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

kazutakahirata · web-flow · commit 364e60b6e41d · 2025-03-19T07:15:21.000-07:00
diff --git 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());
     }
   }
 

Original file line number	Diff line number	Diff line change
`@@ -113,8 +113,8 @@ bool X86DiscriminateMemOps::runOnMachineFunction(MachineFunction &MF) {`
`113`	`113`	`if (BypassPrefetchInstructions && IsPrefetchOpcode(MI.getDesc().Opcode))`
`114`	`114`	`continue;`
`115`	`115`	`Location Loc = diToLocation(DI);`
`116`		`- MemOpDiscriminators[Loc] =`
`117`		`- std::max(MemOpDiscriminators[Loc], DI->getBaseDiscriminator());`
	`116`	`+ unsigned &Disc = MemOpDiscriminators[Loc];`
	`117`	`+ Disc = std::max(Disc, DI->getBaseDiscriminator());`
`118`	`118`	`}`
`119`	`119`	`}`
`120`	`120`