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Support indexed loads and stores. This drops Shootout/matrix time from 

18.8 to 14.8 seconds.  The Pattern ISel is now often faster than the
Simple ISel, esp. on memory intensive code.

llvm-svn: 20973
This commit is contained in:
Nate Begeman 2005-04-01 04:45:11 +00:00
parent f4d91610ff
commit 839b34c367
1 changed files with 40 additions and 11 deletions
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51
llvm/lib/Target/PowerPC/PPC32ISelPattern.cpp
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@ -469,7 +469,7 @@ public:
unsigned SelectExprFP(SDOperand N, unsigned Result);
void Select(SDOperand N);
void SelectAddr(SDOperand N, unsigned& Reg, int& offset);
bool SelectAddr(SDOperand N, unsigned& Reg, int& offset);
void SelectBranchCC(SDOperand N);
};
@ -529,6 +529,22 @@ static unsigned getBCCForSetCC(unsigned Condition, bool& U) {
case ISD::SETUGE: U = true;
case ISD::SETGE: return PPC::BGE;
}
return 0;
}
/// IndexedOpForOp - Return the indexed variant for each of the PowerPC load
/// and store immediate instructions.
static unsigned IndexedOpForOp(unsigned Opcode) {
switch(Opcode) {
default: assert(0 && "Unknown opcode!"); abort();
case PPC::LBZ: return PPC::LBZX; case PPC::STB: return PPC::STBX;
case PPC::LHZ: return PPC::LHZX; case PPC::STH: return PPC::STHX;
case PPC::LHA: return PPC::LHAX; case PPC::STW: return PPC::STWX;
case PPC::LWZ: return PPC::LWZX; case PPC::STFS: return PPC::STFSX;
case PPC::LFS: return PPC::LFSX; case PPC::STFD: return PPC::STFDX;
case PPC::LFD: return PPC::LFDX;
}
return 0;
}
}
@ -598,18 +614,21 @@ unsigned ISel::SelectSetCR0(SDOperand CC) {
}
/// Check to see if the load is a constant offset from a base register
void ISel::SelectAddr(SDOperand N, unsigned& Reg, int& offset)
bool ISel::SelectAddr(SDOperand N, unsigned& Reg, int& offset)
{
unsigned imm = 0, opcode = N.getOpcode();
if (N.getOpcode() == ISD::ADD)
if (N.getOpcode() == ISD::ADD) {
Reg = SelectExpr(N.getOperand(0));
if (1 == canUseAsImmediateForOpcode(N.getOperand(1), opcode, imm)) {
Reg = SelectExpr(N.getOperand(0));
offset = imm;
return;
}
return false;
}
offset = SelectExpr(N.getOperand(1));
return true;
}
Reg = SelectExpr(N);
offset = 0;
return;
return false;
}
void ISel::SelectBranchCC(SDOperand N)
@ -988,8 +1007,13 @@ unsigned ISel::SelectExpr(SDOperand N) {
addFrameReference(BuildMI(BB, Opc, 2, Result), (int)Tmp1);
} else {
int offset;
SelectAddr(Address, Tmp1, offset);
BuildMI(BB, Opc, 2, Result).addSImm(offset).addReg(Tmp1);
bool idx = SelectAddr(Address, Tmp1, offset);
if (idx) {
Opc = IndexedOpForOp(Opc);
BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addReg(offset);
} else {
BuildMI(BB, Opc, 2, Result).addSImm(offset).addReg(Tmp1);
}
}
return Result;
}
@ -1534,8 +1558,13 @@ void ISel::Select(SDOperand N) {
else
{
int offset;
SelectAddr(Address, Tmp2, offset);
BuildMI(BB, Opc, 3).addReg(Tmp1).addImm(offset).addReg(Tmp2);
bool idx = SelectAddr(Address, Tmp2, offset);
if (idx) {
Opc = IndexedOpForOp(Opc);
BuildMI(BB, Opc, 3).addReg(Tmp1).addReg(Tmp2).addReg(offset);
} else {
BuildMI(BB, Opc, 3).addReg(Tmp1).addImm(offset).addReg(Tmp2);
}
}
return;
}