[llvm] 0963f0d - [AMDGPU] Avoid repeated hash lookups (NFC) (#128393)

[via llvm-commits]

Author: Kazu Hirata
Date: 2025-02-22T21:03:23-08:00
New Revision: 0963f0d6459c50f3dc7e4628b3b1160fd6c2fa92

URL: https://github.com/llvm/llvm-project/commit/0963f0d6459c50f3dc7e4628b3b1160fd6c2fa92
DIFF: https://github.com/llvm/llvm-project/commit/0963f0d6459c50f3dc7e4628b3b1160fd6c2fa92.diff

LOG: [AMDGPU] Avoid repeated hash lookups (NFC) (#128393)

Added: 
    

Modified: 
    llvm/lib/Target/AMDGPU/SIFoldOperands.cpp

Removed: 
    


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diff  --git a/llvm/lib/Target/AMDGPU/SIFoldOperands.cpp b/llvm/lib/Target/AMDGPU/SIFoldOperands.cpp
index fa15e73bc31d5..641365d319a50 100644
--- a/llvm/lib/Target/AMDGPU/SIFoldOperands.cpp
+++ b/llvm/lib/Target/AMDGPU/SIFoldOperands.cpp
@@ -1084,13 +1084,11 @@ void SIFoldOperandsImpl::foldOperand(
           }
 
           if (CopyToVGPR.Reg) {
-            Register Vgpr;
-            if (VGPRCopies.count(CopyToVGPR)) {
-              Vgpr = VGPRCopies[CopyToVGPR];
-            } else {
+            auto [It, Inserted] = VGPRCopies.try_emplace(CopyToVGPR);
+            Register &Vgpr = It->second;
+            if (Inserted) {
               Vgpr = MRI->createVirtualRegister(&AMDGPU::VGPR_32RegClass);
               BuildMI(MBB, UseMI, DL, TII->get(AMDGPU::COPY), Vgpr).add(*Def);
-              VGPRCopies[CopyToVGPR] = Vgpr;
             }
             auto Tmp = MRI->createVirtualRegister(&AMDGPU::AGPR_32RegClass);
             BuildMI(MBB, UseMI, DL,