[SPIR-V] Avoid repeated map lookups. NFC (llvm#125036)

topperc · web-flow · commit ae3038379fa7 · 2025-01-30T00:15:02.000-08:00
diff --git a/llvm/lib/Target/SPIRV/SPIRVModuleAnalysis.h b/llvm/lib/Target/SPIRV/SPIRVModuleAnalysis.h
@@ -180,11 +180,13 @@ struct ModuleAnalysisInfo {
     if (RI == RegisterAliasTable[MF].end()) {
       return Register(0);
     }
-    return RegisterAliasTable[MF][Reg];
+    return RI->second;
   }
   bool hasRegisterAlias(const MachineFunction *MF, Register Reg) {
-    return RegisterAliasTable.find(MF) != RegisterAliasTable.end() &&
-           RegisterAliasTable[MF].find(Reg) != RegisterAliasTable[MF].end();
+    auto RI = RegisterAliasTable.find(MF);
+    if (RI == RegisterAliasTable.end())
+      return false;
+    return RI->second.find(Reg) != RI->second.end();
   }
   unsigned getNextID() { return MaxID++; }
   bool hasMBBRegister(const MachineBasicBlock &MBB) {

Original file line number	Diff line number	Diff line change
`@@ -180,11 +180,13 @@ struct ModuleAnalysisInfo {`
`180`	`180`	`if (RI == RegisterAliasTable[MF].end()) {`
`181`	`181`	`return Register(0);`
`182`	`182`	`}`
`183`		`- return RegisterAliasTable[MF][Reg];`
	`183`	`+ return RI->second;`
`184`	`184`	`}`
`185`	`185`	`bool hasRegisterAlias(const MachineFunction *MF, Register Reg) {`
`186`		`- return RegisterAliasTable.find(MF) != RegisterAliasTable.end() &&`
`187`		`- RegisterAliasTable[MF].find(Reg) != RegisterAliasTable[MF].end();`
	`186`	`+ auto RI = RegisterAliasTable.find(MF);`
	`187`	`+ if (RI == RegisterAliasTable.end())`
	`188`	`+ return false;`
	`189`	`+ return RI->second.find(Reg) != RI->second.end();`
`188`	`190`	`}`
`189`	`191`	`unsigned getNextID() { return MaxID++; }`
`190`	`192`	`bool hasMBBRegister(const MachineBasicBlock &MBB) {`