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Minor refactoring of CC Lowering interfaces 

llvm-svn: 34656
This commit is contained in:
Chris Lattner 2007-02-27 05:13:54 +00:00
parent dc3adc83e7
commit 9f059194a7
3 changed files with 107 additions and 78 deletions
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134
llvm/include/llvm/CodeGen/CallingConvLower.h
View File

@ -20,62 +20,8 @@
namespace llvm {
class MRegisterInfo;
class TargetMachine;
/// CCState - This class holds information needed while lowering arguments and
/// return values. It captures which registers are already assigned and which
/// stack slots are used. It provides accessors to allocate these values.
class CCState {
unsigned StackOffset;
const MRegisterInfo &MRI;
SmallVector<uint32_t, 16> UsedRegs;
public:
CCState(const MRegisterInfo &mri);
unsigned getNextStackOffset() const { return StackOffset; }
/// isAllocated - Return true if the specified register (or an alias) is
/// allocated.
bool isAllocated(unsigned Reg) const {
return UsedRegs[Reg/32] & (1 << (Reg&31));
}
/// getFirstUnallocated - Return the first unallocated register in the set, or
/// NumRegs if they are all allocated.
unsigned getFirstUnallocated(const unsigned *Regs, unsigned NumRegs) const {
for (unsigned i = 0; i != NumRegs; ++i)
if (!isAllocated(Regs[i]))
return i;
return NumRegs;
}
/// AllocateReg - Attempt to allocate one of the specified registers. If none
/// are available, return zero. Otherwise, return the first one available,
/// marking it and any aliases as allocated.
unsigned AllocateReg(const unsigned *Regs, unsigned NumRegs) {
unsigned FirstUnalloc = getFirstUnallocated(Regs, NumRegs);
if (FirstUnalloc == NumRegs)
return 0; // Didn't find the reg.
// Mark the register and any aliases as allocated.
unsigned Reg = Regs[FirstUnalloc];
MarkAllocated(Reg);
return Reg;
}
/// AllocateStack - Allocate a chunk of stack space with the specified size
/// and alignment.
unsigned AllocateStack(unsigned Size, unsigned Align) {
assert(Align && ((Align-1) & Align) == 0); // Align is power of 2.
StackOffset = ((StackOffset + Align-1) & ~(Align-1));
unsigned Result = StackOffset;
StackOffset += Size;
return Result;
}
private:
/// MarkAllocated - Mark a register and all of its aliases as allocated.
void MarkAllocated(unsigned Reg);
};
/// CCValAssign - Represent assignment of one arg/retval to a location.
class CCValAssign {
public:
@ -144,6 +90,84 @@ public:
LocInfo getLocInfo() const { return HTP; }
};
/// CCState - This class holds information needed while lowering arguments and
/// return values. It captures which registers are already assigned and which
/// stack slots are used. It provides accessors to allocate these values.
class CCState {
unsigned CallingConv;
const TargetMachine &TM;
const MRegisterInfo &MRI;
SmallVector<CCValAssign, 16> &Locs;
unsigned StackOffset;
SmallVector<uint32_t, 16> UsedRegs;
public:
CCState(unsigned CC, const TargetMachine &TM,
SmallVector<CCValAssign, 16> &locs);
void addLoc(const CCValAssign &V) {
Locs.push_back(V);
}
const TargetMachine &getTarget() const { return TM; }
unsigned getCallingConv() const { return CallingConv; }
unsigned getNextStackOffset() const { return StackOffset; }
/// isAllocated - Return true if the specified register (or an alias) is
/// allocated.
bool isAllocated(unsigned Reg) const {
return UsedRegs[Reg/32] & (1 << (Reg&31));
}
/// getFirstUnallocated - Return the first unallocated register in the set, or
/// NumRegs if they are all allocated.
unsigned getFirstUnallocated(const unsigned *Regs, unsigned NumRegs) const {
for (unsigned i = 0; i != NumRegs; ++i)
if (!isAllocated(Regs[i]))
return i;
return NumRegs;
}
/// AllocateReg - Attempt to allocate one register. If it is not available,
/// return zero. Otherwise, return the register, marking it and any aliases
/// as allocated.
unsigned AllocateReg(unsigned Reg) {
if (isAllocated(Reg)) return 0;
MarkAllocated(Reg);
return Reg;
}
/// AllocateReg - Attempt to allocate one of the specified registers. If none
/// are available, return zero. Otherwise, return the first one available,
/// marking it and any aliases as allocated.
unsigned AllocateReg(const unsigned *Regs, unsigned NumRegs) {
unsigned FirstUnalloc = getFirstUnallocated(Regs, NumRegs);
if (FirstUnalloc == NumRegs)
return 0; // Didn't find the reg.
// Mark the register and any aliases as allocated.
unsigned Reg = Regs[FirstUnalloc];
MarkAllocated(Reg);
return Reg;
}
/// AllocateStack - Allocate a chunk of stack space with the specified size
/// and alignment.
unsigned AllocateStack(unsigned Size, unsigned Align) {
assert(Align && ((Align-1) & Align) == 0); // Align is power of 2.
StackOffset = ((StackOffset + Align-1) & ~(Align-1));
unsigned Result = StackOffset;
StackOffset += Size;
return Result;
}
private:
/// MarkAllocated - Mark a register and all of its aliases as allocated.
void MarkAllocated(unsigned Reg);
};
} // end namespace llvm
#endif

5
llvm/lib/CodeGen/SelectionDAG/CallingConvLower.cpp
View File

@ -14,9 +14,12 @@
#include "llvm/CodeGen/CallingConvLower.h"
#include "llvm/Target/MRegisterInfo.h"
#include "llvm/Target/TargetMachine.h"
using namespace llvm;
CCState::CCState(const MRegisterInfo &mri) : MRI(mri) {
CCState::CCState(unsigned CC, const TargetMachine &tm,
SmallVector<CCValAssign, 16> &locs)
: CallingConv(CC), TM(tm), MRI(*TM.getRegisterInfo()), Locs(locs) {
// No stack is used.
StackOffset = 0;

46
llvm/lib/Target/X86/X86ISelLowering.cpp
View File

@ -429,6 +429,7 @@ X86TargetLowering::X86TargetLowering(TargetMachine &TM)
// Return Value Calling Convention Implementation
//===----------------------------------------------------------------------===//
/// GetRetValueLocs - If we are returning a set of values with the specified
/// value types, determine the set of registers each one will land in. This
/// sets one element of the ResultRegs array for each element in the VTs array.
@ -1060,11 +1061,11 @@ SDOperand X86TargetLowering::LowerCCCCallTo(SDOperand Op, SelectionDAG &DAG,
//===----------------------------------------------------------------------===//
/// X86_64_CCC_AssignArgument - Implement the X86-64 C Calling Convention.
static void X86_64_CCC_AssignArgument(unsigned ValNo,
/// X86_64_CCC_AssignArgument - Implement the X86-64 C Calling Convention. This
/// returns true if the value was not handled by this calling convention.
static bool X86_64_CCC_AssignArgument(unsigned ValNo,
MVT::ValueType ArgVT, unsigned ArgFlags,
CCState &State,
SmallVector<CCValAssign, 16> &Locs) {
CCState &State) {
MVT::ValueType LocVT = ArgVT;
CCValAssign::LocInfo LocInfo = CCValAssign::Full;
@ -1082,8 +1083,8 @@ static void X86_64_CCC_AssignArgument(unsigned ValNo,
X86::EDI, X86::ESI, X86::EDX, X86::ECX, X86::R8D, X86::R9D
};
if (unsigned Reg = State.AllocateReg(GPR32ArgRegs, 6)) {
Locs.push_back(CCValAssign::getReg(ValNo, ArgVT, Reg, LocVT, LocInfo));
return;
State.addLoc(CCValAssign::getReg(ValNo, ArgVT, Reg, LocVT, LocInfo));
return false;
}
}
@ -1094,8 +1095,8 @@ static void X86_64_CCC_AssignArgument(unsigned ValNo,
X86::RDI, X86::RSI, X86::RDX, X86::RCX, X86::R8, X86::R9
};
if (unsigned Reg = State.AllocateReg(GPR64ArgRegs, 6)) {
Locs.push_back(CCValAssign::getReg(ValNo, ArgVT, Reg, LocVT, LocInfo));
return;
State.addLoc(CCValAssign::getReg(ValNo, ArgVT, Reg, LocVT, LocInfo));
return false;
}
}
@ -1107,8 +1108,8 @@ static void X86_64_CCC_AssignArgument(unsigned ValNo,
X86::XMM4, X86::XMM5, X86::XMM6, X86::XMM7
};
if (unsigned Reg = State.AllocateReg(XMMArgRegs, 8)) {
Locs.push_back(CCValAssign::getReg(ValNo, ArgVT, Reg, LocVT, LocInfo));
return;
State.addLoc(CCValAssign::getReg(ValNo, ArgVT, Reg, LocVT, LocInfo));
return false;
}
}
@ -1117,17 +1118,17 @@ static void X86_64_CCC_AssignArgument(unsigned ValNo,
if (LocVT == MVT::i32 || LocVT == MVT::i64 ||
LocVT == MVT::f32 || LocVT == MVT::f64) {
unsigned Offset = State.AllocateStack(8, 8);
Locs.push_back(CCValAssign::getMem(ValNo, ArgVT, Offset, LocVT, LocInfo));
return;
State.addLoc(CCValAssign::getMem(ValNo, ArgVT, Offset, LocVT, LocInfo));
return false;
}
// Vectors get 16-byte stack slots that are 16-byte aligned.
if (MVT::isVector(LocVT)) {
unsigned Offset = State.AllocateStack(16, 16);
Locs.push_back(CCValAssign::getMem(ValNo, ArgVT, Offset, LocVT, LocInfo));
return;
State.addLoc(CCValAssign::getMem(ValNo, ArgVT, Offset, LocVT, LocInfo));
return false;
}
assert(0 && "Unknown argument type!");
return true;
}
@ -1147,18 +1148,18 @@ X86TargetLowering::LowerX86_64CCCArguments(SDOperand Op, SelectionDAG &DAG) {
X86::XMM4, X86::XMM5, X86::XMM6, X86::XMM7
};
SmallVector<SDOperand, 8> ArgValues;
CCState CCInfo(*getTargetMachine().getRegisterInfo());
SmallVector<CCValAssign, 16> ArgLocs;
CCState CCInfo(MF.getFunction()->getCallingConv(), getTargetMachine(),
ArgLocs);
for (unsigned i = 0; i != NumArgs; ++i) {
MVT::ValueType ArgVT = Op.getValue(i).getValueType();
unsigned ArgFlags = cast<ConstantSDNode>(Op.getOperand(3+i))->getValue();
X86_64_CCC_AssignArgument(i, ArgVT, ArgFlags, CCInfo, ArgLocs);
if (X86_64_CCC_AssignArgument(i, ArgVT, ArgFlags, CCInfo))
assert(0 && "Unhandled argument type!");
}
SmallVector<SDOperand, 8> ArgValues;
unsigned LastVal = ~0U;
for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
CCValAssign &VA = ArgLocs[i];
@ -1280,13 +1281,14 @@ X86TargetLowering::LowerX86_64CCCCallTo(SDOperand Op, SelectionDAG &DAG,
SDOperand Callee = Op.getOperand(4);
unsigned NumOps = (Op.getNumOperands() - 5) / 2;
CCState CCInfo(*getTargetMachine().getRegisterInfo());
SmallVector<CCValAssign, 16> ArgLocs;
CCState CCInfo(CC, getTargetMachine(), ArgLocs);
for (unsigned i = 0; i != NumOps; ++i) {
MVT::ValueType ArgVT = Op.getOperand(5+2*i).getValueType();
unsigned ArgFlags =cast<ConstantSDNode>(Op.getOperand(5+2*i+1))->getValue();
X86_64_CCC_AssignArgument(i, ArgVT, ArgFlags, CCInfo, ArgLocs);
if (X86_64_CCC_AssignArgument(i, ArgVT, ArgFlags, CCInfo))
assert(0 && "Unhandled argument type!");
}
// Get a count of how many bytes are to be pushed on the stack.