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Factor out some common code, and be smarter about when to emit load hi/lo

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code sequences.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22719 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nate Begeman 2005-08-08 22:22:56 +00:00
parent 0bc6bde317
commit d3ded2d8a7
1 changed files with 27 additions and 31 deletions
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58
lib/Target/PowerPC/PPCISelPattern.cpp
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@ -1186,7 +1186,7 @@ unsigned ISel::SelectCCExpr(SDOperand N, unsigned& Opc, bool &Inv,
return Result;
}
/// Check to see if the load is a constant offset from a base register
/// Check to see if the load is a constant offset from a base register.
unsigned ISel::SelectAddr(SDOperand N, unsigned& Reg, int& offset)
{
unsigned imm = 0, opcode = N.getOpcode();
@ -1208,6 +1208,22 @@ unsigned ISel::SelectAddr(SDOperand N, unsigned& Reg, int& offset)
return 2;
}
}
// Now check if we're dealing with a global, and whether or not we should emit
// an optimized load or store for statics.
if(GlobalAddressSDNode *GN = dyn_cast<GlobalAddressSDNode>(N)) {
GlobalValue *GV = GN->getGlobal();
if (!GV->hasWeakLinkage() && !GV->isExternal()) {
unsigned GlobalHi = MakeReg(MVT::i32);
if (PICEnabled)
BuildMI(BB, PPC::ADDIS, 2, GlobalHi).addReg(getGlobalBaseReg())
.addGlobalAddress(GV);
else
BuildMI(BB, PPC::LIS, 1, GlobalHi).addGlobalAddress(GV);
Reg = GlobalHi;
offset = 0;
return 3;
}
}
Reg = SelectExpr(N);
offset = 0;
return 0;
@ -1410,21 +1426,6 @@ unsigned ISel::SelectExpr(SDOperand N, bool Recording) {
} else if (Address.getOpcode() == ISD::FrameIndex) {
Tmp1 = cast<FrameIndexSDNode>(Address)->getIndex();
addFrameReference(BuildMI(BB, Opc, 2, Result), (int)Tmp1);
} else if(GlobalAddressSDNode *GN = dyn_cast<GlobalAddressSDNode>(Address)){
GlobalValue *GV = GN->getGlobal();
Tmp1 = MakeReg(MVT::i32);
if (PICEnabled)
BuildMI(BB, PPC::ADDIS, 2, Tmp1).addReg(getGlobalBaseReg())
.addGlobalAddress(GV);
else
BuildMI(BB, PPC::LIS, 1, Tmp1).addGlobalAddress(GV);
if (GV->hasWeakLinkage() || GV->isExternal()) {
Tmp2 = MakeReg(MVT::i32);
BuildMI(BB, PPC::LWZ, 2, Tmp2).addGlobalAddress(GV).addReg(Tmp1);
BuildMI(BB, Opc, 2, Result).addSImm(0).addReg(Tmp2);
} else {
BuildMI(BB, Opc, 2, Result).addGlobalAddress(GV).addReg(Tmp1);
}
} else {
int offset;
switch(SelectAddr(Address, Tmp1, offset)) {
@ -1439,6 +1440,11 @@ unsigned ISel::SelectExpr(SDOperand N, bool Recording) {
Opc = IndexedOpForOp(Opc);
BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addReg(offset);
break;
case 3: {
GlobalAddressSDNode *GN = cast<GlobalAddressSDNode>(Address);
GlobalValue *GV = GN->getGlobal();
BuildMI(BB, Opc, 2, Result).addGlobalAddress(GV).addReg(Tmp1);
}
}
}
return Result;
@ -2490,21 +2496,6 @@ void ISel::Select(SDOperand N) {
if(Address.getOpcode() == ISD::FrameIndex) {
Tmp2 = cast<FrameIndexSDNode>(Address)->getIndex();
addFrameReference(BuildMI(BB, Opc, 3).addReg(Tmp1), (int)Tmp2);
} else if(GlobalAddressSDNode *GN = dyn_cast<GlobalAddressSDNode>(Address)){
GlobalValue *GV = GN->getGlobal();
Tmp2 = MakeReg(MVT::i32);
if (PICEnabled)
BuildMI(BB, PPC::ADDIS, 2, Tmp2).addReg(getGlobalBaseReg())
.addGlobalAddress(GV);
else
BuildMI(BB, PPC::LIS, 1, Tmp2).addGlobalAddress(GV);
if (GV->hasWeakLinkage() || GV->isExternal()) {
Tmp3 = MakeReg(MVT::i32);
BuildMI(BB, PPC::LWZ, 2, Tmp3).addGlobalAddress(GV).addReg(Tmp2);
BuildMI(BB, Opc, 3).addReg(Tmp1).addSImm(0).addReg(Tmp3);
} else {
BuildMI(BB, Opc, 3).addReg(Tmp1).addGlobalAddress(GV).addReg(Tmp2);
}
} else {
int offset;
switch(SelectAddr(Address, Tmp2, offset)) {
@ -2519,6 +2510,11 @@ void ISel::Select(SDOperand N) {
Opc = IndexedOpForOp(Opc);
BuildMI(BB, Opc, 3).addReg(Tmp1).addReg(Tmp2).addReg(offset);
break;
case 3: {
GlobalAddressSDNode *GN = cast<GlobalAddressSDNode>(Address);
GlobalValue *GV = GN->getGlobal();
BuildMI(BB, Opc, 3).addReg(Tmp1).addGlobalAddress(GV).addReg(Tmp2);
}
}
}
return;