2008-08-14 04:19:35 +08:00
|
|
|
///===-- FastISel.cpp - Implementation of the FastISel class --------------===//
|
|
|
|
//
|
|
|
|
// The LLVM Compiler Infrastructure
|
|
|
|
//
|
|
|
|
// This file is distributed under the University of Illinois Open Source
|
|
|
|
// License. See LICENSE.TXT for details.
|
|
|
|
//
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
//
|
|
|
|
// This file contains the implementation of the FastISel class.
|
|
|
|
//
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
|
2008-08-20 06:31:46 +08:00
|
|
|
#include "llvm/Instructions.h"
|
2008-08-14 04:19:35 +08:00
|
|
|
#include "llvm/CodeGen/FastISel.h"
|
|
|
|
#include "llvm/CodeGen/MachineInstrBuilder.h"
|
|
|
|
#include "llvm/CodeGen/MachineRegisterInfo.h"
|
2008-08-21 06:45:34 +08:00
|
|
|
#include "llvm/Target/TargetData.h"
|
2008-08-14 04:19:35 +08:00
|
|
|
#include "llvm/Target/TargetInstrInfo.h"
|
2008-08-21 06:45:34 +08:00
|
|
|
#include "llvm/Target/TargetLowering.h"
|
2008-08-21 05:05:57 +08:00
|
|
|
#include "llvm/Target/TargetMachine.h"
|
2008-08-14 04:19:35 +08:00
|
|
|
using namespace llvm;
|
|
|
|
|
2008-08-28 02:10:19 +08:00
|
|
|
unsigned FastISel::getRegForValue(Value *V, DenseMap<const Value*, unsigned> &ValueMap) {
|
|
|
|
unsigned &Reg = ValueMap[V];
|
|
|
|
if (Reg != 0)
|
|
|
|
return Reg;
|
|
|
|
|
|
|
|
MVT::SimpleValueType VT = TLI.getValueType(V->getType()).getSimpleVT();
|
|
|
|
if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
|
|
|
|
if (CI->getValue().getActiveBits() > 64)
|
|
|
|
return 0;
|
|
|
|
Reg = FastEmit_i(VT, VT, ISD::Constant, CI->getZExtValue());
|
|
|
|
} else if (ConstantFP *CF = dyn_cast<ConstantFP>(V)) {
|
|
|
|
Reg = FastEmit_f(VT, VT, ISD::ConstantFP, CF);
|
|
|
|
|
|
|
|
if (!Reg) {
|
|
|
|
const APFloat &Flt = CF->getValueAPF();
|
|
|
|
MVT IntVT = TLI.getPointerTy();
|
|
|
|
|
|
|
|
uint64_t x[2];
|
|
|
|
uint32_t IntBitWidth = IntVT.getSizeInBits();
|
|
|
|
if (Flt.convertToInteger(x, IntBitWidth, /*isSigned=*/true,
|
|
|
|
APFloat::rmTowardZero) != APFloat::opOK)
|
|
|
|
return 0;
|
|
|
|
APInt IntVal(IntBitWidth, 2, x);
|
|
|
|
|
|
|
|
unsigned IntegerReg = FastEmit_i(IntVT.getSimpleVT(), IntVT.getSimpleVT(),
|
|
|
|
ISD::Constant, IntVal.getZExtValue());
|
|
|
|
if (IntegerReg == 0)
|
|
|
|
return 0;
|
|
|
|
Reg = FastEmit_r(IntVT.getSimpleVT(), VT, ISD::SINT_TO_FP, IntegerReg);
|
|
|
|
if (Reg == 0)
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return Reg;
|
|
|
|
}
|
|
|
|
|
2008-08-20 08:11:48 +08:00
|
|
|
/// SelectBinaryOp - Select and emit code for a binary operator instruction,
|
|
|
|
/// which has an opcode which directly corresponds to the given ISD opcode.
|
|
|
|
///
|
|
|
|
bool FastISel::SelectBinaryOp(Instruction *I, ISD::NodeType ISDOpcode,
|
|
|
|
DenseMap<const Value*, unsigned> &ValueMap) {
|
2008-08-21 09:41:07 +08:00
|
|
|
MVT VT = MVT::getMVT(I->getType(), /*HandleUnknown=*/true);
|
|
|
|
if (VT == MVT::Other || !VT.isSimple())
|
|
|
|
// Unhandled type. Halt "fast" selection and bail.
|
|
|
|
return false;
|
2008-08-27 04:52:40 +08:00
|
|
|
// 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;
|
2008-08-21 09:41:07 +08:00
|
|
|
|
2008-08-28 02:10:19 +08:00
|
|
|
unsigned Op0 = getRegForValue(I->getOperand(0), ValueMap);
|
2008-08-21 09:41:07 +08:00
|
|
|
if (Op0 == 0)
|
2008-08-20 08:35:17 +08:00
|
|
|
// Unhandled operand. Halt "fast" selection and bail.
|
|
|
|
return false;
|
|
|
|
|
2008-08-21 09:41:07 +08:00
|
|
|
// Check if the second operand is a constant and handle it appropriately.
|
|
|
|
if (ConstantInt *CI = dyn_cast<ConstantInt>(I->getOperand(1))) {
|
2008-08-28 02:10:19 +08:00
|
|
|
unsigned ResultReg = FastEmit_ri(VT.getSimpleVT(), VT.getSimpleVT(),
|
|
|
|
ISDOpcode, Op0, CI->getZExtValue());
|
|
|
|
if (ResultReg != 0) {
|
|
|
|
// We successfully emitted code for the given LLVM Instruction.
|
|
|
|
ValueMap[I] = ResultReg;
|
|
|
|
return true;
|
|
|
|
}
|
2008-08-21 09:41:07 +08:00
|
|
|
}
|
|
|
|
|
2008-08-27 09:09:54 +08:00
|
|
|
// Check if the second operand is a constant float.
|
|
|
|
if (ConstantFP *CF = dyn_cast<ConstantFP>(I->getOperand(1))) {
|
2008-08-28 02:10:19 +08:00
|
|
|
unsigned ResultReg = FastEmit_rf(VT.getSimpleVT(), VT.getSimpleVT(),
|
|
|
|
ISDOpcode, Op0, CF);
|
|
|
|
if (ResultReg != 0) {
|
|
|
|
// We successfully emitted code for the given LLVM Instruction.
|
|
|
|
ValueMap[I] = ResultReg;
|
|
|
|
return true;
|
|
|
|
}
|
2008-08-27 09:09:54 +08:00
|
|
|
}
|
|
|
|
|
2008-08-28 02:10:19 +08:00
|
|
|
unsigned Op1 = getRegForValue(I->getOperand(1), ValueMap);
|
2008-08-21 09:41:07 +08:00
|
|
|
if (Op1 == 0)
|
|
|
|
// Unhandled operand. Halt "fast" selection and bail.
|
2008-08-20 08:11:48 +08:00
|
|
|
return false;
|
|
|
|
|
2008-08-28 02:10:19 +08:00
|
|
|
// Now we have both operands in registers. Emit the instruction.
|
2008-08-26 07:58:18 +08:00
|
|
|
unsigned ResultReg = FastEmit_rr(VT.getSimpleVT(), VT.getSimpleVT(),
|
|
|
|
ISDOpcode, Op0, Op1);
|
2008-08-20 08:11:48 +08:00
|
|
|
if (ResultReg == 0)
|
|
|
|
// Target-specific code wasn't able to find a machine opcode for
|
|
|
|
// the given ISD opcode and type. Halt "fast" selection and bail.
|
|
|
|
return false;
|
|
|
|
|
2008-08-20 08:23:20 +08:00
|
|
|
// We successfully emitted code for the given LLVM Instruction.
|
2008-08-20 08:11:48 +08:00
|
|
|
ValueMap[I] = ResultReg;
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
bool FastISel::SelectGetElementPtr(Instruction *I,
|
|
|
|
DenseMap<const Value*, unsigned> &ValueMap) {
|
2008-08-28 02:10:19 +08:00
|
|
|
unsigned N = getRegForValue(I->getOperand(0), ValueMap);
|
2008-08-21 06:45:34 +08:00
|
|
|
if (N == 0)
|
|
|
|
// Unhandled operand. Halt "fast" selection and bail.
|
|
|
|
return false;
|
|
|
|
|
|
|
|
const Type *Ty = I->getOperand(0)->getType();
|
2008-08-22 01:25:26 +08:00
|
|
|
MVT::SimpleValueType VT = TLI.getPointerTy().getSimpleVT();
|
2008-08-21 06:45:34 +08:00
|
|
|
for (GetElementPtrInst::op_iterator OI = I->op_begin()+1, E = I->op_end();
|
|
|
|
OI != E; ++OI) {
|
|
|
|
Value *Idx = *OI;
|
|
|
|
if (const StructType *StTy = dyn_cast<StructType>(Ty)) {
|
|
|
|
unsigned Field = cast<ConstantInt>(Idx)->getZExtValue();
|
|
|
|
if (Field) {
|
|
|
|
// N = N + Offset
|
|
|
|
uint64_t Offs = TD.getStructLayout(StTy)->getElementOffset(Field);
|
|
|
|
// FIXME: This can be optimized by combining the add with a
|
|
|
|
// subsequent one.
|
2008-08-22 01:25:26 +08:00
|
|
|
N = FastEmit_ri_(VT, ISD::ADD, N, Offs, VT);
|
2008-08-21 06:45:34 +08:00
|
|
|
if (N == 0)
|
|
|
|
// Unhandled operand. Halt "fast" selection and bail.
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
Ty = StTy->getElementType(Field);
|
|
|
|
} else {
|
|
|
|
Ty = cast<SequentialType>(Ty)->getElementType();
|
|
|
|
|
|
|
|
// If this is a constant subscript, handle it quickly.
|
|
|
|
if (ConstantInt *CI = dyn_cast<ConstantInt>(Idx)) {
|
|
|
|
if (CI->getZExtValue() == 0) continue;
|
|
|
|
uint64_t Offs =
|
|
|
|
TD.getABITypeSize(Ty)*cast<ConstantInt>(CI)->getSExtValue();
|
2008-08-22 01:25:26 +08:00
|
|
|
N = FastEmit_ri_(VT, ISD::ADD, N, Offs, VT);
|
2008-08-21 06:45:34 +08:00
|
|
|
if (N == 0)
|
|
|
|
// Unhandled operand. Halt "fast" selection and bail.
|
|
|
|
return false;
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
|
|
|
|
// N = N + Idx * ElementSize;
|
|
|
|
uint64_t ElementSize = TD.getABITypeSize(Ty);
|
2008-08-28 02:10:19 +08:00
|
|
|
unsigned IdxN = getRegForValue(Idx, ValueMap);
|
2008-08-21 06:45:34 +08:00
|
|
|
if (IdxN == 0)
|
|
|
|
// Unhandled operand. Halt "fast" selection and bail.
|
|
|
|
return false;
|
|
|
|
|
|
|
|
// If the index is smaller or larger than intptr_t, truncate or extend
|
|
|
|
// it.
|
2008-08-21 09:19:11 +08:00
|
|
|
MVT IdxVT = MVT::getMVT(Idx->getType(), /*HandleUnknown=*/false);
|
2008-08-21 06:45:34 +08:00
|
|
|
if (IdxVT.bitsLT(VT))
|
2008-08-27 04:57:08 +08:00
|
|
|
IdxN = FastEmit_r(IdxVT.getSimpleVT(), VT, ISD::SIGN_EXTEND, IdxN);
|
2008-08-21 06:45:34 +08:00
|
|
|
else if (IdxVT.bitsGT(VT))
|
2008-08-27 04:57:08 +08:00
|
|
|
IdxN = FastEmit_r(IdxVT.getSimpleVT(), VT, ISD::TRUNCATE, IdxN);
|
2008-08-21 06:45:34 +08:00
|
|
|
if (IdxN == 0)
|
|
|
|
// Unhandled operand. Halt "fast" selection and bail.
|
|
|
|
return false;
|
|
|
|
|
2008-08-27 04:57:08 +08:00
|
|
|
if (ElementSize != 1) {
|
2008-08-22 01:37:05 +08:00
|
|
|
IdxN = FastEmit_ri_(VT, ISD::MUL, IdxN, ElementSize, VT);
|
2008-08-27 04:57:08 +08:00
|
|
|
if (IdxN == 0)
|
|
|
|
// Unhandled operand. Halt "fast" selection and bail.
|
|
|
|
return false;
|
|
|
|
}
|
2008-08-26 07:58:18 +08:00
|
|
|
N = FastEmit_rr(VT, VT, ISD::ADD, N, IdxN);
|
2008-08-21 06:45:34 +08:00
|
|
|
if (N == 0)
|
|
|
|
// Unhandled operand. Halt "fast" selection and bail.
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// We successfully emitted code for the given LLVM Instruction.
|
|
|
|
ValueMap[I] = N;
|
|
|
|
return true;
|
2008-08-20 08:11:48 +08:00
|
|
|
}
|
|
|
|
|
2008-08-27 07:46:32 +08:00
|
|
|
bool FastISel::SelectCast(Instruction *I, ISD::NodeType Opcode,
|
|
|
|
DenseMap<const Value*, unsigned> &ValueMap) {
|
|
|
|
MVT SrcVT = MVT::getMVT(I->getOperand(0)->getType());
|
|
|
|
MVT DstVT = MVT::getMVT(I->getType());
|
|
|
|
|
|
|
|
if (SrcVT == MVT::Other || !SrcVT.isSimple() ||
|
|
|
|
DstVT == MVT::Other || !DstVT.isSimple() ||
|
|
|
|
!TLI.isTypeLegal(SrcVT) || !TLI.isTypeLegal(DstVT))
|
|
|
|
// Unhandled type. Halt "fast" selection and bail.
|
|
|
|
return false;
|
|
|
|
|
2008-08-28 02:10:19 +08:00
|
|
|
unsigned InputReg = getRegForValue(I->getOperand(0), ValueMap);
|
2008-08-27 07:46:32 +08:00
|
|
|
if (!InputReg)
|
|
|
|
// Unhandled operand. Halt "fast" selection and bail.
|
|
|
|
return false;
|
|
|
|
|
|
|
|
unsigned ResultReg = FastEmit_r(SrcVT.getSimpleVT(),
|
|
|
|
DstVT.getSimpleVT(),
|
|
|
|
Opcode,
|
|
|
|
InputReg);
|
|
|
|
if (!ResultReg)
|
|
|
|
return false;
|
|
|
|
|
|
|
|
ValueMap[I] = ResultReg;
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
2008-08-28 02:10:19 +08:00
|
|
|
bool FastISel::SelectBitCast(Instruction *I,
|
|
|
|
DenseMap<const Value*, unsigned> &ValueMap) {
|
|
|
|
// If the bitcast doesn't change the type, just use the operand value.
|
|
|
|
if (I->getType() == I->getOperand(0)->getType()) {
|
|
|
|
ValueMap[I] = getRegForValue(I->getOperand(0), ValueMap);
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
// Bitcasts of other values become reg-reg copies or BIT_CONVERT operators.
|
|
|
|
MVT SrcVT = MVT::getMVT(I->getOperand(0)->getType());
|
2008-08-27 07:46:32 +08:00
|
|
|
MVT DstVT = MVT::getMVT(I->getType());
|
|
|
|
|
|
|
|
if (SrcVT == MVT::Other || !SrcVT.isSimple() ||
|
|
|
|
DstVT == MVT::Other || !DstVT.isSimple() ||
|
|
|
|
!TLI.isTypeLegal(SrcVT) || !TLI.isTypeLegal(DstVT))
|
|
|
|
// Unhandled type. Halt "fast" selection and bail.
|
|
|
|
return false;
|
|
|
|
|
2008-08-28 02:10:19 +08:00
|
|
|
unsigned Op0 = getRegForValue(I->getOperand(0), ValueMap);
|
|
|
|
if (Op0 == 0)
|
|
|
|
// Unhandled operand. Halt "fast" selection and bail.
|
2008-08-27 07:46:32 +08:00
|
|
|
return false;
|
|
|
|
|
2008-08-28 02:10:19 +08:00
|
|
|
// First, try to perform the bitcast by inserting a reg-reg copy.
|
|
|
|
unsigned ResultReg = 0;
|
|
|
|
if (SrcVT.getSimpleVT() == DstVT.getSimpleVT()) {
|
|
|
|
TargetRegisterClass* SrcClass = TLI.getRegClassFor(SrcVT);
|
|
|
|
TargetRegisterClass* DstClass = TLI.getRegClassFor(DstVT);
|
|
|
|
ResultReg = createResultReg(DstClass);
|
|
|
|
|
|
|
|
bool InsertedCopy = TII.copyRegToReg(*MBB, MBB->end(), ResultReg,
|
|
|
|
Op0, DstClass, SrcClass);
|
|
|
|
if (!InsertedCopy)
|
|
|
|
ResultReg = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
// If the reg-reg copy failed, select a BIT_CONVERT opcode.
|
|
|
|
if (!ResultReg)
|
|
|
|
ResultReg = FastEmit_r(SrcVT.getSimpleVT(), DstVT.getSimpleVT(),
|
|
|
|
ISD::BIT_CONVERT, Op0);
|
|
|
|
|
|
|
|
if (!ResultReg)
|
2008-08-27 07:46:32 +08:00
|
|
|
return false;
|
|
|
|
|
2008-08-28 02:10:19 +08:00
|
|
|
ValueMap[I] = ResultReg;
|
2008-08-27 07:46:32 +08:00
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
2008-08-14 04:19:35 +08:00
|
|
|
BasicBlock::iterator
|
2008-08-21 02:09:02 +08:00
|
|
|
FastISel::SelectInstructions(BasicBlock::iterator Begin,
|
|
|
|
BasicBlock::iterator End,
|
2008-08-21 05:05:57 +08:00
|
|
|
DenseMap<const Value*, unsigned> &ValueMap,
|
2008-08-23 10:44:46 +08:00
|
|
|
DenseMap<const BasicBlock*,
|
2008-08-23 05:28:19 +08:00
|
|
|
MachineBasicBlock *> &MBBMap,
|
2008-08-21 05:05:57 +08:00
|
|
|
MachineBasicBlock *mbb) {
|
|
|
|
MBB = mbb;
|
2008-08-14 04:19:35 +08:00
|
|
|
BasicBlock::iterator I = Begin;
|
|
|
|
|
|
|
|
for (; I != End; ++I) {
|
|
|
|
switch (I->getOpcode()) {
|
2008-08-20 08:23:20 +08:00
|
|
|
case Instruction::Add: {
|
|
|
|
ISD::NodeType Opc = I->getType()->isFPOrFPVector() ? ISD::FADD : ISD::ADD;
|
|
|
|
if (!SelectBinaryOp(I, Opc, ValueMap)) return I; break;
|
|
|
|
}
|
|
|
|
case Instruction::Sub: {
|
|
|
|
ISD::NodeType Opc = I->getType()->isFPOrFPVector() ? ISD::FSUB : ISD::SUB;
|
|
|
|
if (!SelectBinaryOp(I, Opc, ValueMap)) return I; break;
|
|
|
|
}
|
|
|
|
case Instruction::Mul: {
|
|
|
|
ISD::NodeType Opc = I->getType()->isFPOrFPVector() ? ISD::FMUL : ISD::MUL;
|
|
|
|
if (!SelectBinaryOp(I, Opc, ValueMap)) return I; break;
|
|
|
|
}
|
2008-08-20 08:11:48 +08:00
|
|
|
case Instruction::SDiv:
|
|
|
|
if (!SelectBinaryOp(I, ISD::SDIV, ValueMap)) return I; break;
|
|
|
|
case Instruction::UDiv:
|
|
|
|
if (!SelectBinaryOp(I, ISD::UDIV, ValueMap)) return I; break;
|
|
|
|
case Instruction::FDiv:
|
|
|
|
if (!SelectBinaryOp(I, ISD::FDIV, ValueMap)) return I; break;
|
|
|
|
case Instruction::SRem:
|
|
|
|
if (!SelectBinaryOp(I, ISD::SREM, ValueMap)) return I; break;
|
|
|
|
case Instruction::URem:
|
|
|
|
if (!SelectBinaryOp(I, ISD::UREM, ValueMap)) return I; break;
|
|
|
|
case Instruction::FRem:
|
|
|
|
if (!SelectBinaryOp(I, ISD::FREM, ValueMap)) return I; break;
|
|
|
|
case Instruction::Shl:
|
|
|
|
if (!SelectBinaryOp(I, ISD::SHL, ValueMap)) return I; break;
|
|
|
|
case Instruction::LShr:
|
|
|
|
if (!SelectBinaryOp(I, ISD::SRL, ValueMap)) return I; break;
|
|
|
|
case Instruction::AShr:
|
|
|
|
if (!SelectBinaryOp(I, ISD::SRA, ValueMap)) return I; break;
|
|
|
|
case Instruction::And:
|
|
|
|
if (!SelectBinaryOp(I, ISD::AND, ValueMap)) return I; break;
|
|
|
|
case Instruction::Or:
|
|
|
|
if (!SelectBinaryOp(I, ISD::OR, ValueMap)) return I; break;
|
|
|
|
case Instruction::Xor:
|
|
|
|
if (!SelectBinaryOp(I, ISD::XOR, ValueMap)) return I; break;
|
|
|
|
|
|
|
|
case Instruction::GetElementPtr:
|
|
|
|
if (!SelectGetElementPtr(I, ValueMap)) return I;
|
2008-08-14 04:19:35 +08:00
|
|
|
break;
|
2008-08-20 08:11:48 +08:00
|
|
|
|
2008-08-20 06:31:46 +08:00
|
|
|
case Instruction::Br: {
|
|
|
|
BranchInst *BI = cast<BranchInst>(I);
|
|
|
|
|
2008-08-20 09:17:01 +08:00
|
|
|
if (BI->isUnconditional()) {
|
2008-08-23 05:28:19 +08:00
|
|
|
MachineFunction::iterator NextMBB =
|
2008-08-20 09:17:01 +08:00
|
|
|
next(MachineFunction::iterator(MBB));
|
2008-08-23 05:28:19 +08:00
|
|
|
BasicBlock *LLVMSucc = BI->getSuccessor(0);
|
|
|
|
MachineBasicBlock *MSucc = MBBMap[LLVMSucc];
|
|
|
|
|
|
|
|
if (NextMBB != MF.end() && MSucc == NextMBB) {
|
|
|
|
// The unconditional fall-through case, which needs no instructions.
|
|
|
|
} else {
|
|
|
|
// The unconditional branch case.
|
|
|
|
TII.InsertBranch(*MBB, MSucc, NULL, SmallVector<MachineOperand, 0>());
|
2008-08-20 09:17:01 +08:00
|
|
|
}
|
2008-08-23 05:28:19 +08:00
|
|
|
MBB->addSuccessor(MSucc);
|
|
|
|
break;
|
2008-08-20 06:31:46 +08:00
|
|
|
}
|
|
|
|
|
2008-08-23 05:28:19 +08:00
|
|
|
// Conditional branches are not handed yet.
|
|
|
|
// Halt "fast" selection and bail.
|
2008-08-20 06:31:46 +08:00
|
|
|
return I;
|
|
|
|
}
|
2008-08-23 01:37:48 +08:00
|
|
|
|
|
|
|
case Instruction::PHI:
|
|
|
|
// PHI nodes are already emitted.
|
|
|
|
break;
|
2008-08-26 04:20:32 +08:00
|
|
|
|
|
|
|
case Instruction::BitCast:
|
2008-08-27 07:46:32 +08:00
|
|
|
if (!SelectBitCast(I, ValueMap)) return I; break;
|
2008-08-27 01:44:42 +08:00
|
|
|
|
|
|
|
case Instruction::FPToSI:
|
2008-08-28 02:10:19 +08:00
|
|
|
if (!SelectCast(I, ISD::FP_TO_SINT, ValueMap)) return I;
|
2008-08-27 07:46:32 +08:00
|
|
|
break;
|
2008-08-27 07:14:49 +08:00
|
|
|
case Instruction::ZExt:
|
2008-08-28 02:10:19 +08:00
|
|
|
if (!SelectCast(I, ISD::ZERO_EXTEND, ValueMap)) return I;
|
2008-08-27 07:46:32 +08:00
|
|
|
break;
|
|
|
|
case Instruction::SExt:
|
2008-08-28 02:10:19 +08:00
|
|
|
if (!SelectCast(I, ISD::SIGN_EXTEND, ValueMap)) return I;
|
2008-08-27 07:46:32 +08:00
|
|
|
break;
|
2008-08-27 04:37:00 +08:00
|
|
|
case Instruction::SIToFP:
|
2008-08-28 02:10:19 +08:00
|
|
|
if (!SelectCast(I, ISD::SINT_TO_FP, ValueMap)) return I;
|
2008-08-27 07:46:32 +08:00
|
|
|
break;
|
2008-08-27 05:28:54 +08:00
|
|
|
|
2008-08-27 08:31:01 +08:00
|
|
|
case Instruction::IntToPtr: // Deliberate fall-through.
|
|
|
|
case Instruction::PtrToInt: {
|
|
|
|
MVT SrcVT = TLI.getValueType(I->getOperand(0)->getType());
|
|
|
|
MVT DstVT = TLI.getValueType(I->getType());
|
|
|
|
if (SrcVT.getSimpleVT() == DstVT.getSimpleVT()) {
|
2008-08-27 08:35:37 +08:00
|
|
|
if (ValueMap[I->getOperand(0)]) {
|
|
|
|
ValueMap[I] = ValueMap[I->getOperand(0)];
|
|
|
|
break;
|
|
|
|
} else
|
|
|
|
// Unhandled operand
|
|
|
|
return I;
|
2008-08-27 08:31:01 +08:00
|
|
|
} else if (DstVT.bitsGT(SrcVT)) {
|
2008-08-28 02:10:19 +08:00
|
|
|
if (!SelectCast(I, ISD::ZERO_EXTEND, ValueMap)) return I;
|
2008-08-27 08:31:01 +08:00
|
|
|
break;
|
|
|
|
} else {
|
|
|
|
// TODO: Handle SrcVT > DstVT, where truncation is needed.
|
|
|
|
return I;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2008-08-14 04:19:35 +08:00
|
|
|
default:
|
|
|
|
// Unhandled instruction. Halt "fast" selection and bail.
|
|
|
|
return I;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return I;
|
|
|
|
}
|
|
|
|
|
2008-08-21 05:05:57 +08:00
|
|
|
FastISel::FastISel(MachineFunction &mf)
|
2008-08-22 08:20:26 +08:00
|
|
|
: MF(mf),
|
|
|
|
MRI(mf.getRegInfo()),
|
|
|
|
TM(mf.getTarget()),
|
|
|
|
TD(*TM.getTargetData()),
|
|
|
|
TII(*TM.getInstrInfo()),
|
|
|
|
TLI(*TM.getTargetLowering()) {
|
2008-08-21 05:05:57 +08:00
|
|
|
}
|
|
|
|
|
2008-08-15 05:51:29 +08:00
|
|
|
FastISel::~FastISel() {}
|
|
|
|
|
2008-08-26 07:58:18 +08:00
|
|
|
unsigned FastISel::FastEmit_(MVT::SimpleValueType, MVT::SimpleValueType, ISD::NodeType) {
|
2008-08-14 04:19:35 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-08-26 07:58:18 +08:00
|
|
|
unsigned FastISel::FastEmit_r(MVT::SimpleValueType, MVT::SimpleValueType,
|
|
|
|
ISD::NodeType, unsigned /*Op0*/) {
|
2008-08-14 04:19:35 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-08-26 07:58:18 +08:00
|
|
|
unsigned FastISel::FastEmit_rr(MVT::SimpleValueType, MVT::SimpleValueType,
|
|
|
|
ISD::NodeType, unsigned /*Op0*/,
|
|
|
|
unsigned /*Op0*/) {
|
2008-08-14 04:19:35 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-08-26 07:58:18 +08:00
|
|
|
unsigned FastISel::FastEmit_i(MVT::SimpleValueType, MVT::SimpleValueType,
|
|
|
|
ISD::NodeType, uint64_t /*Imm*/) {
|
2008-08-21 06:45:34 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-08-27 09:09:54 +08:00
|
|
|
unsigned FastISel::FastEmit_f(MVT::SimpleValueType, MVT::SimpleValueType,
|
|
|
|
ISD::NodeType, ConstantFP * /*FPImm*/) {
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-08-26 07:58:18 +08:00
|
|
|
unsigned FastISel::FastEmit_ri(MVT::SimpleValueType, MVT::SimpleValueType,
|
|
|
|
ISD::NodeType, unsigned /*Op0*/,
|
|
|
|
uint64_t /*Imm*/) {
|
2008-08-21 09:41:07 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-08-27 09:09:54 +08:00
|
|
|
unsigned FastISel::FastEmit_rf(MVT::SimpleValueType, MVT::SimpleValueType,
|
|
|
|
ISD::NodeType, unsigned /*Op0*/,
|
|
|
|
ConstantFP * /*FPImm*/) {
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-08-26 07:58:18 +08:00
|
|
|
unsigned FastISel::FastEmit_rri(MVT::SimpleValueType, MVT::SimpleValueType,
|
|
|
|
ISD::NodeType,
|
2008-08-21 09:41:07 +08:00
|
|
|
unsigned /*Op0*/, unsigned /*Op1*/,
|
|
|
|
uint64_t /*Imm*/) {
|
2008-08-21 06:45:34 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/// FastEmit_ri_ - This method is a wrapper of FastEmit_ri. It first tries
|
|
|
|
/// to emit an instruction with an immediate operand using FastEmit_ri.
|
|
|
|
/// If that fails, it materializes the immediate into a register and try
|
|
|
|
/// FastEmit_rr instead.
|
|
|
|
unsigned FastISel::FastEmit_ri_(MVT::SimpleValueType VT, ISD::NodeType Opcode,
|
2008-08-21 09:41:07 +08:00
|
|
|
unsigned Op0, uint64_t Imm,
|
|
|
|
MVT::SimpleValueType ImmType) {
|
2008-08-21 06:45:34 +08:00
|
|
|
unsigned ResultReg = 0;
|
|
|
|
// First check if immediate type is legal. If not, we can't use the ri form.
|
|
|
|
if (TLI.getOperationAction(ISD::Constant, ImmType) == TargetLowering::Legal)
|
2008-08-26 07:58:18 +08:00
|
|
|
ResultReg = FastEmit_ri(VT, VT, Opcode, Op0, Imm);
|
2008-08-21 06:45:34 +08:00
|
|
|
if (ResultReg != 0)
|
|
|
|
return ResultReg;
|
2008-08-26 07:58:18 +08:00
|
|
|
unsigned MaterialReg = FastEmit_i(ImmType, ImmType, ISD::Constant, Imm);
|
2008-08-21 09:41:07 +08:00
|
|
|
if (MaterialReg == 0)
|
|
|
|
return 0;
|
2008-08-26 07:58:18 +08:00
|
|
|
return FastEmit_rr(VT, VT, Opcode, Op0, MaterialReg);
|
2008-08-21 09:41:07 +08:00
|
|
|
}
|
|
|
|
|
2008-08-27 09:09:54 +08:00
|
|
|
/// FastEmit_rf_ - This method is a wrapper of FastEmit_ri. It first tries
|
|
|
|
/// to emit an instruction with a floating-point immediate operand using
|
|
|
|
/// FastEmit_rf. If that fails, it materializes the immediate into a register
|
|
|
|
/// and try FastEmit_rr instead.
|
|
|
|
unsigned FastISel::FastEmit_rf_(MVT::SimpleValueType VT, ISD::NodeType Opcode,
|
|
|
|
unsigned Op0, ConstantFP *FPImm,
|
|
|
|
MVT::SimpleValueType ImmType) {
|
|
|
|
unsigned ResultReg = 0;
|
|
|
|
// First check if immediate type is legal. If not, we can't use the rf form.
|
|
|
|
if (TLI.getOperationAction(ISD::Constant, ImmType) == TargetLowering::Legal)
|
|
|
|
ResultReg = FastEmit_rf(VT, VT, Opcode, Op0, FPImm);
|
|
|
|
if (ResultReg != 0)
|
|
|
|
return ResultReg;
|
|
|
|
|
|
|
|
// Materialize the constant in a register.
|
|
|
|
unsigned MaterialReg = FastEmit_f(ImmType, ImmType, ISD::ConstantFP, FPImm);
|
|
|
|
if (MaterialReg == 0) {
|
2008-08-28 02:01:42 +08:00
|
|
|
// If the target doesn't have a way to directly enter a floating-point
|
|
|
|
// value into a register, use an alternate approach.
|
|
|
|
// TODO: The current approach only supports floating-point constants
|
|
|
|
// that can be constructed by conversion from integer values. This should
|
|
|
|
// be replaced by code that creates a load from a constant-pool entry,
|
|
|
|
// which will require some target-specific work.
|
2008-08-27 09:09:54 +08:00
|
|
|
const APFloat &Flt = FPImm->getValueAPF();
|
|
|
|
MVT IntVT = TLI.getPointerTy();
|
|
|
|
|
|
|
|
uint64_t x[2];
|
|
|
|
uint32_t IntBitWidth = IntVT.getSizeInBits();
|
|
|
|
if (Flt.convertToInteger(x, IntBitWidth, /*isSigned=*/true,
|
|
|
|
APFloat::rmTowardZero) != APFloat::opOK)
|
|
|
|
return 0;
|
|
|
|
APInt IntVal(IntBitWidth, 2, x);
|
|
|
|
|
|
|
|
unsigned IntegerReg = FastEmit_i(IntVT.getSimpleVT(), IntVT.getSimpleVT(),
|
|
|
|
ISD::Constant, IntVal.getZExtValue());
|
|
|
|
if (IntegerReg == 0)
|
|
|
|
return 0;
|
|
|
|
MaterialReg = FastEmit_r(IntVT.getSimpleVT(), VT,
|
|
|
|
ISD::SINT_TO_FP, IntegerReg);
|
|
|
|
if (MaterialReg == 0)
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
return FastEmit_rr(VT, VT, Opcode, Op0, MaterialReg);
|
|
|
|
}
|
|
|
|
|
2008-08-21 09:41:07 +08:00
|
|
|
unsigned FastISel::createResultReg(const TargetRegisterClass* RC) {
|
|
|
|
return MRI.createVirtualRegister(RC);
|
2008-08-21 06:45:34 +08:00
|
|
|
}
|
|
|
|
|
2008-08-14 04:19:35 +08:00
|
|
|
unsigned FastISel::FastEmitInst_(unsigned MachineInstOpcode,
|
2008-08-21 02:09:38 +08:00
|
|
|
const TargetRegisterClass* RC) {
|
2008-08-21 09:41:07 +08:00
|
|
|
unsigned ResultReg = createResultReg(RC);
|
2008-08-21 05:05:57 +08:00
|
|
|
const TargetInstrDesc &II = TII.get(MachineInstOpcode);
|
2008-08-14 04:19:35 +08:00
|
|
|
|
2008-08-21 07:53:10 +08:00
|
|
|
BuildMI(MBB, II, ResultReg);
|
2008-08-14 04:19:35 +08:00
|
|
|
return ResultReg;
|
|
|
|
}
|
|
|
|
|
|
|
|
unsigned FastISel::FastEmitInst_r(unsigned MachineInstOpcode,
|
|
|
|
const TargetRegisterClass *RC,
|
|
|
|
unsigned Op0) {
|
2008-08-21 09:41:07 +08:00
|
|
|
unsigned ResultReg = createResultReg(RC);
|
2008-08-21 05:05:57 +08:00
|
|
|
const TargetInstrDesc &II = TII.get(MachineInstOpcode);
|
2008-08-14 04:19:35 +08:00
|
|
|
|
2008-08-21 07:53:10 +08:00
|
|
|
BuildMI(MBB, II, ResultReg).addReg(Op0);
|
2008-08-14 04:19:35 +08:00
|
|
|
return ResultReg;
|
|
|
|
}
|
|
|
|
|
|
|
|
unsigned FastISel::FastEmitInst_rr(unsigned MachineInstOpcode,
|
|
|
|
const TargetRegisterClass *RC,
|
|
|
|
unsigned Op0, unsigned Op1) {
|
2008-08-21 09:41:07 +08:00
|
|
|
unsigned ResultReg = createResultReg(RC);
|
2008-08-21 05:05:57 +08:00
|
|
|
const TargetInstrDesc &II = TII.get(MachineInstOpcode);
|
2008-08-14 04:19:35 +08:00
|
|
|
|
2008-08-21 07:53:10 +08:00
|
|
|
BuildMI(MBB, II, ResultReg).addReg(Op0).addReg(Op1);
|
2008-08-14 04:19:35 +08:00
|
|
|
return ResultReg;
|
|
|
|
}
|
2008-08-21 09:41:07 +08:00
|
|
|
|
|
|
|
unsigned FastISel::FastEmitInst_ri(unsigned MachineInstOpcode,
|
|
|
|
const TargetRegisterClass *RC,
|
|
|
|
unsigned Op0, uint64_t Imm) {
|
|
|
|
unsigned ResultReg = createResultReg(RC);
|
|
|
|
const TargetInstrDesc &II = TII.get(MachineInstOpcode);
|
|
|
|
|
|
|
|
BuildMI(MBB, II, ResultReg).addReg(Op0).addImm(Imm);
|
|
|
|
return ResultReg;
|
|
|
|
}
|
|
|
|
|
2008-08-27 09:09:54 +08:00
|
|
|
unsigned FastISel::FastEmitInst_rf(unsigned MachineInstOpcode,
|
|
|
|
const TargetRegisterClass *RC,
|
|
|
|
unsigned Op0, ConstantFP *FPImm) {
|
|
|
|
unsigned ResultReg = createResultReg(RC);
|
|
|
|
const TargetInstrDesc &II = TII.get(MachineInstOpcode);
|
|
|
|
|
|
|
|
BuildMI(MBB, II, ResultReg).addReg(Op0).addFPImm(FPImm);
|
|
|
|
return ResultReg;
|
|
|
|
}
|
|
|
|
|
2008-08-21 09:41:07 +08:00
|
|
|
unsigned FastISel::FastEmitInst_rri(unsigned MachineInstOpcode,
|
|
|
|
const TargetRegisterClass *RC,
|
|
|
|
unsigned Op0, unsigned Op1, uint64_t Imm) {
|
|
|
|
unsigned ResultReg = createResultReg(RC);
|
|
|
|
const TargetInstrDesc &II = TII.get(MachineInstOpcode);
|
|
|
|
|
|
|
|
BuildMI(MBB, II, ResultReg).addReg(Op0).addReg(Op1).addImm(Imm);
|
|
|
|
return ResultReg;
|
|
|
|
}
|
2008-08-26 04:20:32 +08:00
|
|
|
|
|
|
|
unsigned FastISel::FastEmitInst_i(unsigned MachineInstOpcode,
|
|
|
|
const TargetRegisterClass *RC,
|
|
|
|
uint64_t Imm) {
|
|
|
|
unsigned ResultReg = createResultReg(RC);
|
|
|
|
const TargetInstrDesc &II = TII.get(MachineInstOpcode);
|
|
|
|
|
|
|
|
BuildMI(MBB, II, ResultReg).addImm(Imm);
|
|
|
|
return ResultReg;
|
2008-08-26 06:20:39 +08:00
|
|
|
}
|