From 79b4c897b8ea5d28af1a2455c7409fc0df803079 Mon Sep 17 00:00:00 2001
From: Dominic Chen <d.c.ddcc@gmail.com>
Date: Mon, 16 Dec 2019 19:01:26 -0500
Subject: llvm-diff: Perform structural comparison on GlobalVariables, if
 possible

Summary: Names of GlobalVariables may not be preserved depending on compilation options, so prefer a structural diff

Subscribers: llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D71582
---
 llvm/tools/llvm-diff/DifferenceEngine.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'llvm/tools/llvm-diff/DifferenceEngine.cpp')

diff --git a/llvm/tools/llvm-diff/DifferenceEngine.cpp b/llvm/tools/llvm-diff/DifferenceEngine.cpp
index bc93ece8649..564ce787059 100644
--- a/llvm/tools/llvm-diff/DifferenceEngine.cpp
+++ b/llvm/tools/llvm-diff/DifferenceEngine.cpp
@@ -732,5 +732,14 @@ void DifferenceEngine::diff(Module *L, Module *R) {
 
 bool DifferenceEngine::equivalentAsOperands(GlobalValue *L, GlobalValue *R) {
   if (globalValueOracle) return (*globalValueOracle)(L, R);
+
+  if (isa<GlobalVariable>(L) && isa<GlobalVariable>(R)) {
+    GlobalVariable *GVL = cast<GlobalVariable>(L);
+    GlobalVariable *GVR = cast<GlobalVariable>(R);
+    if (GVL->hasLocalLinkage() && GVL->hasUniqueInitializer() &&
+        GVR->hasLocalLinkage() && GVR->hasUniqueInitializer())
+      return GVL->getInitializer() == GVR->getInitializer();
+  }
+
   return L->getName() == R->getName();
 }
-- 
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