[llvm] [X86] Avoid repeated hash lookups (NFC) (PR #131963)

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/131963

None

>From 05f334aead24fa9ba7d228486ce36ee97048f100 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Tue, 18 Mar 2025 12:30:42 -0700
Subject: [PATCH] [X86] Avoid repeated hash lookups (NFC)

---
 llvm/lib/Target/X86/X86DiscriminateMemOps.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/Target/X86/X86DiscriminateMemOps.cpp b/llvm/lib/Target/X86/X86DiscriminateMemOps.cpp
index 6c7e6bf041995..bd151a450394a 100644
--- a/llvm/lib/Target/X86/X86DiscriminateMemOps.cpp
+++ b/llvm/lib/Target/X86/X86DiscriminateMemOps.cpp
@@ -113,8 +113,8 @@ bool X86DiscriminateMemOps::runOnMachineFunction(MachineFunction &MF) {
       if (BypassPrefetchInstructions && IsPrefetchOpcode(MI.getDesc().Opcode))
         continue;
       Location Loc = diToLocation(DI);
-      MemOpDiscriminators[Loc] =
-          std::max(MemOpDiscriminators[Loc], DI->getBaseDiscriminator());
+      unsigned &Disc = MemOpDiscriminators[Loc];
+      Disc = std::max(Disc, DI->getBaseDiscriminator());
     }
   }