#include "X86RegisterInfo.h"
#include "X86Subtarget.h"
#include "X86TargetMachine.h"
-#include "llvm/Instructions.h"
+#include "llvm/CallingConv.h"
#include "llvm/DerivedTypes.h"
+#include "llvm/Instructions.h"
#include "llvm/CodeGen/FastISel.h"
#include "llvm/CodeGen/MachineConstantPool.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/Support/CallSite.h"
+#include "llvm/Support/GetElementPtrTypeIterator.h"
using namespace llvm;
/// Subtarget - Keep a pointer to the X86Subtarget around so that we can
/// make the right decision when generating code for different targets.
const X86Subtarget *Subtarget;
-
+
+ /// StackPtr - Register used as the stack pointer.
+ ///
+ unsigned StackPtr;
+
+ /// GlobalBaseReg - keeps track of the virtual register mapped onto global
+ /// base register.
+ unsigned GlobalBaseReg;
+
+ /// X86ScalarSSEf32, X86ScalarSSEf64 - Select between SSE or x87
+ /// floating point ops.
+ /// When SSE is available, use it for f32 operations.
+ /// When SSE2 is available, use it for f64 operations.
+ bool X86ScalarSSEf64;
+ bool X86ScalarSSEf32;
+
public:
explicit X86FastISel(MachineFunction &mf,
+ MachineModuleInfo *mmi,
DenseMap<const Value *, unsigned> &vm,
- DenseMap<const BasicBlock *, MachineBasicBlock *> &bm)
- : FastISel(mf, vm, bm) {
+ DenseMap<const BasicBlock *, MachineBasicBlock *> &bm,
+ DenseMap<const AllocaInst *, int> &am)
+ : FastISel(mf, mmi, vm, bm, am) {
Subtarget = &TM.getSubtarget<X86Subtarget>();
+ StackPtr = Subtarget->is64Bit() ? X86::RSP : X86::ESP;
+ GlobalBaseReg = 0;
+ X86ScalarSSEf64 = Subtarget->hasSSE2();
+ X86ScalarSSEf32 = Subtarget->hasSSE1();
}
virtual bool TargetSelectInstruction(Instruction *I);
#include "X86GenFastISel.inc"
private:
- bool X86FastEmitLoad(MVT VT, unsigned Op0, Value *V, unsigned &RR);
+ bool X86FastEmitLoad(MVT VT, const X86AddressMode &AM, unsigned &RR);
- bool X86FastEmitStore(MVT VT, unsigned Op0, unsigned Op1, Value *V);
+ bool X86FastEmitStore(MVT VT, unsigned Val,
+ const X86AddressMode &AM);
+
+ bool X86FastEmitExtend(ISD::NodeType Opc, MVT DstVT, unsigned Src, MVT SrcVT,
+ unsigned &ResultReg);
- bool X86SelectConstAddr(Value *V, unsigned &Op0);
+ bool X86SelectAddress(Value *V, X86AddressMode &AM, bool isCall);
bool X86SelectLoad(Instruction *I);
bool X86SelectSelect(Instruction *I);
- unsigned TargetMaterializeConstant(Constant *C, MachineConstantPool* MCP);
+ bool X86SelectTrunc(Instruction *I);
+
+ bool X86SelectFPExt(Instruction *I);
+ bool X86SelectFPTrunc(Instruction *I);
+
+ bool X86SelectCall(Instruction *I);
+
+ CCAssignFn *CCAssignFnForCall(unsigned CC, bool isTailCall = false);
+
+ unsigned getGlobalBaseReg();
+
+ const X86InstrInfo *getInstrInfo() const {
+ return static_cast<const X86InstrInfo *>(TM.getInstrInfo());
+ }
+
+ unsigned TargetMaterializeConstant(Constant *C);
+
+ unsigned TargetMaterializeAlloca(AllocaInst *C);
+
+ /// isScalarFPTypeInSSEReg - Return true if the specified scalar FP type is
+ /// computed in an SSE register, not on the X87 floating point stack.
+ bool isScalarFPTypeInSSEReg(MVT VT) const {
+ return (VT == MVT::f64 && X86ScalarSSEf64) || // f64 is when SSE2
+ (VT == MVT::f32 && X86ScalarSSEf32); // f32 is when SSE1
+ }
+
};
+static bool isTypeLegal(const Type *Ty, const TargetLowering &TLI, MVT &VT,
+ bool AllowI1 = false) {
+ VT = MVT::getMVT(Ty, /*HandleUnknown=*/true);
+ if (VT == MVT::Other || !VT.isSimple())
+ // Unhandled type. Halt "fast" selection and bail.
+ return false;
+ if (VT == MVT::iPTR)
+ // Use pointer type.
+ VT = TLI.getPointerTy();
+ // We only handle legal types. For example, on x86-32 the instruction
+ // selector contains all of the 64-bit instructions from x86-64,
+ // under the assumption that i64 won't be used if the target doesn't
+ // support it.
+ return (AllowI1 && VT == MVT::i1) || TLI.isTypeLegal(VT);
+}
+
+/// getGlobalBaseReg - Return the the global base register. Output
+/// instructions required to initialize the global base register, if necessary.
+///
+unsigned X86FastISel::getGlobalBaseReg() {
+ assert(!Subtarget->is64Bit() && "X86-64 PIC uses RIP relative addressing");
+ if (!GlobalBaseReg)
+ GlobalBaseReg = getInstrInfo()->initializeGlobalBaseReg(MBB->getParent());
+ return GlobalBaseReg;
+}
+
+#include "X86GenCallingConv.inc"
+
+/// CCAssignFnForCall - Selects the correct CCAssignFn for a given calling
+/// convention.
+CCAssignFn *X86FastISel::CCAssignFnForCall(unsigned CC, bool isTaillCall) {
+ if (Subtarget->is64Bit()) {
+ if (Subtarget->isTargetWin64())
+ return CC_X86_Win64_C;
+ else if (CC == CallingConv::Fast && isTaillCall)
+ return CC_X86_64_TailCall;
+ else
+ return CC_X86_64_C;
+ }
+
+ if (CC == CallingConv::X86_FastCall)
+ return CC_X86_32_FastCall;
+ else if (CC == CallingConv::Fast)
+ return CC_X86_32_FastCC;
+ else
+ return CC_X86_32_C;
+}
+
/// X86FastEmitLoad - Emit a machine instruction to load a value of type VT.
-/// The address is either pre-computed, i.e. Op0, or a GlobalAddress, i.e. V.
+/// The address is either pre-computed, i.e. Ptr, or a GlobalAddress, i.e. GV.
/// Return true and the result register by reference if it is possible.
-bool X86FastISel::X86FastEmitLoad(MVT VT, unsigned Op0, Value *V,
+bool X86FastISel::X86FastEmitLoad(MVT VT, const X86AddressMode &AM,
unsigned &ResultReg) {
// Get opcode and regclass of the output for the given load instruction.
unsigned Opc = 0;
}
ResultReg = createResultReg(RC);
- X86AddressMode AM;
- if (Op0)
- // Address is in register.
- AM.Base.Reg = Op0;
- else
- AM.GV = cast<GlobalValue>(V);
addFullAddress(BuildMI(MBB, TII.get(Opc), ResultReg), AM);
return true;
}
-/// X86FastEmitStore - Emit a machine instruction to store a value Op0 of
-/// type VT. The address is either pre-computed, i.e. Op1, or a GlobalAddress,
+/// X86FastEmitStore - Emit a machine instruction to store a value Val of
+/// type VT. The address is either pre-computed, consisted of a base ptr, Ptr
+/// and a displacement offset, or a GlobalAddress,
/// i.e. V. Return true if it is possible.
bool
-X86FastISel::X86FastEmitStore(MVT VT, unsigned Op0, unsigned Op1, Value *V) {
- // Get opcode and regclass of the output for the given load instruction.
+X86FastISel::X86FastEmitStore(MVT VT, unsigned Val,
+ const X86AddressMode &AM) {
+ // Get opcode and regclass of the output for the given store instruction.
unsigned Opc = 0;
const TargetRegisterClass *RC = NULL;
switch (VT.getSimpleVT()) {
break;
}
- X86AddressMode AM;
- if (Op1)
- // Address is in register.
- AM.Base.Reg = Op1;
- else
- AM.GV = cast<GlobalValue>(V);
- addFullAddress(BuildMI(MBB, TII.get(Opc)), AM).addReg(Op0);
+ addFullAddress(BuildMI(MBB, TII.get(Opc)), AM).addReg(Val);
return true;
}
-/// X86SelectConstAddr - Select and emit code to materialize constant address.
-///
-bool X86FastISel::X86SelectConstAddr(Value *V,
- unsigned &Op0) {
- // FIXME: Only GlobalAddress for now.
- GlobalValue *GV = dyn_cast<GlobalValue>(V);
- if (!GV)
+/// X86FastEmitExtend - Emit a machine instruction to extend a value Src of
+/// type SrcVT to type DstVT using the specified extension opcode Opc (e.g.
+/// ISD::SIGN_EXTEND).
+bool X86FastISel::X86FastEmitExtend(ISD::NodeType Opc, MVT DstVT,
+ unsigned Src, MVT SrcVT,
+ unsigned &ResultReg) {
+ unsigned RR = FastEmit_r(SrcVT.getSimpleVT(), DstVT.getSimpleVT(), Opc, Src);
+
+ if (RR != 0) {
+ ResultReg = RR;
+ return true;
+ } else
return false;
+}
- if (Subtarget->GVRequiresExtraLoad(GV, TM, false)) {
- // Issue load from stub if necessary.
- unsigned Opc = 0;
- const TargetRegisterClass *RC = NULL;
- if (TLI.getPointerTy() == MVT::i32) {
- Opc = X86::MOV32rm;
- RC = X86::GR32RegisterClass;
- } else {
- Opc = X86::MOV64rm;
- RC = X86::GR64RegisterClass;
+/// X86SelectAddress - Attempt to fill in an address from the given value.
+///
+bool X86FastISel::X86SelectAddress(Value *V, X86AddressMode &AM, bool isCall) {
+ User *U;
+ unsigned Opcode = Instruction::UserOp1;
+ if (Instruction *I = dyn_cast<Instruction>(V)) {
+ Opcode = I->getOpcode();
+ U = I;
+ } else if (ConstantExpr *C = dyn_cast<ConstantExpr>(V)) {
+ Opcode = C->getOpcode();
+ U = C;
+ }
+
+ switch (Opcode) {
+ default: break;
+ case Instruction::BitCast:
+ // Look past bitcasts.
+ return X86SelectAddress(U->getOperand(0), AM, isCall);
+
+ case Instruction::IntToPtr:
+ // Look past no-op inttoptrs.
+ if (TLI.getValueType(U->getOperand(0)->getType()) == TLI.getPointerTy())
+ return X86SelectAddress(U->getOperand(0), AM, isCall);
+
+ case Instruction::PtrToInt:
+ // Look past no-op ptrtoints.
+ if (TLI.getValueType(U->getType()) == TLI.getPointerTy())
+ return X86SelectAddress(U->getOperand(0), AM, isCall);
+
+ case Instruction::Alloca: {
+ if (isCall) break;
+ // Do static allocas.
+ const AllocaInst *A = cast<AllocaInst>(V);
+ DenseMap<const AllocaInst*, int>::iterator SI = StaticAllocaMap.find(A);
+ if (SI == StaticAllocaMap.end())
+ return false;
+ AM.BaseType = X86AddressMode::FrameIndexBase;
+ AM.Base.FrameIndex = SI->second;
+ return true;
+ }
+
+ case Instruction::Add: {
+ if (isCall) break;
+ // Adds of constants are common and easy enough.
+ if (ConstantInt *CI = dyn_cast<ConstantInt>(U->getOperand(1))) {
+ AM.Disp += CI->getZExtValue();
+ return X86SelectAddress(U->getOperand(0), AM, isCall);
}
- Op0 = createResultReg(RC);
- X86AddressMode AM;
+ break;
+ }
+
+ case Instruction::GetElementPtr: {
+ if (isCall) break;
+ // Pattern-match simple GEPs.
+ uint64_t Disp = AM.Disp;
+ unsigned IndexReg = AM.IndexReg;
+ unsigned Scale = AM.Scale;
+ gep_type_iterator GTI = gep_type_begin(U);
+ // Look at all but the last index. Constants can be folded,
+ // and one dynamic index can be handled, if the scale is supported.
+ for (User::op_iterator i = U->op_begin() + 1, e = U->op_end();
+ i != e; ++i, ++GTI) {
+ Value *Op = *i;
+ if (const StructType *STy = dyn_cast<StructType>(*GTI)) {
+ const StructLayout *SL = TD.getStructLayout(STy);
+ unsigned Idx = cast<ConstantInt>(Op)->getZExtValue();
+ Disp += SL->getElementOffset(Idx);
+ } else {
+ uint64_t S = TD.getABITypeSize(GTI.getIndexedType());
+ if (ConstantInt *CI = dyn_cast<ConstantInt>(Op)) {
+ // Constant-offset addressing.
+ Disp += CI->getZExtValue() * S;
+ } else if (IndexReg == 0 &&
+ (S == 1 || S == 2 || S == 4 || S == 8)) {
+ // Scaled-index addressing.
+ Scale = S;
+ IndexReg = getRegForValue(Op);
+ if (IndexReg == 0)
+ return false;
+ } else
+ // Unsupported.
+ goto unsupported_gep;
+ }
+ }
+ // Ok, the GEP indices were covered by constant-offset and scaled-index
+ // addressing. Update the address state and move on to examining the base.
+ AM.IndexReg = IndexReg;
+ AM.Scale = Scale;
+ AM.Disp = Disp;
+ return X86SelectAddress(U->getOperand(0), AM, isCall);
+ unsupported_gep:
+ // Ok, the GEP indices weren't all covered.
+ break;
+ }
+ }
+
+ // Handle constant address.
+ if (GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
+ // Can't handle alternate code models yet.
+ if (TM.getCodeModel() != CodeModel::Default &&
+ TM.getCodeModel() != CodeModel::Small)
+ return false;
+
+ // Set up the basic address.
AM.GV = GV;
- addFullAddress(BuildMI(MBB, TII.get(Opc), Op0), AM);
- // Prevent loading GV stub multiple times in same MBB.
- LocalValueMap[V] = Op0;
+ if (!isCall &&
+ TM.getRelocationModel() == Reloc::PIC_ &&
+ !Subtarget->is64Bit())
+ AM.Base.Reg = getGlobalBaseReg();
+
+ // Emit an extra load if the ABI requires it.
+ if (Subtarget->GVRequiresExtraLoad(GV, TM, isCall)) {
+ // Check to see if we've already materialized this
+ // value in a register in this block.
+ if (unsigned Reg = LocalValueMap[V]) {
+ AM.Base.Reg = Reg;
+ AM.GV = 0;
+ return true;
+ }
+ // Issue load from stub if necessary.
+ unsigned Opc = 0;
+ const TargetRegisterClass *RC = NULL;
+ if (TLI.getPointerTy() == MVT::i32) {
+ Opc = X86::MOV32rm;
+ RC = X86::GR32RegisterClass;
+ } else {
+ Opc = X86::MOV64rm;
+ RC = X86::GR64RegisterClass;
+ }
+ unsigned ResultReg = createResultReg(RC);
+ addFullAddress(BuildMI(MBB, TII.get(Opc), ResultReg), AM);
+ AM.Base.Reg = ResultReg;
+ AM.GV = 0;
+ // Prevent loading GV stub multiple times in same MBB.
+ LocalValueMap[V] = AM.Base.Reg;
+ }
+ return true;
}
- return true;
+
+ // If all else fails, just materialize the value in a register.
+ AM.Base.Reg = getRegForValue(V);
+ return AM.Base.Reg != 0;
}
/// X86SelectStore - Select and emit code to implement store instructions.
bool X86FastISel::X86SelectStore(Instruction* I) {
- MVT VT = MVT::getMVT(I->getOperand(0)->getType());
- if (VT == MVT::Other || !VT.isSimple())
- // Unhandled type. Halt "fast" selection and bail.
+ MVT VT;
+ if (!isTypeLegal(I->getOperand(0)->getType(), TLI, VT))
return false;
- if (VT == MVT::iPTR)
- // Use pointer type.
- VT = TLI.getPointerTy();
- // We only handle legal types. For example, on x86-32 the instruction
- // selector contains all of the 64-bit instructions from x86-64,
- // under the assumption that i64 won't be used if the target doesn't
- // support it.
- if (!TLI.isTypeLegal(VT))
- return false;
- unsigned Op0 = getRegForValue(I->getOperand(0));
- if (Op0 == 0)
+ unsigned Val = getRegForValue(I->getOperand(0));
+ if (Val == 0)
// Unhandled operand. Halt "fast" selection and bail.
return false;
- Value *V = I->getOperand(1);
- unsigned Op1 = getRegForValue(V);
- if (Op1 == 0) {
- // Handle constant load address.
- if (!isa<Constant>(V) || !X86SelectConstAddr(V, Op1))
- // Unhandled operand. Halt "fast" selection and bail.
- return false;
- }
+ X86AddressMode AM;
+ if (!X86SelectAddress(I->getOperand(1), AM, false))
+ return false;
- return X86FastEmitStore(VT, Op0, Op1, V);
+ return X86FastEmitStore(VT, Val, AM);
}
/// X86SelectLoad - Select and emit code to implement load instructions.
///
bool X86FastISel::X86SelectLoad(Instruction *I) {
- MVT VT = MVT::getMVT(I->getType(), /*HandleUnknown=*/true);
- if (VT == MVT::Other || !VT.isSimple())
- // Unhandled type. Halt "fast" selection and bail.
- return false;
- if (VT == MVT::iPTR)
- // Use pointer type.
- VT = TLI.getPointerTy();
- // We only handle legal types. For example, on x86-32 the instruction
- // selector contains all of the 64-bit instructions from x86-64,
- // under the assumption that i64 won't be used if the target doesn't
- // support it.
- if (!TLI.isTypeLegal(VT))
+ MVT VT;
+ if (!isTypeLegal(I->getType(), TLI, VT))
return false;
- Value *V = I->getOperand(0);
- unsigned Op0 = getRegForValue(V);
- if (Op0 == 0) {
- // Handle constant load address.
- // FIXME: If load type is something we can't handle, this can result in
- // a dead stub load instruction.
- if (!isa<Constant>(V) || !X86SelectConstAddr(V, Op0))
- // Unhandled operand. Halt "fast" selection and bail.
- return false;
- }
+ X86AddressMode AM;
+ if (!X86SelectAddress(I->getOperand(0), AM, false))
+ return false;
unsigned ResultReg = 0;
- if (X86FastEmitLoad(VT, Op0, V, ResultReg)) {
+ if (X86FastEmitLoad(VT, AM, ResultReg)) {
UpdateValueMap(I, ResultReg);
return true;
}
}
bool X86FastISel::X86SelectShift(Instruction *I) {
- unsigned CReg = 0;
- unsigned Opc = 0;
+ unsigned CReg = 0, OpReg = 0, OpImm = 0;
const TargetRegisterClass *RC = NULL;
if (I->getType() == Type::Int8Ty) {
CReg = X86::CL;
RC = &X86::GR8RegClass;
switch (I->getOpcode()) {
- case Instruction::LShr: Opc = X86::SHR8rCL; break;
- case Instruction::AShr: Opc = X86::SAR8rCL; break;
- case Instruction::Shl: Opc = X86::SHL8rCL; break;
+ case Instruction::LShr: OpReg = X86::SHR8rCL; OpImm = X86::SHR8ri; break;
+ case Instruction::AShr: OpReg = X86::SAR8rCL; OpImm = X86::SAR8ri; break;
+ case Instruction::Shl: OpReg = X86::SHL8rCL; OpImm = X86::SHL8ri; break;
default: return false;
}
} else if (I->getType() == Type::Int16Ty) {
CReg = X86::CX;
RC = &X86::GR16RegClass;
switch (I->getOpcode()) {
- case Instruction::LShr: Opc = X86::SHR16rCL; break;
- case Instruction::AShr: Opc = X86::SAR16rCL; break;
- case Instruction::Shl: Opc = X86::SHL16rCL; break;
+ case Instruction::LShr: OpReg = X86::SHR16rCL; OpImm = X86::SHR16ri; break;
+ case Instruction::AShr: OpReg = X86::SAR16rCL; OpImm = X86::SAR16ri; break;
+ case Instruction::Shl: OpReg = X86::SHL16rCL; OpImm = X86::SHL16ri; break;
default: return false;
}
} else if (I->getType() == Type::Int32Ty) {
CReg = X86::ECX;
RC = &X86::GR32RegClass;
switch (I->getOpcode()) {
- case Instruction::LShr: Opc = X86::SHR32rCL; break;
- case Instruction::AShr: Opc = X86::SAR32rCL; break;
- case Instruction::Shl: Opc = X86::SHL32rCL; break;
+ case Instruction::LShr: OpReg = X86::SHR32rCL; OpImm = X86::SHR32ri; break;
+ case Instruction::AShr: OpReg = X86::SAR32rCL; OpImm = X86::SAR32ri; break;
+ case Instruction::Shl: OpReg = X86::SHL32rCL; OpImm = X86::SHL32ri; break;
default: return false;
}
} else if (I->getType() == Type::Int64Ty) {
CReg = X86::RCX;
RC = &X86::GR64RegClass;
switch (I->getOpcode()) {
- case Instruction::LShr: Opc = X86::SHR64rCL; break;
- case Instruction::AShr: Opc = X86::SAR64rCL; break;
- case Instruction::Shl: Opc = X86::SHL64rCL; break;
+ case Instruction::LShr: OpReg = X86::SHR64rCL; OpImm = X86::SHR64ri; break;
+ case Instruction::AShr: OpReg = X86::SAR64rCL; OpImm = X86::SAR64ri; break;
+ case Instruction::Shl: OpReg = X86::SHL64rCL; OpImm = X86::SHL64ri; break;
default: return false;
}
} else {
return false;
}
+ MVT VT = MVT::getMVT(I->getType(), /*HandleUnknown=*/true);
+ if (VT == MVT::Other || !TLI.isTypeLegal(VT))
+ return false;
+
unsigned Op0Reg = getRegForValue(I->getOperand(0));
if (Op0Reg == 0) return false;
+
+ // Fold immediate in shl(x,3).
+ if (ConstantInt *CI = dyn_cast<ConstantInt>(I->getOperand(1))) {
+ unsigned ResultReg = createResultReg(RC);
+ BuildMI(MBB, TII.get(OpImm),
+ ResultReg).addReg(Op0Reg).addImm(CI->getZExtValue());
+ UpdateValueMap(I, ResultReg);
+ return true;
+ }
+
unsigned Op1Reg = getRegForValue(I->getOperand(1));
if (Op1Reg == 0) return false;
TII.copyRegToReg(*MBB, MBB->end(), CReg, Op1Reg, RC, RC);
unsigned ResultReg = createResultReg(RC);
- BuildMI(MBB, TII.get(Opc), ResultReg).addReg(Op0Reg);
+ BuildMI(MBB, TII.get(OpReg), ResultReg).addReg(Op0Reg);
UpdateValueMap(I, ResultReg);
return true;
}
bool X86FastISel::X86SelectSelect(Instruction *I) {
- const Type *Ty = I->getOperand(1)->getType();
+ const Type *Ty = I->getType();
if (isa<PointerType>(Ty))
- Ty = TLI.getTargetData()->getIntPtrType();
+ Ty = TD.getIntPtrType();
unsigned Opc = 0;
const TargetRegisterClass *RC = NULL;
return false;
}
+ MVT VT = MVT::getMVT(Ty, /*HandleUnknown=*/true);
+ if (VT == MVT::Other || !TLI.isTypeLegal(VT))
+ return false;
+
unsigned Op0Reg = getRegForValue(I->getOperand(0));
if (Op0Reg == 0) return false;
unsigned Op1Reg = getRegForValue(I->getOperand(1));
return true;
}
+bool X86FastISel::X86SelectFPExt(Instruction *I) {
+ if (Subtarget->hasSSE2()) {
+ if (I->getType() == Type::DoubleTy) {
+ Value *V = I->getOperand(0);
+ if (V->getType() == Type::FloatTy) {
+ unsigned OpReg = getRegForValue(V);
+ if (OpReg == 0) return false;
+ unsigned ResultReg = createResultReg(X86::FR64RegisterClass);
+ BuildMI(MBB, TII.get(X86::CVTSS2SDrr), ResultReg).addReg(OpReg);
+ UpdateValueMap(I, ResultReg);
+ return true;
+ }
+ }
+ }
+
+ return false;
+}
+
+bool X86FastISel::X86SelectFPTrunc(Instruction *I) {
+ if (Subtarget->hasSSE2()) {
+ if (I->getType() == Type::FloatTy) {
+ Value *V = I->getOperand(0);
+ if (V->getType() == Type::DoubleTy) {
+ unsigned OpReg = getRegForValue(V);
+ if (OpReg == 0) return false;
+ unsigned ResultReg = createResultReg(X86::FR32RegisterClass);
+ BuildMI(MBB, TII.get(X86::CVTSD2SSrr), ResultReg).addReg(OpReg);
+ UpdateValueMap(I, ResultReg);
+ return true;
+ }
+ }
+ }
+
+ return false;
+}
+
+bool X86FastISel::X86SelectTrunc(Instruction *I) {
+ if (Subtarget->is64Bit())
+ // All other cases should be handled by the tblgen generated code.
+ return false;
+ MVT SrcVT = TLI.getValueType(I->getOperand(0)->getType());
+ MVT DstVT = TLI.getValueType(I->getType());
+ if (DstVT != MVT::i8)
+ // All other cases should be handled by the tblgen generated code.
+ return false;
+ if (SrcVT != MVT::i16 && SrcVT != MVT::i32)
+ // All other cases should be handled by the tblgen generated code.
+ return false;
+
+ unsigned InputReg = getRegForValue(I->getOperand(0));
+ if (!InputReg)
+ // Unhandled operand. Halt "fast" selection and bail.
+ return false;
+
+ // First issue a copy to GR16_ or GR32_.
+ unsigned CopyOpc = (SrcVT == MVT::i16) ? X86::MOV16to16_ : X86::MOV32to32_;
+ const TargetRegisterClass *CopyRC = (SrcVT == MVT::i16)
+ ? X86::GR16_RegisterClass : X86::GR32_RegisterClass;
+ unsigned CopyReg = createResultReg(CopyRC);
+ BuildMI(MBB, TII.get(CopyOpc), CopyReg).addReg(InputReg);
+
+ // Then issue an extract_subreg.
+ unsigned ResultReg = FastEmitInst_extractsubreg(CopyReg,1); // x86_subreg_8bit
+ if (!ResultReg)
+ return false;
+
+ UpdateValueMap(I, ResultReg);
+ return true;
+}
+
+bool X86FastISel::X86SelectCall(Instruction *I) {
+ CallInst *CI = cast<CallInst>(I);
+ Value *Callee = I->getOperand(0);
+
+ // Can't handle inline asm yet.
+ if (isa<InlineAsm>(Callee))
+ return false;
+
+ // FIXME: Handle some intrinsics.
+ if (Function *F = CI->getCalledFunction()) {
+ if (F->isDeclaration() &&F->getIntrinsicID())
+ return false;
+ }
+
+ // Handle only C and fastcc calling conventions for now.
+ CallSite CS(CI);
+ unsigned CC = CS.getCallingConv();
+ if (CC != CallingConv::C &&
+ CC != CallingConv::Fast &&
+ CC != CallingConv::X86_FastCall)
+ return false;
+
+ // Let SDISel handle vararg functions.
+ const PointerType *PT = cast<PointerType>(CS.getCalledValue()->getType());
+ const FunctionType *FTy = cast<FunctionType>(PT->getElementType());
+ if (FTy->isVarArg())
+ return false;
+
+ // Handle *simple* calls for now.
+ const Type *RetTy = CS.getType();
+ MVT RetVT;
+ if (RetTy == Type::VoidTy)
+ RetVT = MVT::isVoid;
+ else if (!isTypeLegal(RetTy, TLI, RetVT, true))
+ return false;
+
+ // Materialize callee address in a register. FIXME: GV address can be
+ // handled with a CALLpcrel32 instead.
+ X86AddressMode CalleeAM;
+ if (!X86SelectAddress(Callee, CalleeAM, true))
+ return false;
+ unsigned CalleeOp = 0;
+ GlobalValue *GV = 0;
+ if (CalleeAM.Base.Reg != 0) {
+ assert(CalleeAM.GV == 0);
+ CalleeOp = CalleeAM.Base.Reg;
+ } else if (CalleeAM.GV != 0) {
+ assert(CalleeAM.GV != 0);
+ GV = CalleeAM.GV;
+ } else
+ return false;
+
+ // Allow calls which produce i1 results.
+ bool AndToI1 = false;
+ if (RetVT == MVT::i1) {
+ RetVT = MVT::i8;
+ AndToI1 = true;
+ }
+
+ // Deal with call operands first.
+ SmallVector<unsigned, 4> Args;
+ SmallVector<MVT, 4> ArgVTs;
+ SmallVector<ISD::ArgFlagsTy, 4> ArgFlags;
+ Args.reserve(CS.arg_size());
+ ArgVTs.reserve(CS.arg_size());
+ ArgFlags.reserve(CS.arg_size());
+ for (CallSite::arg_iterator i = CS.arg_begin(), e = CS.arg_end();
+ i != e; ++i) {
+ unsigned Arg = getRegForValue(*i);
+ if (Arg == 0)
+ return false;
+ ISD::ArgFlagsTy Flags;
+ unsigned AttrInd = i - CS.arg_begin() + 1;
+ if (CS.paramHasAttr(AttrInd, ParamAttr::SExt))
+ Flags.setSExt();
+ if (CS.paramHasAttr(AttrInd, ParamAttr::ZExt))
+ Flags.setZExt();
+
+ // FIXME: Only handle *easy* calls for now.
+ if (CS.paramHasAttr(AttrInd, ParamAttr::InReg) ||
+ CS.paramHasAttr(AttrInd, ParamAttr::StructRet) ||
+ CS.paramHasAttr(AttrInd, ParamAttr::Nest) ||
+ CS.paramHasAttr(AttrInd, ParamAttr::ByVal))
+ return false;
+
+ const Type *ArgTy = (*i)->getType();
+ MVT ArgVT;
+ if (!isTypeLegal(ArgTy, TLI, ArgVT))
+ return false;
+ unsigned OriginalAlignment = TD.getABITypeAlignment(ArgTy);
+ Flags.setOrigAlign(OriginalAlignment);
+
+ Args.push_back(Arg);
+ ArgVTs.push_back(ArgVT);
+ ArgFlags.push_back(Flags);
+ }
+
+ // Analyze operands of the call, assigning locations to each operand.
+ SmallVector<CCValAssign, 16> ArgLocs;
+ CCState CCInfo(CC, false, TM, ArgLocs);
+ CCInfo.AnalyzeCallOperands(ArgVTs, ArgFlags, CCAssignFnForCall(CC));
+
+ // Get a count of how many bytes are to be pushed on the stack.
+ unsigned NumBytes = CCInfo.getNextStackOffset();
+
+ // Issue CALLSEQ_START
+ BuildMI(MBB, TII.get(X86::ADJCALLSTACKDOWN)).addImm(NumBytes);
+
+ // Process argumenet: walk the register/memloc assignments, inserting
+ // copies / loads.
+ SmallVector<unsigned, 4> RegArgs;
+ for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
+ CCValAssign &VA = ArgLocs[i];
+ unsigned Arg = Args[VA.getValNo()];
+ MVT ArgVT = ArgVTs[VA.getValNo()];
+
+ // Promote the value if needed.
+ switch (VA.getLocInfo()) {
+ default: assert(0 && "Unknown loc info!");
+ case CCValAssign::Full: break;
+ case CCValAssign::SExt: {
+ bool Emitted = X86FastEmitExtend(ISD::SIGN_EXTEND, VA.getLocVT(),
+ Arg, ArgVT, Arg);
+ assert(Emitted && "Failed to emit a sext!");
+ ArgVT = VA.getLocVT();
+ break;
+ }
+ case CCValAssign::ZExt: {
+ bool Emitted = X86FastEmitExtend(ISD::ZERO_EXTEND, VA.getLocVT(),
+ Arg, ArgVT, Arg);
+ assert(Emitted && "Failed to emit a zext!");
+ ArgVT = VA.getLocVT();
+ break;
+ }
+ case CCValAssign::AExt: {
+ bool Emitted = X86FastEmitExtend(ISD::ANY_EXTEND, VA.getLocVT(),
+ Arg, ArgVT, Arg);
+ if (!Emitted)
+ Emitted = X86FastEmitExtend(ISD::ZERO_EXTEND, VA.getLocVT(),
+ Arg, ArgVT, Arg);
+ if (!Emitted)
+ Emitted = X86FastEmitExtend(ISD::SIGN_EXTEND, VA.getLocVT(),
+ Arg, ArgVT, Arg);
+
+ assert(Emitted && "Failed to emit a aext!");
+ ArgVT = VA.getLocVT();
+ break;
+ }
+ }
+
+ if (VA.isRegLoc()) {
+ TargetRegisterClass* RC = TLI.getRegClassFor(ArgVT);
+ bool Emitted = TII.copyRegToReg(*MBB, MBB->end(), VA.getLocReg(),
+ Arg, RC, RC);
+ assert(Emitted && "Failed to emit a copy instruction!");
+ RegArgs.push_back(VA.getLocReg());
+ } else {
+ unsigned LocMemOffset = VA.getLocMemOffset();
+ X86AddressMode AM;
+ AM.Base.Reg = StackPtr;
+ AM.Disp = LocMemOffset;
+ X86FastEmitStore(ArgVT, Arg, AM);
+ }
+ }
+
+ // ELF / PIC requires GOT in the EBX register before function calls via PLT
+ // GOT pointer.
+ if (!Subtarget->is64Bit() &&
+ TM.getRelocationModel() == Reloc::PIC_ &&
+ Subtarget->isPICStyleGOT()) {
+ TargetRegisterClass *RC = X86::GR32RegisterClass;
+ unsigned Base = getGlobalBaseReg();
+ bool Emitted = TII.copyRegToReg(*MBB, MBB->end(), X86::EBX, Base, RC, RC);
+ assert(Emitted && "Failed to emit a copy instruction!");
+ }
+
+ // Issue the call.
+ unsigned CallOpc = CalleeOp
+ ? (Subtarget->is64Bit() ? X86::CALL64r : X86::CALL32r)
+ : (Subtarget->is64Bit() ? X86::CALL64pcrel32 : X86::CALLpcrel32);
+ MachineInstrBuilder MIB = CalleeOp
+ ? BuildMI(MBB, TII.get(CallOpc)).addReg(CalleeOp)
+ : BuildMI(MBB, TII.get(CallOpc)).addGlobalAddress(GV);
+
+ // Add an implicit use GOT pointer in EBX.
+ if (!Subtarget->is64Bit() &&
+ TM.getRelocationModel() == Reloc::PIC_ &&
+ Subtarget->isPICStyleGOT())
+ MIB.addReg(X86::EBX);
+
+ // Add implicit physical register uses to the call.
+ while (!RegArgs.empty()) {
+ MIB.addReg(RegArgs.back());
+ RegArgs.pop_back();
+ }
+
+ // Issue CALLSEQ_END
+ BuildMI(MBB, TII.get(X86::ADJCALLSTACKUP)).addImm(NumBytes).addImm(0);
+
+ // Now handle call return value (if any).
+ if (RetVT.getSimpleVT() != MVT::isVoid) {
+ SmallVector<CCValAssign, 16> RVLocs;
+ CCState CCInfo(CC, false, TM, RVLocs);
+ CCInfo.AnalyzeCallResult(RetVT, RetCC_X86);
+
+ // Copy all of the result registers out of their specified physreg.
+ assert(RVLocs.size() == 1 && "Can't handle multi-value calls!");
+ MVT CopyVT = RVLocs[0].getValVT();
+ TargetRegisterClass* DstRC = TLI.getRegClassFor(CopyVT);
+ TargetRegisterClass *SrcRC = DstRC;
+
+ // If this is a call to a function that returns an fp value on the x87 fp
+ // stack, but where we prefer to use the value in xmm registers, copy it
+ // out as F80 and use a truncate to move it from fp stack reg to xmm reg.
+ if ((RVLocs[0].getLocReg() == X86::ST0 ||
+ RVLocs[0].getLocReg() == X86::ST1) &&
+ isScalarFPTypeInSSEReg(RVLocs[0].getValVT())) {
+ CopyVT = MVT::f80;
+ SrcRC = X86::RSTRegisterClass;
+ DstRC = X86::RFP80RegisterClass;
+ }
+
+ unsigned ResultReg = createResultReg(DstRC);
+ bool Emitted = TII.copyRegToReg(*MBB, MBB->end(), ResultReg,
+ RVLocs[0].getLocReg(), DstRC, SrcRC);
+ assert(Emitted && "Failed to emit a copy instruction!");
+ if (CopyVT != RVLocs[0].getValVT()) {
+ // Round the F80 the right size, which also moves to the appropriate xmm
+ // register. This is accomplished by storing the F80 value in memory and
+ // then loading it back. Ewww...
+ MVT ResVT = RVLocs[0].getValVT();
+ unsigned Opc = ResVT == MVT::f32 ? X86::ST_Fp80m32 : X86::ST_Fp80m64;
+ unsigned MemSize = ResVT.getSizeInBits()/8;
+ int FI = MFI.CreateStackObject(MemSize, MemSize);
+ addFrameReference(BuildMI(MBB, TII.get(Opc)), FI).addReg(ResultReg);
+ DstRC = ResVT == MVT::f32
+ ? X86::FR32RegisterClass : X86::FR64RegisterClass;
+ Opc = ResVT == MVT::f32 ? X86::MOVSSrm : X86::MOVSDrm;
+ ResultReg = createResultReg(DstRC);
+ addFrameReference(BuildMI(MBB, TII.get(Opc), ResultReg), FI);
+ }
+
+ if (AndToI1) {
+ // Mask out all but lowest bit for some call which produces an i1.
+ unsigned AndResult = createResultReg(X86::GR8RegisterClass);
+ BuildMI(MBB, TII.get(X86::AND8ri), AndResult).addReg(ResultReg).addImm(1);
+ ResultReg = AndResult;
+ }
+
+ UpdateValueMap(I, ResultReg);
+ }
+
+ return true;
+}
+
+
bool
X86FastISel::TargetSelectInstruction(Instruction *I) {
switch (I->getOpcode()) {
return X86SelectZExt(I);
case Instruction::Br:
return X86SelectBranch(I);
+ case Instruction::Call:
+ return X86SelectCall(I);
case Instruction::LShr:
case Instruction::AShr:
case Instruction::Shl:
return X86SelectShift(I);
case Instruction::Select:
return X86SelectSelect(I);
+ case Instruction::Trunc:
+ return X86SelectTrunc(I);
+ case Instruction::FPExt:
+ return X86SelectFPExt(I);
+ case Instruction::FPTrunc:
+ return X86SelectFPTrunc(I);
}
return false;
}
-unsigned X86FastISel::TargetMaterializeConstant(Constant *C,
- MachineConstantPool* MCP) {
- unsigned CPLoad = getRegForValue(C);
- if (CPLoad != 0)
- return CPLoad;
-
- // Can't handle PIC-mode yet.
- if (TM.getRelocationModel() == Reloc::PIC_)
- return 0;
-
- MVT VT = MVT::getMVT(C->getType(), /*HandleUnknown=*/true);
- if (VT == MVT::Other || !VT.isSimple())
- // Unhandled type. Halt "fast" selection and bail.
- return false;
- if (VT == MVT::iPTR)
- // Use pointer type.
- VT = TLI.getPointerTy();
- // We only handle legal types. For example, on x86-32 the instruction
- // selector contains all of the 64-bit instructions from x86-64,
- // under the assumption that i64 won't be used if the target doesn't
- // support it.
- if (!TLI.isTypeLegal(VT))
+unsigned X86FastISel::TargetMaterializeConstant(Constant *C) {
+ MVT VT;
+ if (!isTypeLegal(C->getType(), TLI, VT))
return false;
// Get opcode and regclass of the output for the given load instruction.
break;
}
- unsigned ResultReg = createResultReg(RC);
+ // Materialize addresses with LEA instructions.
if (isa<GlobalValue>(C)) {
- // FIXME: If store value type is something we can't handle, this can result
- // in a dead stub load instruction.
- if (X86SelectConstAddr(C, ResultReg))
+ X86AddressMode AM;
+ if (X86SelectAddress(C, AM, false)) {
+ if (TLI.getPointerTy() == MVT::i32)
+ Opc = X86::LEA32r;
+ else
+ Opc = X86::LEA64r;
+ unsigned ResultReg = createResultReg(RC);
+ addFullAddress(BuildMI(MBB, TII.get(Opc), ResultReg), AM);
return ResultReg;
+ }
return 0;
}
+ // MachineConstantPool wants an explicit alignment.
+ unsigned Align = TD.getPreferredTypeAlignmentShift(C->getType());
+ if (Align == 0) {
+ // Alignment of vector types. FIXME!
+ Align = TD.getABITypeSize(C->getType());
+ Align = Log2_64(Align);
+ }
- unsigned MCPOffset = MCP->getConstantPoolIndex(C, 0);
+ unsigned MCPOffset = MCP.getConstantPoolIndex(C, Align);
+ unsigned ResultReg = createResultReg(RC);
addConstantPoolReference(BuildMI(MBB, TII.get(Opc), ResultReg), MCPOffset);
- UpdateValueMap(C, ResultReg);
+ return ResultReg;
+}
+
+unsigned X86FastISel::TargetMaterializeAlloca(AllocaInst *C) {
+ X86AddressMode AM;
+ if (!X86SelectAddress(C, AM, false))
+ return 0;
+ unsigned Opc = Subtarget->is64Bit() ? X86::LEA64r : X86::LEA32r;
+ TargetRegisterClass* RC = TLI.getRegClassFor(TLI.getPointerTy());
+ unsigned ResultReg = createResultReg(RC);
+ addFullAddress(BuildMI(MBB, TII.get(Opc), ResultReg), AM);
return ResultReg;
}
namespace llvm {
llvm::FastISel *X86::createFastISel(MachineFunction &mf,
+ MachineModuleInfo *mmi,
DenseMap<const Value *, unsigned> &vm,
- DenseMap<const BasicBlock *, MachineBasicBlock *> &bm) {
- return new X86FastISel(mf, vm, bm);
+ DenseMap<const BasicBlock *, MachineBasicBlock *> &bm,
+ DenseMap<const AllocaInst *, int> &am) {
+ return new X86FastISel(mf, mmi, vm, bm, am);
}
}
projects / oota-llvm.git / blobdiff