From 8d5278769e152c549ac1e546c2a071f783f14fda Mon Sep 17 00:00:00 2001
From: Pavel Durov <pavel@p3ld3v.dev>
Date: Tue, 14 Nov 2023 14:40:26 +0000
Subject: [PATCH] Add YKFIXME comment.

---
 llvm/lib/CodeGen/TargetPassConfig.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/llvm/lib/CodeGen/TargetPassConfig.cpp b/llvm/lib/CodeGen/TargetPassConfig.cpp
index 8f606b706677a0..e813761931f2eb 100644
--- a/llvm/lib/CodeGen/TargetPassConfig.cpp
+++ b/llvm/lib/CodeGen/TargetPassConfig.cpp
@@ -1122,7 +1122,9 @@ bool TargetPassConfig::addISelPasses() {
   if (YkShadowStack) {
     addPass(createYkShadowStackPass());
   }
-
+  // YKFIXME: This is a hack. The `createLowerEmuTLSPass` pass is already added above. 
+  // We need to add it again since we want to run it on the new thread-local ShadowStack instance 
+  // which is inserted after the original TLS pass has run.
   if (TM->useEmulatedTLS()){
     addPass(createLowerEmuTLSPass());
   }