This is for an experimental option -mips-os16. The idea is to compile all

Mips32 code as Mips16 unless it can't be compiled as Mips 16. For now this
would happen as long as floating point instructions are not needed.
Probably it would also make sense to compile as mips32 if atomic operations
are needed too. There may be other cases too.

A module pass prescans the IR and adds the mips16 or nomips16 attribute
to functions depending on the functions needs.

Mips 16 mode can result in a 40% code compression by utililizing 16 bit
encoding of many instructions.

The hope is for this to replace the traditional gcc way of dealing with
Mips16 code using floating point which involves essentially using soft float
but with a library implemented using mips32 floating point. This gcc 
method also requires creating stubs so that Mips32 code can interact with
these Mips 16 functions that have floating point needs. My conjecture is
that in reality this traditional gcc method would never win over this
new method.

I will be implementing the traditional gcc method also. Some of it is already
done but I needed to do the stubs to finish the work and those required
this mips16/32 mixed mode capability.

I have more ideas for to make this new method much better and I think the old
method will just live in llvm for anyone that needs the backward compatibility
but I don't for what reason that would be needed.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179185 91177308-0d34-0410-b5e6-96231b3b80d8

6 files changed, 185 insertions, 1 deletions

diff --git a/lib/Target/Mips/CMakeLists.txt b/lib/Target/Mips/CMakeLists.txt
index a75e8bd..78a9f70 100644
--- a/lib/Target/Mips/CMakeLists.txt
+++ b/lib/Target/Mips/CMakeLists.txt
@@ -33,6 +33,7 @@ add_llvm_target(MipsCodeGen
   MipsMCInstLower.cpp
   MipsMachineFunction.cpp
   MipsModuleISelDAGToDAG.cpp
+  MipsOs16.cpp
   MipsRegisterInfo.cpp
   MipsSEFrameLowering.cpp
   MipsSEInstrInfo.cpp
diff --git a/lib/Target/Mips/MipsOs16.cpp b/lib/Target/Mips/MipsOs16.cpp
new file mode 100644
index 0000000..aabc466
--- /dev/null
+++ b/lib/Target/Mips/MipsOs16.cpp
@@ -0,0 +1,113 @@
+//===---- MipsOs16.cpp for Mips Option -Os16                         --------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines an optimization phase for the MIPS target.
+//
+//===----------------------------------------------------------------------===//
+
+#define DEBUG_TYPE "mips-os16"
+#include "MipsOs16.h"
+#include "llvm/IR/Module.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/raw_ostream.h"
+
+namespace {
+
+  // Figure out if we need float point based on the function signature.
+  // We need to move variables in and/or out of floating point
+  // registers because of the ABI
+  //
+  bool needsFPFromSig(Function &F) {
+    Type* RetType = F.getReturnType();
+    switch (RetType->getTypeID()) {
+    case Type::FloatTyID:
+    case Type::DoubleTyID:
+      return true;
+    default:
+      ;
+    }
+    if (F.arg_size() >=1) {
+      Argument &Arg = F.getArgumentList().front();
+      switch (Arg.getType()->getTypeID()) {
+        case Type::FloatTyID:
+        case Type::DoubleTyID:
+          return true;
+        default:
+          ;
+      }
+    }
+    return false;
+  }
+
+  // Figure out if the function will need floating point operations
+  //
+  bool needsFP(Function &F) {
+    if (needsFPFromSig(F))
+      return true;
+    for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
+      for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
+         I != E; ++I) {
+        const Instruction &Inst = *I;
+        switch (Inst.getOpcode()) {
+        case Instruction::FAdd:
+        case Instruction::FSub:
+        case Instruction::FMul:
+        case Instruction::FDiv:
+        case Instruction::FRem:
+        case Instruction::FPToUI:
+        case Instruction::FPToSI:
+        case Instruction::UIToFP:
+        case Instruction::SIToFP:
+        case Instruction::FPTrunc:
+        case Instruction::FPExt:
+        case Instruction::FCmp:
+          return true;
+        default:
+          ;
+        }
+        if (const CallInst *CI = dyn_cast<CallInst>(I)) {
+          DEBUG(dbgs() << "Working on call" << "\n");
+          Function &F_ =  *CI->getCalledFunction();
+          if (needsFPFromSig(F_))
+            return true;
+        }
+      }
+    return false;
+  }
+}
+namespace llvm {
+
+
+bool MipsOs16::runOnModule(Module &M) {
+  DEBUG(errs() << "Run on Module MipsOs16\n");
+  bool modified = false;
+  for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) {
+    if (F->isDeclaration()) continue;
+    DEBUG(dbgs() << "Working on " << F->getName() << "\n");
+    if (needsFP(*F)) {
+      DEBUG(dbgs() << " need to compile as nomips16 \n");
+      F->addFnAttr("nomips16");
+    }
+    else {
+      F->addFnAttr("mips16");
+      DEBUG(dbgs() << " no need to compile as nomips16 \n");
+    }
+  }
+  return modified;
+}
+
+char MipsOs16::ID = 0;
+
+}
+
+ModulePass *llvm::createMipsOs16(MipsTargetMachine &TM) {
+  return new MipsOs16;
+}
+
+
diff --git a/lib/Target/Mips/MipsOs16.h b/lib/Target/Mips/MipsOs16.h
new file mode 100644
index 0000000..21beef8
--- /dev/null
+++ b/lib/Target/Mips/MipsOs16.h
@@ -0,0 +1,49 @@
+//===---- MipsOs16.h for Mips Option -Os16                         --------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines an optimization phase for the MIPS target.
+//
+//===----------------------------------------------------------------------===//
+
+#include "MCTargetDesc/MipsMCTargetDesc.h"
+#include "MipsTargetMachine.h"
+#include "llvm/Pass.h"
+#include "llvm/Target/TargetMachine.h"
+
+
+
+#ifndef MIPSOS16_H
+#define MIPSOS16_H
+
+using namespace llvm;
+
+namespace llvm {
+
+class MipsOs16 : public ModulePass {
+
+public:
+  static char ID;
+
+  MipsOs16() : ModulePass(ID) {
+
+  }
+
+  virtual const char *getPassName() const {
+    return "MIPS Os16 Optimization";
+  }
+
+  virtual bool runOnModule(Module &M);
+
+};
+
+ModulePass *createMipsOs16(MipsTargetMachine &TM);
+
+}
+
+#endif
diff --git a/lib/Target/Mips/MipsSubtarget.cpp b/lib/Target/Mips/MipsSubtarget.cpp
index b91f547..14a2b27 100644
--- a/lib/Target/Mips/MipsSubtarget.cpp
+++ b/lib/Target/Mips/MipsSubtarget.cpp
@@ -41,6 +41,13 @@ static cl::opt<bool> Mixed16_32(
            "and Mips32 code in a single source file"),
   cl::Hidden);
 
+static cl::opt<bool> Mips_Os16(
+  "mips-os16",
+  cl::init(false),
+  cl::desc("Compile all functions that don' use "
+           "floating point as Mips 16"),
+  cl::Hidden);
+
 void MipsSubtarget::anchor() { }
 
 MipsSubtarget::MipsSubtarget(const std::string &TT, const std::string &CPU,
@@ -52,7 +59,7 @@ MipsSubtarget::MipsSubtarget(const std::string &TT, const std::string &CPU,
   IsLinux(true), HasSEInReg(false), HasCondMov(false), HasSwap(false),
   HasBitCount(false), HasFPIdx(false),
   InMips16Mode(false), InMicroMipsMode(false), HasDSP(false), HasDSPR2(false),
-  AllowMixed16_32(Mixed16_32),
+  AllowMixed16_32(Mixed16_32 | Mips_Os16), Os16(Mips_Os16),
   RM(_RM), OverrideMode(NoOverride), TM(_TM)
 {
   std::string CPUName = CPU;
diff --git a/lib/Target/Mips/MipsSubtarget.h b/lib/Target/Mips/MipsSubtarget.h
index 5ad627c..f2f0e15 100644
--- a/lib/Target/Mips/MipsSubtarget.h
+++ b/lib/Target/Mips/MipsSubtarget.h
@@ -105,6 +105,11 @@ protected:
   // Allow mixed Mips16 and Mips32 in one source file
   bool AllowMixed16_32;
 
+  // Optimize for space by compiling all functions as Mips 16 unless
+  // it needs floating point. Functions needing floating point are
+  // compiled as Mips32
+  bool Os16;
+
   InstrItineraryData InstrItins;
 
   // The instance to the register info section object
@@ -185,6 +190,8 @@ public:
 
   bool allowMixed16_32() const { return AllowMixed16_32;};
 
+  bool os16() const { return Os16;};
+
   // Grab MipsRegInfo object
   const MipsReginfo &getMReginfo() const { return MRI; }
 
diff --git a/lib/Target/Mips/MipsTargetMachine.cpp b/lib/Target/Mips/MipsTargetMachine.cpp
index 18c1cce..ee28e2a 100644
--- a/lib/Target/Mips/MipsTargetMachine.cpp
+++ b/lib/Target/Mips/MipsTargetMachine.cpp
@@ -16,6 +16,7 @@
 #include "MipsFrameLowering.h"
 #include "MipsInstrInfo.h"
 #include "MipsModuleISelDAGToDAG.h"
+#include "MipsOs16.h"
 #include "MipsSEFrameLowering.h"
 #include "MipsSEInstrInfo.h"
 #include "MipsSEISelLowering.h"
@@ -141,6 +142,7 @@ public:
     return *getMipsTargetMachine().getSubtargetImpl();
   }
 
+  virtual void addIRPasses();
   virtual bool addInstSelector();
   virtual bool addPreEmitPass();
 };
@@ -150,6 +152,11 @@ TargetPassConfig *MipsTargetMachine::createPassConfig(PassManagerBase &PM) {
   return new MipsPassConfig(this, PM);
 }
 
+void MipsPassConfig::addIRPasses() {
+  TargetPassConfig::addIRPasses();
+  if (getMipsSubtarget().os16())
+    addPass(createMipsOs16(getMipsTargetMachine()));
+}
 // Install an instruction selector pass using
 // the ISelDag to gen Mips code.
 bool MipsPassConfig::addInstSelector() {