implement support for the intrinsic lowering functionality

llvm-svn: 10629

lib/Target/X86/InstSelectPattern.cpp

@@ -27,8 +27,7 @@
 
 // Include the generated instruction selector...
 #include "X86GenInstrSelector.inc"
-
-namespace llvm {
+using namespace llvm;
 
 namespace {
   struct ISel : public FunctionPass, SelectionDAGTargetBuilder {
@@ -120,8 +119,7 @@ void ISel::expandCall(SelectionDAG &SD, CallInst &CI) {
 /// into a machine code representation using pattern matching and a machine
 /// description file.
 ///
-FunctionPass *createX86PatternInstructionSelector(TargetMachine &TM) {
+FunctionPass *llvm::createX86PatternInstructionSelector(TargetMachine &TM,
+                                                        IntrinsicLowering &IL) {
   return new ISel(TM);  
 }
-
-} // End llvm namespace

lib/Target/X86/InstSelectSimple.cpp

@@ -19,6 +19,7 @@
 #include "llvm/Function.h"
 #include "llvm/Instructions.h"
 #include "llvm/Intrinsics.h"
+#include "llvm/IntrinsicLowering.h"
 #include "llvm/Pass.h"
 #include "llvm/CodeGen/MachineConstantPool.h"
 #include "llvm/CodeGen/MachineFrameInfo.h"
@@ -28,8 +29,7 @@
 #include "llvm/Target/MRegisterInfo.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Support/InstVisitor.h"
-
-namespace llvm {
+using namespace llvm;
 
 /// BMI - A special BuildMI variant that takes an iterator to insert the
 /// instruction at as well as a basic block.  This is the version for when you
@@ -59,6 +59,7 @@ inline static MachineInstrBuilder BMI(MachineBasicBlock *MBB,
 namespace {
   struct ISel : public FunctionPass, InstVisitor<ISel> {
     TargetMachine &TM;
+    IntrinsicLowering &IL;
     MachineFunction *F;                 // The function we are compiling into
     MachineBasicBlock *BB;              // The current MBB we are compiling
     int VarArgsFrameIndex;              // FrameIndex for start of varargs area
@@ -68,12 +69,17 @@ namespace {
     // MBBMap - Mapping between LLVM BB -> Machine BB
     std::map<const BasicBlock*, MachineBasicBlock*> MBBMap;
 
-    ISel(TargetMachine &tm) : TM(tm), F(0), BB(0) {}
+    ISel(TargetMachine &tm, IntrinsicLowering &il)
+      : TM(tm), IL(il), F(0), BB(0) {}
 
     /// runOnFunction - Top level implementation of instruction selection for
     /// the entire function.
     ///
     bool runOnFunction(Function &Fn) {
+      // First pass over the function, lower any unknown intrinsic functions
+      // with the IntrinsicLowering class.
+      LowerUnknownIntrinsicFunctionCalls(Fn);
+
       F = &MachineFunction::construct(&Fn, TM);
 
       // Create all of the machine basic blocks for the function...
@@ -111,6 +117,11 @@ namespace {
       BB = MBBMap[&LLVM_BB];
     }
 
+    /// LowerUnknownIntrinsicFunctionCalls - This performs a prepass over the
+    /// function, lowering any calls to unknown intrinsic functions into the
+    /// equivalent LLVM code.
+    void LowerUnknownIntrinsicFunctionCalls(Function &F);
+
     /// LoadArgumentsToVirtualRegs - Load all of the arguments to this function
     /// from the stack into virtual registers.
     ///
@@ -1087,6 +1098,33 @@ void ISel::visitCallInst(CallInst &CI) {
 }         
 
 
+/// LowerUnknownIntrinsicFunctionCalls - This performs a prepass over the
+/// function, lowering any calls to unknown intrinsic functions into the
+/// equivalent LLVM code.
+void ISel::LowerUnknownIntrinsicFunctionCalls(Function &F) {
+  for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
+    for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; )
+      if (CallInst *CI = dyn_cast<CallInst>(I++))
+        if (Function *F = CI->getCalledFunction())
+          switch (F->getIntrinsicID()) {
+          case Intrinsic::va_start:
+          case Intrinsic::va_copy:
+          case Intrinsic::va_end:
+            // We directly implement these intrinsics
+            break;
+          default:
+            // All other intrinsic calls we must lower.
+            Instruction *Before = CI->getPrev();
+            IL.LowerIntrinsicCall(CI);
+            if (Before) {        // Move iterator to instruction after call
+              I = Before;  ++I;
+            } else {
+              I = BB->begin();
+            }
+          }
+
+}
+
 void ISel::visitIntrinsicCall(Intrinsic::ID ID, CallInst &CI) {
   unsigned TmpReg1, TmpReg2;
   switch (ID) {
@@ -1103,17 +1141,7 @@ void ISel::visitIntrinsicCall(Intrinsic::ID ID, CallInst &CI) {
     return;
   case Intrinsic::va_end: return;   // Noop on X86
 
-  case Intrinsic::longjmp:
-  case Intrinsic::siglongjmp:
-    BuildMI(BB, X86::CALLpcrel32, 1).addExternalSymbol("abort", true); 
-    return;
-
-  case Intrinsic::setjmp:
-  case Intrinsic::sigsetjmp:
-    // Setjmp always returns zero...
-    BuildMI(BB, X86::MOVir32, 1, getReg(CI)).addZImm(0);
-    return;
-  default: assert(0 && "Unknown intrinsic for X86!");
+  default: assert(0 && "Error: unknown intrinsics should have been lowered!");
   }
 }
 
@@ -2167,8 +2195,7 @@ void ISel::visitFreeInst(FreeInst &I) {
 /// into a machine code representation is a very simple peep-hole fashion.  The
 /// generated code sucks but the implementation is nice and simple.
 ///
-FunctionPass *createX86SimpleInstructionSelector(TargetMachine &TM) {
-  return new ISel(TM);
+FunctionPass *llvm::createX86SimpleInstructionSelector(TargetMachine &TM,
+                                                       IntrinsicLowering &IL) {
+  return new ISel(TM, IL);
 }
-
-} // End llvm namespace

lib/Target/X86/X86.h

@@ -21,18 +21,21 @@ namespace llvm {
 
 class TargetMachine;
 class FunctionPass;
+class IntrinsicLowering;
 
 /// createX86SimpleInstructionSelector - This pass converts an LLVM function
 /// into a machine code representation in a very simple peep-hole fashion.  The
 /// generated code sucks but the implementation is nice and simple.
 ///
-FunctionPass *createX86SimpleInstructionSelector(TargetMachine &TM);
+FunctionPass *createX86SimpleInstructionSelector(TargetMachine &TM,
+                                                 IntrinsicLowering &IL);
 
 /// createX86PatternInstructionSelector - This pass converts an LLVM function
 /// into a machine code representation using pattern matching and a machine
 /// description file.
 ///
-FunctionPass *createX86PatternInstructionSelector(TargetMachine &TM);
+FunctionPass *createX86PatternInstructionSelector(TargetMachine &TM,
+                                                  IntrinsicLowering &IL);
 
 /// createX86SSAPeepholeOptimizerPass - Create a pass to perform SSA-based X86
 /// specific peephole optimizations.

lib/Target/X86/X86JITInfo.h

@@ -18,10 +18,13 @@
 
 namespace llvm {
   class TargetMachine;
+  class IntrinsicLowering;
+
   class X86JITInfo : public TargetJITInfo {
     TargetMachine &TM;
+    IntrinsicLowering &IL;
   public:
-    X86JITInfo(TargetMachine &tm) : TM(tm) {}
+    X86JITInfo(TargetMachine &tm, IntrinsicLowering &il) : TM(tm), IL(il) {}
 
     /// addPassesToJITCompile - Add passes to the specified pass manager to
     /// implement a fast dynamic compiler for this target.  Return true if this

lib/Target/X86/X86TargetMachine.cpp

@@ -13,6 +13,7 @@
 
 #include "X86TargetMachine.h"
 #include "X86.h"
+#include "llvm/IntrinsicLowering.h"
 #include "llvm/Module.h"
 #include "llvm/PassManager.h"
 #include "llvm/Target/TargetMachineImpls.h"
@@ -29,23 +30,30 @@ namespace {
   cl::opt<bool> NoPatternISel("disable-pattern-isel", cl::init(true),
                         cl::desc("Use the 'simple' X86 instruction selector"));
   cl::opt<bool> NoSSAPeephole("disable-ssa-peephole", cl::init(true),
-                        cl::desc("Disable the ssa-based peephole optimizer (defaults to disabled)"));
+                        cl::desc("Disable the ssa-based peephole optimizer "
+                                 "(defaults to disabled)"));
 }
 
 // allocateX86TargetMachine - Allocate and return a subclass of TargetMachine
 // that implements the X86 backend.
 //
-TargetMachine *llvm::allocateX86TargetMachine(const Module &M) {
-  return new X86TargetMachine(M);
+TargetMachine *llvm::allocateX86TargetMachine(const Module &M,
+                                              IntrinsicLowering *IL) {
+  return new X86TargetMachine(M, IL);
 }
 
 
 /// X86TargetMachine ctor - Create an ILP32 architecture model
 ///
-X86TargetMachine::X86TargetMachine(const Module &M)
+X86TargetMachine::X86TargetMachine(const Module &M, IntrinsicLowering *il)
   : TargetMachine("X86", true, 4, 4, 4, 4, 4),
+    IL(il ? il : new DefaultIntrinsicLowering()),
     FrameInfo(TargetFrameInfo::StackGrowsDown, 8/*16 for SSE*/, 4),
-    JITInfo(*this) {
+    JITInfo(*this, *IL) {
+}
+
+X86TargetMachine::~X86TargetMachine() {
+  delete IL;
 }
 
 
@@ -64,9 +72,9 @@ bool X86TargetMachine::addPassesToEmitAssembly(PassManager &PM,
   PM.add(createCFGSimplificationPass());
 
   if (NoPatternISel)
-    PM.add(createX86SimpleInstructionSelector(*this));
+    PM.add(createX86SimpleInstructionSelector(*this, *IL));
   else
-    PM.add(createX86PatternInstructionSelector(*this));
+    PM.add(createX86PatternInstructionSelector(*this, *IL));
 
   // Run optional SSA-based machine code optimizations next...
   if (!NoSSAPeephole)
@@ -119,9 +127,9 @@ void X86JITInfo::addPassesToJITCompile(FunctionPassManager &PM) {
   PM.add(createCFGSimplificationPass());
 
   if (NoPatternISel)
-    PM.add(createX86SimpleInstructionSelector(TM));
+    PM.add(createX86SimpleInstructionSelector(TM, IL));
   else
-    PM.add(createX86PatternInstructionSelector(TM));
+    PM.add(createX86PatternInstructionSelector(TM, IL));
 
   // Run optional SSA-based machine code optimizations next...
   if (!NoSSAPeephole)

lib/Target/X86/X86TargetMachine.h

@@ -21,13 +21,16 @@
 #include "X86JITInfo.h"
 
 namespace llvm {
+class IntrinsicLowering;
 
 class X86TargetMachine : public TargetMachine {
+  IntrinsicLowering *IL;
   X86InstrInfo    InstrInfo;
   TargetFrameInfo FrameInfo;
   X86JITInfo      JITInfo;
 public:
-  X86TargetMachine(const Module &M);
+  X86TargetMachine(const Module &M, IntrinsicLowering *IL);
+  ~X86TargetMachine();
 
   virtual const X86InstrInfo     &getInstrInfo() const { return InstrInfo; }
   virtual const TargetFrameInfo  &getFrameInfo() const { return FrameInfo; }