[llvm] [AMDGPU] Avoid repeated hash lookups (NFC) (PR #110788)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-amdgpu

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/110788.diff


1 Files Affected:

- (modified) llvm/lib/Target/AMDGPU/AMDGPUIGroupLP.cpp (+3-3) 


``````````diff
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUIGroupLP.cpp b/llvm/lib/Target/AMDGPU/AMDGPUIGroupLP.cpp
index 4e913d1b32e1f1..aaad2a56de2cd0 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUIGroupLP.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUIGroupLP.cpp
@@ -2123,13 +2123,13 @@ bool MFMASmallGemmSingleWaveOpt::applyIGLPStrategy(
             continue;
           }
 
-          if (!VMEMLookup.contains(MI)) {
+          auto [It, Inserted] = VMEMLookup.try_emplace(MI, *I);
+          if (Inserted) {
             MissedAny = true;
-            VMEMLookup[MI] = *I;
             continue;
           }
 
-          Cand = VMEMLookup[MI];
+          Cand = It->second;
           if (llvm::is_contained(Counted, Cand)) {
             MissedAny = true;
             break;

``````````

</details>


https://github.com/llvm/llvm-project/pull/110788