[llvm] de06978 - [AMDGPU] Avoid repeated hash lookups (NFC) (#127445)

[via llvm-commits]

Author: Kazu Hirata
Date: 2025-02-16T23:24:15-08:00
New Revision: de06978ebcff5f75913067b019d2d522d0be0872

URL: https://github.com/llvm/llvm-project/commit/de06978ebcff5f75913067b019d2d522d0be0872
DIFF: https://github.com/llvm/llvm-project/commit/de06978ebcff5f75913067b019d2d522d0be0872.diff

LOG: [AMDGPU] Avoid repeated hash lookups (NFC) (#127445)

Added: 
    

Modified: 
    llvm/lib/Target/AMDGPU/R600OptimizeVectorRegisters.cpp

Removed: 
    


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diff  --git a/llvm/lib/Target/AMDGPU/R600OptimizeVectorRegisters.cpp b/llvm/lib/Target/AMDGPU/R600OptimizeVectorRegisters.cpp
index ac11526da0919..17f724c3173d9 100644
--- a/llvm/lib/Target/AMDGPU/R600OptimizeVectorRegisters.cpp
+++ b/llvm/lib/Target/AMDGPU/R600OptimizeVectorRegisters.cpp
@@ -270,9 +270,10 @@ bool R600VectorRegMerger::tryMergeUsingCommonSlot(RegSeqInfo &RSI,
       MOE = RSI.Instr->operands_end(); MOp != MOE; ++MOp) {
     if (!MOp->isReg())
       continue;
-    if (PreviousRegSeqByReg[MOp->getReg()].empty())
+    auto &Insts = PreviousRegSeqByReg[MOp->getReg()];
+    if (Insts.empty())
       continue;
-    for (MachineInstr *MI : PreviousRegSeqByReg[MOp->getReg()]) {
+    for (MachineInstr *MI : Insts) {
       CompatibleRSI = PreviousRegSeq[MI];
       if (RSI == CompatibleRSI)
         continue;