[llvm] [AMDGPU] Avoid repeated hash lookups (NFC) (PR #126430)

[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/126430.diff


1 Files Affected:

- (modified) llvm/lib/Target/AMDGPU/AMDGPUPromoteAlloca.cpp (+1-2) 


``````````diff
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUPromoteAlloca.cpp b/llvm/lib/Target/AMDGPU/AMDGPUPromoteAlloca.cpp
index 28a27ffc136776..69ddb384e1a400 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUPromoteAlloca.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUPromoteAlloca.cpp
@@ -839,10 +839,9 @@ bool AMDGPUPromoteAllocaImpl::tryPromoteAllocaToVector(AllocaInst &Alloca) {
         return RejectUser(Inst, "mem transfer inst length is non-constant or "
                                 "not a multiple of the vector element size");
 
-      if (!TransferInfo.count(TransferInst)) {
+      if (TransferInfo.try_emplace(TransferInst).second) {
         DeferredInsts.push_back(Inst);
         WorkList.push_back(Inst);
-        TransferInfo[TransferInst] = MemTransferInfo();
       }
 
       auto getPointerIndexOfAlloca = [&](Value *Ptr) -> ConstantInt * {

``````````

</details>


https://github.com/llvm/llvm-project/pull/126430