From 27c303ff00234e5ab9379878858f7ae3d0bdc2dc Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Wed, 26 Aug 2026 23:33:07 +0800
Subject: [GlobalISel] Run machine transformations once

---
 .../lib/CodeGen/GlobalISel/InstructionSelect.cpp   | 30 +++-------------------
 1 file changed, 4 insertions(+), 26 deletions(-)

(limited to 'backend/lib/CodeGen/GlobalISel/InstructionSelect.cpp')

diff --git a/backend/lib/CodeGen/GlobalISel/InstructionSelect.cpp b/backend/lib/CodeGen/GlobalISel/InstructionSelect.cpp
index 66bbff2..6aab43d 100644
--- a/backend/lib/CodeGen/GlobalISel/InstructionSelect.cpp
+++ b/backend/lib/CodeGen/GlobalISel/InstructionSelect.cpp
@@ -6,14 +6,12 @@
 #include "rcc/CodeGen/GlobalISel/Utils.h"
 #include "rcc/CodeGen/MachineBasicBlock.h"
 #include "rcc/CodeGen/MachineFunction.h"
-#include "rcc/CodeGen/MachineFunctionCloner.h"
 #include "rcc/CodeGen/MachineInstr.h"
 #include "rcc/CodeGen/MachineRegisterInfo.h"
 #include "rcc/CodeGen/TargetDescription.h"
 
 #include <algorithm>
 #include <cstdint>
-#include <optional>
 #include <string>
 #include <unordered_set>
 #include <utility>
@@ -214,33 +212,13 @@ Expected<MachinePassResult> InstructionSelect::run(MachineFunction &Function,
   if (Info == nullptr)
     return std::unexpected(passFailure("instruction select has no target behavior interface",
                                        ErrorCode::InvalidArgument));
-  auto Trial = cloneMachineFunction(
-      Function, Target,
-      MachineFunctionCloneOptions{.NewStableID = Function.stableID(), .NewName = std::nullopt});
-  if (!Trial) {
-    return std::unexpected(
-        withErrorContext(Trial.error(), "instruction-selection transaction setup failed: "));
-  }
-  MachineActionReplay Actions(Analyses, Trial->InstructionStableIDs);
-  auto TrialResult = runImplementation(*Trial->ClonedFunction, Target, Actions);
-  if (!TrialResult)
-    return std::unexpected(TrialResult.error());
-  Actions.beginReplay();
-  auto Result = runImplementation(Function, Target, Actions);
-  if (!Result) {
-    return std::unexpected(withErrorContext(
-        Result.error(),
-        "instruction selection diverged after a successful transaction preflight: "));
-  }
-  auto Replayed = Actions.finishReplay();
-  if (!Replayed)
-    return std::unexpected(Replayed.error());
-  return Result;
+  return runImplementation(Function, Target, Analyses);
 }
 
 Expected<MachinePassResult> InstructionSelect::runImplementation(MachineFunction &Function,
                                                                  const TargetDescription &Target,
-                                                                 MachineActionReplay &Actions) {
+                                                                 MachineFunctionAnalysisManager
+                                                                     &Analyses) {
 
   MachinePassResult Result;
   std::vector<MachineInstr *> Worklist;
@@ -304,7 +282,7 @@ Expected<MachinePassResult> InstructionSelect::runImplementation(MachineFunction
       return std::unexpected(Match.error());
     std::string Rule = "select.";
     Rule.append(CurrentDescriptor->Name);
-    auto Accepted = Actions.request(Rule, Function, Instruction->stableID());
+    auto Accepted = Analyses.requestAction(Rule, Function, Instruction->stableID());
     if (!Accepted)
       return std::unexpected(Accepted.error());
     if (!*Accepted) {
-- 
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