[llvm] [ThinLTO]Sort imported GUIDs before cache key update (PR #92622)

[Mingming Liu via llvm-commits]

https://github.com/minglotus-6 created https://github.com/llvm/llvm-project/pull/92622

None

>From 7dc6aec75f1498c56f2893dc7d1feb2965029dca Mon Sep 17 00:00:00 2001
From: mingmingl <mingmingl at google.com>
Date: Fri, 17 May 2024 16:59:43 -0700
Subject: [PATCH] [ThinLTO]Sort imported GUIDs before cache key update

---
 llvm/lib/LTO/LTO.cpp | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/llvm/lib/LTO/LTO.cpp b/llvm/lib/LTO/LTO.cpp
index 53060df7f503e..afc687a02d965 100644
--- a/llvm/lib/LTO/LTO.cpp
+++ b/llvm/lib/LTO/LTO.cpp
@@ -199,13 +199,21 @@ void llvm::computeLTOCacheKey(
              [](const ImportModule &Lhs, const ImportModule &Rhs) -> bool {
                return Lhs.getHash() < Rhs.getHash();
              });
+  std::vector<uint64_t> ImportedGUIDs;
   for (const ImportModule &Entry : ImportModulesVector) {
     auto ModHash = Entry.getHash();
     Hasher.update(ArrayRef<uint8_t>((uint8_t *)&ModHash[0], sizeof(ModHash)));
 
     AddUint64(Entry.getFunctions().size());
+
+    ImportedGUIDs.clear();
     for (auto &Fn : Entry.getFunctions())
-      AddUint64(Fn);
+      ImportedGUIDs.push_back(Fn);
+
+    llvm::sort(ImportedGUIDs);
+
+    for (auto &GUID : ImportedGUIDs)
+      AddUint64(GUID);
   }
 
   // Include the hash for the resolved ODR.