[llvm] [BPF] Avoid repeated map lookups (NFC) (PR #129820)

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/129820

None

>From 58b8aca452b9665cfea6f6f6d5e18b7b494cc536 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Tue, 4 Mar 2025 07:35:45 -0800
Subject: [PATCH] [BPF] Avoid repeated map lookups (NFC)

---
 llvm/lib/Target/BPF/BTFDebug.cpp | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/llvm/lib/Target/BPF/BTFDebug.cpp b/llvm/lib/Target/BPF/BTFDebug.cpp
index 1a9ee3128e20d..c58b61f628881 100644
--- a/llvm/lib/Target/BPF/BTFDebug.cpp
+++ b/llvm/lib/Target/BPF/BTFDebug.cpp
@@ -1542,17 +1542,12 @@ bool BTFDebug::InstLower(const MachineInstr *MI, MCInst &OutMI) {
       const GlobalValue *GVal = MO.getGlobal();
       auto *GVar = dyn_cast<GlobalVariable>(GVal);
       if (GVar) {
-        // Emit "mov ri, <imm>"
-        int64_t Imm;
-        uint32_t Reloc;
-        if (GVar->hasAttribute(BPFCoreSharedInfo::AmaAttr) ||
-            GVar->hasAttribute(BPFCoreSharedInfo::TypeIdAttr)) {
-          Imm = PatchImms[GVar].first;
-          Reloc = PatchImms[GVar].second;
-        } else {
+        if (!GVar->hasAttribute(BPFCoreSharedInfo::AmaAttr) &&
+            !GVar->hasAttribute(BPFCoreSharedInfo::TypeIdAttr))
           return false;
-        }
 
+        // Emit "mov ri, <imm>"
+        auto [Imm, Reloc] = PatchImms[GVar];
         if (Reloc == BTF::ENUM_VALUE_EXISTENCE || Reloc == BTF::ENUM_VALUE ||
             Reloc == BTF::BTF_TYPE_ID_LOCAL || Reloc == BTF::BTF_TYPE_ID_REMOTE)
           OutMI.setOpcode(BPF::LD_imm64);