From 73ff142aa16a29c18d09564f0b7e41940fcf786c Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Wed, 26 Aug 2026 00:34:09 +0800
Subject: [RISCV] Optimize W instructions

---
 backend/lib/Target/RISCV/RISCVPipeline.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

(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 1e18661..adcf22c 100644
--- a/backend/lib/Target/RISCV/RISCVPipeline.cpp
+++ b/backend/lib/Target/RISCV/RISCVPipeline.cpp
@@ -66,6 +66,9 @@ template <typename PassT, typename... ArgumentT>
   auto Added = addSelectedSSAOptimizationPipeline(
       Pipeline, optimizationPipelineInfo(Subtarget, Options.DebugMachineScheduler,
                                          Options.DebugPrologueEpilogue));
+  if (!Added)
+    return std::unexpected(Added.error());
+  Added = Pipeline.addPass(createOptWInstrsPass(Subtarget));
   if (!Added)
     return std::unexpected(Added.error());
   Added = addPass<PHIEliminationPass>(Pipeline, instrInfo());
@@ -155,6 +158,9 @@ Expected<void> addCanonicalPipeline(MachineFunctionPassManager &Pipeline,
     auto Added = addSelectedSSAOptimizationPipeline(
         Pipeline, optimizationPipelineInfo(Subtarget, Options.DebugMachineScheduler,
                                            Options.DebugPrologueEpilogue));
+    if (!Added)
+      return std::unexpected(Added.error());
+    Added = Pipeline.addPass(createOptWInstrsPass(Subtarget));
     if (!Added)
       return std::unexpected(Added.error());
     if (!Function.properties().has(MachineFunctionProperty::NoPHIs)) {
-- 
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