[llvm] 7350978 - [X86] Avoid repeated hash lookups (NFC) (#126857)

[via llvm-commits]

Author: Kazu Hirata
Date: 2025-02-12T23:38:01+08:00
New Revision: 73509781b52486cdff8dc68c4c143ffa2f95356e

URL: https://github.com/llvm/llvm-project/commit/73509781b52486cdff8dc68c4c143ffa2f95356e
DIFF: https://github.com/llvm/llvm-project/commit/73509781b52486cdff8dc68c4c143ffa2f95356e.diff

LOG: [X86] Avoid repeated hash lookups (NFC) (#126857)

Added: 
    

Modified: 
    llvm/lib/Target/X86/X86DomainReassignment.cpp

Removed: 
    


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diff  --git a/llvm/lib/Target/X86/X86DomainReassignment.cpp b/llvm/lib/Target/X86/X86DomainReassignment.cpp
index a3547f802976b..25f81834bfa5e 100644
--- a/llvm/lib/Target/X86/X86DomainReassignment.cpp
+++ b/llvm/lib/Target/X86/X86DomainReassignment.cpp
@@ -451,8 +451,8 @@ bool X86DomainReassignment::visitRegister(Closure &C, Register Reg,
 }
 
 bool X86DomainReassignment::encloseInstr(Closure &C, MachineInstr *MI) {
-  auto I = EnclosedInstrs.find(MI);
-  if (I != EnclosedInstrs.end()) {
+  auto [I, Inserted] = EnclosedInstrs.try_emplace(MI, C.getID());
+  if (!Inserted) {
     if (I->second != C.getID()) {
       // Instruction already belongs to another closure, avoid conflicts between
       // closure and mark this closure as illegal.
@@ -462,7 +462,6 @@ bool X86DomainReassignment::encloseInstr(Closure &C, MachineInstr *MI) {
     return true;
   }
 
-  EnclosedInstrs[MI] = C.getID();
   C.addInstruction(MI);
 
   // Mark closure as illegal for reassignment to domains, if there is no