From b1e89e3948dba01baf86e3518c6bdd3efff08ce5 Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Wed, 19 Aug 2026 17:34:09 +0800
Subject: [CodeGen] Match LLVM post-machine scheduler contract

---
 backend/lib/CodeGen/PostRAScheduler.cpp | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/backend/lib/CodeGen/PostRAScheduler.cpp b/backend/lib/CodeGen/PostRAScheduler.cpp
index fede8df..d2feb92 100644
--- a/backend/lib/CodeGen/PostRAScheduler.cpp
+++ b/backend/lib/CodeGen/PostRAScheduler.cpp
@@ -32,9 +32,7 @@ namespace {
   static const MachinePassContract Contract = [] {
     MachinePassContract Value{
         .Name = "postmisched",
-        .Requires = {MachineFunctionProperty::Selected, MachineFunctionProperty::NoPHIs,
-                     MachineFunctionProperty::TiedOpsRewritten, MachineFunctionProperty::NoVRegs,
-                     MachineFunctionProperty::TracksLiveness},
+        .Requires = {},
         .Sets = {},
         .Clears = {},
         .RequiredAnalyses = {MachineFunctionAnalysisManager::id<LiveVariablesAnalysis>()},
@@ -58,10 +56,6 @@ const MachinePassContract &PostRASchedulerPass::contract() const noexcept {
 Expected<MachinePassResult> PostRASchedulerPass::run(MachineFunction &Function,
                                                      const TargetDescription &Target,
                                                      MachineFunctionAnalysisManager &Analyses) {
-  if (!Function.properties().containsAll(contract().Requires)) {
-    return makeUnexpected(ErrorCode::VerificationError,
-                          "post-RA scheduler requires allocated tracked-liveness MachineIR");
-  }
   auto Trial = cloneMachineFunction(
       Function, Target,
       MachineFunctionCloneOptions{.NewStableID = Function.stableID(), .NewName = std::nullopt});
-- 
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