https://github.com/kazutakahirata created
https://github.com/llvm/llvm-project/pull/126464
None
>From 471b2f287c7b3b1ade9dbe5b1d9cb10affa0a6e6 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <k...@google.com>
Date: Sun, 9 Feb 2025 16:20:17 -0800
Subject: [PATCH] [TableGen] Avoid repeated hash lookups (NFC)
---
clang/utils/TableGen/MveEmitter.cpp | 15 ++++-----------
1 file changed, 4 insertions(+), 11 deletions(-)
diff --git a/clang/utils/TableGen/MveEmitter.cpp
b/clang/utils/TableGen/MveEmitter.cpp
index 014b20667e03e4c..7bee2996382c115 100644
--- a/clang/utils/TableGen/MveEmitter.cpp
+++ b/clang/utils/TableGen/MveEmitter.cpp
@@ -1629,17 +1629,10 @@ void EmitterBase::EmitBuiltinCG(raw_ostream &OS) {
for (const auto &OI : kv.second)
key.push_back(OI.ParamValues[i]);
- auto Found = ParamNumberMap.find(key);
- if (Found != ParamNumberMap.end()) {
- // Yes, an existing parameter variable can be reused for this.
- ParamNumbers.push_back(Found->second);
- continue;
- }
-
- // No, we need a new parameter variable.
- int ExistingIndex = ParamNumberMap.size();
- ParamNumberMap[key] = ExistingIndex;
- ParamNumbers.push_back(ExistingIndex);
+ // Obtain a new parameter variable if we don't have one.
+ int ParamNum =
+ ParamNumberMap.try_emplace(key, ParamNumberMap.size()).first->second;
+ ParamNumbers.push_back(ParamNum);
}
// Now we're ready to do the pass 2 code generation, which will emit the
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