInfos.find(Key);
-    if (It == PostIncRangeInfos.end())
-      PostIncRangeInfos.insert({Key, R});
-    else
+    auto [It, Inserted] = PostIncRangeInfos.try_emplace(Key, R);
+    if (!Inserted)
       It->second = R.intersectWith(It->second);
   }
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/107513