From 9388ff494a554e1f5d529be3636f9e1596fbf035 Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Sun, 16 Aug 2026 01:24:48 +0800
Subject: [RISCV][GlobalISel] Select word division pseudos

---
 backend/lib/Target/RISCV/GISel/RISCVInstructionSelector.cpp | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

(limited to 'backend/lib/Target')

diff --git a/backend/lib/Target/RISCV/GISel/RISCVInstructionSelector.cpp b/backend/lib/Target/RISCV/GISel/RISCVInstructionSelector.cpp
index 854b6a5..1d7aec2 100644
--- a/backend/lib/Target/RISCV/GISel/RISCVInstructionSelector.cpp
+++ b/backend/lib/Target/RISCV/GISel/RISCVInstructionSelector.cpp
@@ -185,7 +185,10 @@ public:
                                          const TargetDescription &Target) const override {
     if (Instruction.opcode() == instructionOpcode(InstructionOpcode::G_SLLW) ||
         Instruction.opcode() == instructionOpcode(InstructionOpcode::G_SRAW) ||
-        Instruction.opcode() == instructionOpcode(InstructionOpcode::G_SRLW)) {
+        Instruction.opcode() == instructionOpcode(InstructionOpcode::G_SRLW) ||
+        Instruction.opcode() == instructionOpcode(InstructionOpcode::G_DIVW) ||
+        Instruction.opcode() == instructionOpcode(InstructionOpcode::G_DIVUW) ||
+        Instruction.opcode() == instructionOpcode(InstructionOpcode::G_REMUW)) {
       const std::optional<LowLevelType> Type = resultType(Function, Instruction);
       const std::optional<LowLevelType> Left = operandType(Function, Instruction, 1);
       const std::optional<LowLevelType> Right = operandType(Function, Instruction, 2);
@@ -349,6 +352,12 @@ public:
       return Instruction.setOpcode(instructionOpcode(InstructionOpcode::SRAW));
     if (Instruction.opcode() == instructionOpcode(InstructionOpcode::G_SRLW))
       return Instruction.setOpcode(instructionOpcode(InstructionOpcode::SRLW));
+    if (Instruction.opcode() == instructionOpcode(InstructionOpcode::G_DIVW))
+      return Instruction.setOpcode(instructionOpcode(InstructionOpcode::DIVW));
+    if (Instruction.opcode() == instructionOpcode(InstructionOpcode::G_DIVUW))
+      return Instruction.setOpcode(instructionOpcode(InstructionOpcode::DIVUW));
+    if (Instruction.opcode() == instructionOpcode(InstructionOpcode::G_REMUW))
+      return Instruction.setOpcode(instructionOpcode(InstructionOpcode::REMUW));
     const GenericOpcode Generic = static_cast<GenericOpcode>(Instruction.opcode().value());
     const std::optional<LowLevelType> Type = resultType(Function, Instruction);
 
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