[llvm] [AMDGPU] Avoid repeated hash lookups (NFC) (PR #127371)

[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/127371.diff


1 Files Affected:

- (modified) llvm/lib/Target/AMDGPU/AMDGPUSwLowerLDS.cpp (+3-2) 


``````````diff
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUSwLowerLDS.cpp b/llvm/lib/Target/AMDGPU/AMDGPUSwLowerLDS.cpp
index 17207773b4858..c0581e491720d 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUSwLowerLDS.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUSwLowerLDS.cpp
@@ -948,12 +948,13 @@ Constant *AMDGPUSwLowerLDS::getAddressesOfVariablesInKernel(
 
   SmallVector<Constant *> Elements;
   for (auto *GV : Variables) {
-    if (!LDSParams.LDSToReplacementIndicesMap.contains(GV)) {
+    auto It = LDSParams.LDSToReplacementIndicesMap.find(GV);
+    if (It == LDSParams.LDSToReplacementIndicesMap.end()) {
       Elements.push_back(
           PoisonValue::get(IRB.getPtrTy(AMDGPUAS::GLOBAL_ADDRESS)));
       continue;
     }
-    auto &Indices = LDSParams.LDSToReplacementIndicesMap[GV];
+    auto &Indices = It->second;
     Constant *GEPIdx[] = {ConstantInt::get(Int32Ty, Indices[0]),
                           ConstantInt::get(Int32Ty, Indices[1]),
                           ConstantInt::get(Int32Ty, Indices[2])};

``````````

</details>


https://github.com/llvm/llvm-project/pull/127371