[llvm] [SPIRV] Avoid repeated hash lookups (NFC) (PR #130391)

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/130391

None

>From f6ae7285586bae32aca66f2b5208a3cd27b60c63 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Fri, 7 Mar 2025 01:04:35 -0800
Subject: [PATCH] [SPIRV] Avoid repeated hash lookups (NFC)

---
 llvm/lib/Target/SPIRV/SPIRVPreLegalizer.cpp | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/llvm/lib/Target/SPIRV/SPIRVPreLegalizer.cpp b/llvm/lib/Target/SPIRV/SPIRVPreLegalizer.cpp
index baacd58b28028..3779a4b6ccd34 100644
--- a/llvm/lib/Target/SPIRV/SPIRVPreLegalizer.cpp
+++ b/llvm/lib/Target/SPIRV/SPIRVPreLegalizer.cpp
@@ -120,8 +120,9 @@ addConstantsToTrack(MachineFunction &MF, SPIRVGlobalRegistry *GR,
   }
   for (MachineInstr *MI : ToErase) {
     Register Reg = MI->getOperand(2).getReg();
-    if (RegsAlreadyAddedToDT.contains(MI))
-      Reg = RegsAlreadyAddedToDT[MI];
+    auto It = RegsAlreadyAddedToDT.find(MI);
+    if (It != RegsAlreadyAddedToDT.end())
+      Reg = It->second;
     auto *RC = MRI.getRegClassOrNull(MI->getOperand(0).getReg());
     if (!MRI.getRegClassOrNull(Reg) && RC)
       MRI.setRegClass(Reg, RC);
@@ -652,7 +653,7 @@ generateAssignInstrs(MachineFunction &MF, SPIRVGlobalRegistry *GR,
   }
   for (MachineInstr *MI : ToErase) {
     auto It = RegsAlreadyAddedToDT.find(MI);
-    if (RegsAlreadyAddedToDT.contains(MI))
+    if (It != RegsAlreadyAddedToDT.end())
       MRI.replaceRegWith(MI->getOperand(0).getReg(), It->second);
     MI->eraseFromParent();
   }