From ca6660da01a6ec33a6f9d0be157ea301f8d7863d Mon Sep 17 00:00:00 2001
From: aklkaiyan <aklkaiyan@tencent.com>
Date: Thu, 18 Jul 2024 14:58:19 +0800
Subject: [PATCH] [llvm][CodeGen] Added missing initialization failure
 information for window scheduler

---
 llvm/lib/CodeGen/WindowScheduler.cpp        | 5 ++++-
 llvm/test/CodeGen/Hexagon/swp-ws-fail-2.mir | 1 +
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/llvm/lib/CodeGen/WindowScheduler.cpp b/llvm/lib/CodeGen/WindowScheduler.cpp
index 0777480499e55..3fe8a1aaafd12 100644
--- a/llvm/lib/CodeGen/WindowScheduler.cpp
+++ b/llvm/lib/CodeGen/WindowScheduler.cpp
@@ -232,8 +232,11 @@ bool WindowScheduler::initialize() {
       return false;
     }
     for (auto &Def : MI.all_defs())
-      if (Def.isReg() && Def.getReg().isPhysical())
+      if (Def.isReg() && Def.getReg().isPhysical()) {
+        LLVM_DEBUG(dbgs() << "Physical registers are not supported in "
+                             "window scheduling!\n");
         return false;
+      }
   }
   if (SchedInstrNum <= WindowRegionLimit) {
     LLVM_DEBUG(dbgs() << "There are too few MIs in the window region!\n");
diff --git a/llvm/test/CodeGen/Hexagon/swp-ws-fail-2.mir b/llvm/test/CodeGen/Hexagon/swp-ws-fail-2.mir
index 601b98dca8e20..be75301b016ed 100644
--- a/llvm/test/CodeGen/Hexagon/swp-ws-fail-2.mir
+++ b/llvm/test/CodeGen/Hexagon/swp-ws-fail-2.mir
@@ -3,6 +3,7 @@
 # RUN: -window-sched=force -filetype=null -verify-machineinstrs 2>&1 \
 # RUN: | FileCheck %s
 
+# CHECK: Physical registers are not supported in window scheduling!
 # CHECK: The WindowScheduler failed to initialize!
 
 ---