[llvm] [Analysis] Avoid repeated hash lookups (NFC) (PR #123159)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-analysis

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/123159.diff


1 Files Affected:

- (modified) llvm/lib/Analysis/InstructionPrecedenceTracking.cpp (+3-2) 


``````````diff
diff --git a/llvm/lib/Analysis/InstructionPrecedenceTracking.cpp b/llvm/lib/Analysis/InstructionPrecedenceTracking.cpp
index fba5859b74cef3..9555e2c8dd5dd7 100644
--- a/llvm/lib/Analysis/InstructionPrecedenceTracking.cpp
+++ b/llvm/lib/Analysis/InstructionPrecedenceTracking.cpp
@@ -115,8 +115,9 @@ void InstructionPrecedenceTracking::insertInstructionTo(const Instruction *Inst,
 void InstructionPrecedenceTracking::removeInstruction(const Instruction *Inst) {
   auto *BB = Inst->getParent();
   assert(BB && "must be called before instruction is actually removed");
-  if (FirstSpecialInsts.count(BB) && FirstSpecialInsts[BB] == Inst)
-    FirstSpecialInsts.erase(BB);
+  auto It = FirstSpecialInsts.find(BB);
+  if (It != FirstSpecialInsts.end() && It->second == Inst)
+    FirstSpecialInsts.erase(It);
 }
 
 void InstructionPrecedenceTracking::removeUsersOf(const Instruction *Inst) {

``````````

</details>


https://github.com/llvm/llvm-project/pull/123159