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Use movups to spill / restore SSE registers on targets where stacks alignment is

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less than 16. This is a temporary solution until dynamic stack alignment is
implemented.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43703 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2007-11-05 07:30:01 +00:00
parent b0f0deb069
commit db807edd66
2 changed files with 24 additions and 15 deletions
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35
lib/Target/X86/X86RegisterInfo.cpp
View File

@ -55,6 +55,7 @@ X86RegisterInfo::X86RegisterInfo(X86TargetMachine &tm,
// Cache some information.
const X86Subtarget *Subtarget = &TM.getSubtarget<X86Subtarget>();
Is64Bit = Subtarget->is64Bit();
StackAlign = TM.getFrameInfo()->getStackAlignment();
if (Is64Bit) {
SlotSize = 8;
StackPtr = X86::RSP;
@ -761,7 +762,8 @@ static const MachineInstrBuilder &X86InstrAddOperand(MachineInstrBuilder &MIB,
return MIB;
}
static unsigned getStoreRegOpcode(const TargetRegisterClass *RC) {
static unsigned getStoreRegOpcode(const TargetRegisterClass *RC,
unsigned StackAlign) {
unsigned Opc = 0;
if (RC == &X86::GR64RegClass) {
Opc = X86::MOV64mr;
@ -786,7 +788,9 @@ static unsigned getStoreRegOpcode(const TargetRegisterClass *RC) {
} else if (RC == &X86::FR64RegClass) {
Opc = X86::MOVSDmr;
} else if (RC == &X86::VR128RegClass) {
Opc = X86::MOVAPSmr;
// FIXME: Use movaps once we are capable of selectively
// aligning functions that spill SSE registers on 16-byte boundaries.
Opc = StackAlign >= 16 ? X86::MOVAPSmr : X86::MOVUPSmr;
} else if (RC == &X86::VR64RegClass) {
Opc = X86::MMX_MOVQ64mr;
} else {
@ -801,7 +805,7 @@ void X86RegisterInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
unsigned SrcReg, int FrameIdx,
const TargetRegisterClass *RC) const {
unsigned Opc = getStoreRegOpcode(RC);
unsigned Opc = getStoreRegOpcode(RC, StackAlign);
addFrameReference(BuildMI(MBB, MI, TII.get(Opc)), FrameIdx)
.addReg(SrcReg, false, false, true);
}
@ -810,7 +814,7 @@ void X86RegisterInfo::storeRegToAddr(MachineFunction &MF, unsigned SrcReg,
SmallVectorImpl<MachineOperand> &Addr,
const TargetRegisterClass *RC,
SmallVectorImpl<MachineInstr*> &NewMIs) const {
unsigned Opc = getStoreRegOpcode(RC);
unsigned Opc = getStoreRegOpcode(RC, StackAlign);
MachineInstrBuilder MIB = BuildMI(TII.get(Opc));
for (unsigned i = 0, e = Addr.size(); i != e; ++i)
MIB = X86InstrAddOperand(MIB, Addr[i]);
@ -818,7 +822,8 @@ void X86RegisterInfo::storeRegToAddr(MachineFunction &MF, unsigned SrcReg,
NewMIs.push_back(MIB);
}
static unsigned getLoadRegOpcode(const TargetRegisterClass *RC) {
static unsigned getLoadRegOpcode(const TargetRegisterClass *RC,
unsigned StackAlign) {
unsigned Opc = 0;
if (RC == &X86::GR64RegClass) {
Opc = X86::MOV64rm;
@ -843,7 +848,9 @@ static unsigned getLoadRegOpcode(const TargetRegisterClass *RC) {
} else if (RC == &X86::FR64RegClass) {
Opc = X86::MOVSDrm;
} else if (RC == &X86::VR128RegClass) {
Opc = X86::MOVAPSrm;
// FIXME: Use movaps once we are capable of selectively
// aligning functions that spill SSE registers on 16-byte boundaries.
Opc = StackAlign >= 16 ? X86::MOVAPSrm : X86::MOVUPSrm;
} else if (RC == &X86::VR64RegClass) {
Opc = X86::MMX_MOVQ64rm;
} else {
@ -858,7 +865,7 @@ void X86RegisterInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
unsigned DestReg, int FrameIdx,
const TargetRegisterClass *RC) const{
unsigned Opc = getLoadRegOpcode(RC);
unsigned Opc = getLoadRegOpcode(RC, StackAlign);
addFrameReference(BuildMI(MBB, MI, TII.get(Opc), DestReg), FrameIdx);
}
@ -866,7 +873,7 @@ void X86RegisterInfo::loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
SmallVectorImpl<MachineOperand> &Addr,
const TargetRegisterClass *RC,
SmallVectorImpl<MachineInstr*> &NewMIs) const {
unsigned Opc = getLoadRegOpcode(RC);
unsigned Opc = getLoadRegOpcode(RC, StackAlign);
MachineInstrBuilder MIB = BuildMI(TII.get(Opc), DestReg);
for (unsigned i = 0, e = Addr.size(); i != e; ++i)
MIB = X86InstrAddOperand(MIB, Addr[i]);
@ -1284,7 +1291,7 @@ X86RegisterInfo::unfoldMemoryOperand(SelectionDAG &DAG, SDNode *N,
SDNode *Load = 0;
if (FoldedLoad) {
MVT::ValueType VT = *RC->vt_begin();
Load = DAG.getTargetNode(getLoadRegOpcode(RC), VT, MVT::Other,
Load = DAG.getTargetNode(getLoadRegOpcode(RC, StackAlign), VT, MVT::Other,
&AddrOps[0], AddrOps.size());
NewNodes.push_back(Load);
}
@ -1314,7 +1321,7 @@ X86RegisterInfo::unfoldMemoryOperand(SelectionDAG &DAG, SDNode *N,
AddrOps.pop_back();
AddrOps.push_back(SDOperand(NewNode, 0));
AddrOps.push_back(Chain);
SDNode *Store = DAG.getTargetNode(getStoreRegOpcode(DstRC),
SDNode *Store = DAG.getTargetNode(getStoreRegOpcode(DstRC, StackAlign),
MVT::Other, &AddrOps[0], AddrOps.size());
NewNodes.push_back(Store);
}
@ -1446,8 +1453,7 @@ eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
// We need to keep the stack aligned properly. To do this, we round the
// amount of space needed for the outgoing arguments up to the next
// alignment boundary.
unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
Amount = (Amount+Align-1)/Align*Align;
Amount = (Amount+StackAlign-1)/StackAlign*StackAlign;
MachineInstr *New = 0;
if (Old->getOpcode() == X86::ADJCALLSTACKDOWN) {
@ -1666,7 +1672,6 @@ static int mergeSPUpdates(MachineBasicBlock &MBB,
void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
MachineFrameInfo *MFI = MF.getFrameInfo();
unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
const Function* Fn = MF.getFunction();
const X86Subtarget* Subtarget = &MF.getTarget().getSubtarget<X86Subtarget>();
MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
@ -1842,10 +1847,10 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
if (Fn->hasExternalLinkage() && Fn->getName() == "main" &&
Subtarget->isTargetCygMing()) {
BuildMI(MBB, MBBI, TII.get(X86::AND32ri), X86::ESP)
.addReg(X86::ESP).addImm(-Align);
.addReg(X86::ESP).addImm(-StackAlign);
// Probe the stack
BuildMI(MBB, MBBI, TII.get(X86::MOV32ri), X86::EAX).addImm(Align);
BuildMI(MBB, MBBI, TII.get(X86::MOV32ri), X86::EAX).addImm(StackAlign);
BuildMI(MBB, MBBI, TII.get(X86::CALLpcrel32)).addExternalSymbol("_alloca");
}
}

4
lib/Target/X86/X86RegisterInfo.h
View File

@ -46,6 +46,10 @@ private:
///
unsigned SlotSize;
/// StackAlign - Default stack alignment.
///
unsigned StackAlign;
/// StackPtr - X86 physical register used as stack ptr.
///
unsigned StackPtr;