From 42a352485bebe3fe382666bfc75ed17c4fea2124 Mon Sep 17 00:00:00 2001
From: Akira Hatanaka <ahatanaka@mips.com>
Date: Thu, 27 Sep 2012 01:59:07 +0000
Subject: [PATCH] MIPS DSP: add code necessary for pseudo instruction lowering.

llvm-svn: 164747
---
 llvm/lib/Target/Mips/CMakeLists.txt     |  1 +
 llvm/lib/Target/Mips/Makefile           |  2 +-
 llvm/lib/Target/Mips/MipsAsmPrinter.cpp | 11 +++++++++++
 llvm/lib/Target/Mips/MipsAsmPrinter.h   |  8 ++++++++
 llvm/lib/Target/Mips/MipsMCInstLower.h  |  2 +-
 5 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/Target/Mips/CMakeLists.txt b/llvm/lib/Target/Mips/CMakeLists.txt
index 0f84358..7dec066 100644
--- a/llvm/lib/Target/Mips/CMakeLists.txt
+++ b/llvm/lib/Target/Mips/CMakeLists.txt
@@ -11,6 +11,7 @@ tablegen(LLVM MipsGenCallingConv.inc -gen-callingconv)
 tablegen(LLVM MipsGenSubtargetInfo.inc -gen-subtarget)
 tablegen(LLVM MipsGenEDInfo.inc -gen-enhanced-disassembly-info)
 tablegen(LLVM MipsGenAsmMatcher.inc -gen-asm-matcher)
+tablegen(LLVM MipsGenMCPseudoLowering.inc -gen-pseudo-lowering)
 add_public_tablegen_target(MipsCommonTableGen)
 
 add_llvm_target(MipsCodeGen
diff --git a/llvm/lib/Target/Mips/Makefile b/llvm/lib/Target/Mips/Makefile
index 93de517..bd8c517 100644
--- a/llvm/lib/Target/Mips/Makefile
+++ b/llvm/lib/Target/Mips/Makefile
@@ -17,7 +17,7 @@ BUILT_SOURCES = MipsGenRegisterInfo.inc MipsGenInstrInfo.inc \
                 MipsGenDAGISel.inc MipsGenCallingConv.inc \
                 MipsGenSubtargetInfo.inc MipsGenMCCodeEmitter.inc \
                 MipsGenEDInfo.inc MipsGenDisassemblerTables.inc \
-                MipsGenAsmMatcher.inc
+                MipsGenMCPseudoLowering.inc MipsGenAsmMatcher.inc
 
 DIRS = InstPrinter Disassembler AsmParser TargetInfo MCTargetDesc
 
diff --git a/llvm/lib/Target/Mips/MipsAsmPrinter.cpp b/llvm/lib/Target/Mips/MipsAsmPrinter.cpp
index e780134..6ca4162 100644
--- a/llvm/lib/Target/Mips/MipsAsmPrinter.cpp
+++ b/llvm/lib/Target/Mips/MipsAsmPrinter.cpp
@@ -50,6 +50,13 @@ bool MipsAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
   return true;
 }
 
+bool MipsAsmPrinter::lowerOperand(const MachineOperand &MO, MCOperand &MCOp) {
+  MCOp = MCInstLowering.LowerOperand(MO);
+  return MCOp.isValid();
+}
+
+#include "MipsGenMCPseudoLowering.inc"
+
 void MipsAsmPrinter::EmitInstruction(const MachineInstr *MI) {
   if (MI->isDebugValue()) {
     SmallString<128> Str;
@@ -59,6 +66,10 @@ void MipsAsmPrinter::EmitInstruction(const MachineInstr *MI) {
     return;
   }
 
+  // Do any auto-generated pseudo lowerings.
+  if (emitPseudoExpansionLowering(OutStreamer, MI))
+    return;
+
   MachineBasicBlock::const_instr_iterator I = MI;
   MachineBasicBlock::const_instr_iterator E = MI->getParent()->instr_end();
 
diff --git a/llvm/lib/Target/Mips/MipsAsmPrinter.h b/llvm/lib/Target/Mips/MipsAsmPrinter.h
index 562bf9c..94d8bfa 100644
--- a/llvm/lib/Target/Mips/MipsAsmPrinter.h
+++ b/llvm/lib/Target/Mips/MipsAsmPrinter.h
@@ -32,6 +32,14 @@ class LLVM_LIBRARY_VISIBILITY MipsAsmPrinter : public AsmPrinter {
 
   void EmitInstrWithMacroNoAT(const MachineInstr *MI);
 
+private:
+  // tblgen'erated function.
+  bool emitPseudoExpansionLowering(MCStreamer &OutStreamer,
+                                   const MachineInstr *MI);
+
+  // lowerOperand - Convert a MachineOperand into the equivalent MCOperand.
+  bool lowerOperand(const MachineOperand &MO, MCOperand &MCOp);
+
 public:
 
   const MipsSubtarget *Subtarget;
diff --git a/llvm/lib/Target/Mips/MipsMCInstLower.h b/llvm/lib/Target/Mips/MipsMCInstLower.h
index 3eab5a4..c4a6016 100644
--- a/llvm/lib/Target/Mips/MipsMCInstLower.h
+++ b/llvm/lib/Target/Mips/MipsMCInstLower.h
@@ -33,11 +33,11 @@ public:
   MipsMCInstLower(MipsAsmPrinter &asmprinter);
   void Initialize(Mangler *mang, MCContext *C);
   void Lower(const MachineInstr *MI, MCInst &OutMI) const;
+  MCOperand LowerOperand(const MachineOperand& MO, unsigned offset = 0) const;
 
 private:
   MCOperand LowerSymbolOperand(const MachineOperand &MO,
                                MachineOperandType MOTy, unsigned Offset) const;
-  MCOperand LowerOperand(const MachineOperand& MO, unsigned offset = 0) const;
 };
 }
 
-- 
2.7.4