[llvm] [TableGen] Avoid repeated hash lookups (NFC) (PR #123018)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-tablegen

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/123018.diff


2 Files Affected:

- (modified) llvm/utils/TableGen/GlobalISelCombinerEmitter.cpp (+2-2) 
- (modified) llvm/utils/TableGen/GlobalISelEmitter.cpp (+2-2) 


``````````diff
diff --git a/llvm/utils/TableGen/GlobalISelCombinerEmitter.cpp b/llvm/utils/TableGen/GlobalISelCombinerEmitter.cpp
index 149ba7a1d9032d..bc300c3461100e 100644
--- a/llvm/utils/TableGen/GlobalISelCombinerEmitter.cpp
+++ b/llvm/utils/TableGen/GlobalISelCombinerEmitter.cpp
@@ -2645,8 +2645,8 @@ GICombinerEmitter::buildMatchTable(MutableArrayRef<RuleMatcher> Rules) {
   for (RuleMatcher &Rule : Rules) {
     const StringRef Opcode = Rule.getOpcode();
     assert(!Opcode.empty() && "Didn't expect an undefined opcode");
-    if (OpcodeOrder.count(Opcode) == 0)
-      OpcodeOrder[Opcode] = CurrentOrdering++;
+    if (OpcodeOrder.try_emplace(Opcode, CurrentOrdering).second)
+      ++CurrentOrdering;
   }
 
   llvm::stable_sort(InputRules, [&OpcodeOrder](const Matcher *A,
diff --git a/llvm/utils/TableGen/GlobalISelEmitter.cpp b/llvm/utils/TableGen/GlobalISelEmitter.cpp
index 3b334ea4ce152c..04ebdbb0ffc90b 100644
--- a/llvm/utils/TableGen/GlobalISelEmitter.cpp
+++ b/llvm/utils/TableGen/GlobalISelEmitter.cpp
@@ -2216,8 +2216,8 @@ GlobalISelEmitter::buildMatchTable(MutableArrayRef<RuleMatcher> Rules,
   for (RuleMatcher &Rule : Rules) {
     const StringRef Opcode = Rule.getOpcode();
     assert(!Opcode.empty() && "Didn't expect an undefined opcode");
-    if (OpcodeOrder.count(Opcode) == 0)
-      OpcodeOrder[Opcode] = CurrentOrdering++;
+    if (OpcodeOrder.try_emplace(Opcode, CurrentOrdering).second)
+      ++CurrentOrdering;
   }
 
   llvm::stable_sort(

``````````

</details>


https://github.com/llvm/llvm-project/pull/123018