From b91913184946e8381dc2d632ce37563913d5ce5f Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Fri, 28 Aug 2026 19:44:49 +0800
Subject: [RISCV] Complete Zcmp frame lowering and optimization

---
 backend/lib/Target/RISCV/RISCVPipeline.cpp | 24 +++++++++++-------------
 1 file changed, 11 insertions(+), 13 deletions(-)

(limited to 'backend/lib/Target/RISCV/RISCVPipeline.cpp')

diff --git a/backend/lib/Target/RISCV/RISCVPipeline.cpp b/backend/lib/Target/RISCV/RISCVPipeline.cpp
index c34a590..3e7599d 100644
--- a/backend/lib/Target/RISCV/RISCVPipeline.cpp
+++ b/backend/lib/Target/RISCV/RISCVPipeline.cpp
@@ -102,6 +102,15 @@ template <typename PassT, typename... ArgumentT>
   return addPass<VirtualRegisterRewritePass>(Pipeline);
 }
 
+[[nodiscard]] MachineFunctionPassManager::PassList
+postRAPseudoExpansionPasses(const RISCVSubtarget &Subtarget) {
+  MachineFunctionPassManager::PassList Passes;
+  Passes.push_back(createMakeCompressiblePass(Subtarget));
+  Passes.push_back(createMoveMergePass(Subtarget));
+  Passes.push_back(createPushPopOptimizationPass(Subtarget));
+  return Passes;
+}
+
 [[nodiscard]] Expected<void> addCompleteRegistry(MachineFunctionPassManager &Pipeline,
                                                  const RISCVSubtarget &Subtarget,
                                                  TargetPipelineOptions Options) {
@@ -123,13 +132,7 @@ template <typename PassT, typename... ArgumentT>
                                Options.DebugPrologueEpilogue),
       MachineOptimizationPipelineOptions{.UseTargetCopyInstructions =
                                              Options.UseTargetCopyInstructions},
-      createPushPopOptimizationPass(Subtarget));
-  if (!Added)
-    return std::unexpected(Added.error());
-  Added = Pipeline.addPass(createMakeCompressiblePass(Subtarget));
-  if (!Added)
-    return std::unexpected(Added.error());
-  Added = Pipeline.addPass(createMoveMergePass(Subtarget));
+      postRAPseudoExpansionPasses(Subtarget));
   if (!Added)
     return std::unexpected(Added.error());
   return addPass<CFIInstrInserterPass>(Pipeline, Subtarget.frameLowering());
@@ -198,15 +201,10 @@ Expected<void> addCanonicalPipeline(MachineFunctionPassManager &Pipeline,
                                  Options.DebugPrologueEpilogue),
         MachineOptimizationPipelineOptions{.UseTargetCopyInstructions =
                                                Options.UseTargetCopyInstructions},
-        createPushPopOptimizationPass(Subtarget));
+        postRAPseudoExpansionPasses(Subtarget));
     if (!Added)
       return std::unexpected(Added.error());
   }
-  auto Added = Pipeline.addPass(createMakeCompressiblePass(Subtarget));
-  if (!Added)
-    return std::unexpected(Added.error());
-  if (Subtarget.features().has(RISCVExtension::Zcmp))
-    return Pipeline.addPass(createMoveMergePass(Subtarget));
   return {};
 }
 
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