From 0dc24902b4d01b939160946098a8a3bb404b9d73 Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Wed, 19 Aug 2026 17:21:10 +0800
Subject: [CodeGen] Remove unsupported post-frame combiner

---
 backend/lib/CodeGen/MachineCombiner.cpp             | 18 ------------------
 backend/lib/CodeGen/MachineOptimizationPipeline.cpp |  4 ----
 2 files changed, 22 deletions(-)

(limited to 'backend/lib/CodeGen')

diff --git a/backend/lib/CodeGen/MachineCombiner.cpp b/backend/lib/CodeGen/MachineCombiner.cpp
index 90bedac..1075180 100644
--- a/backend/lib/CodeGen/MachineCombiner.cpp
+++ b/backend/lib/CodeGen/MachineCombiner.cpp
@@ -82,22 +82,6 @@ namespace {
                              MachinePassChange::Registers};
     return Value;
   }();
-  static const MachinePassContract PostFrame = [] {
-    MachinePassContract Value{
-        .Name = "machine-combiner-post-frame",
-        .Requires = {MachineFunctionProperty::Selected, MachineFunctionProperty::NoVRegs,
-                     MachineFunctionProperty::FrameFinalized,
-                     MachineFunctionProperty::NoFrameIndices},
-        .Sets = {},
-        .Clears = {},
-        .RequiredAnalyses = {},
-        .VerificationStage = PipelineStage::PostRAFinalized,
-    };
-    Value.ThreadSafety = PassThreadSafety::ThreadSafe;
-    Value.DeclaredChanges = {MachinePassChange::Instructions, MachinePassChange::Operands,
-                             MachinePassChange::Registers};
-    return Value;
-  }();
   switch (Stage) {
   case MachineCombinerStage::PreLegalizer:
     return PreLegalizer;
@@ -107,8 +91,6 @@ namespace {
     return PreRA;
   case MachineCombinerStage::PostRegisterAllocation:
     return PostRA;
-  case MachineCombinerStage::PostFrame:
-    return PostFrame;
   }
   return PreLegalizer;
 }
diff --git a/backend/lib/CodeGen/MachineOptimizationPipeline.cpp b/backend/lib/CodeGen/MachineOptimizationPipeline.cpp
index 4d20f9a..f3ce86d 100644
--- a/backend/lib/CodeGen/MachineOptimizationPipeline.cpp
+++ b/backend/lib/CodeGen/MachineOptimizationPipeline.cpp
@@ -103,10 +103,6 @@ addPostRegisterAllocationPipeline(MachineFunctionPassManager &Pipeline,
   if (!Added)
     return std::unexpected(Added.error());
   Added = addPass<PrologueEpilogueInsertionPass>(Pipeline, TargetInfo.FrameLowering);
-  if (!Added)
-    return std::unexpected(Added.error());
-  Added =
-      addPass<MachineCombinerPass>(Pipeline, TargetInfo.Combiner, MachineCombinerStage::PostFrame);
   if (!Added)
     return std::unexpected(Added.error());
   Added = addPass<MachineDCEPass>(Pipeline);
-- 
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