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remove 32 sign extend after 32 sextload and handle small negative constant 

llvm-svn: 20408
This commit is contained in:
Andrew Lenharth 2005-03-02 17:23:03 +00:00
parent ed4b6488a7
commit 180a04a4bb
1 changed files with 9 additions and 4 deletions
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13
llvm/lib/Target/Alpha/AlphaISelPattern.cpp
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@ -1027,6 +1027,10 @@ unsigned ISel::SelectExpr(SDOperand N) {
}
return Result;
}
case ISD::SEXTLOAD:
//SelectionDag isn't deleting the signextend after sextloads
Reg = Result = SelectExpr(N.getOperand(0));
return Result;
default: break; //Fall Though;
}
} //Every thing else fall though too, including unhandled opcodes above
@ -1304,10 +1308,11 @@ unsigned ISel::SelectExpr(SDOperand N) {
BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addImm(Tmp2);
}
else if(N.getOperand(1).getOpcode() == ISD::Constant &&
cast<ConstantSDNode>(N.getOperand(1))->getValue() <= 32767)
{ //LDA //FIXME: expand the above condition a bit
(cast<ConstantSDNode>(N.getOperand(1))->getValue() <= 32767 ||
(long)cast<ConstantSDNode>(N.getOperand(1))->getValue() >= -32767))
{ //LDA
Tmp1 = SelectExpr(N.getOperand(0));
Tmp2 = cast<ConstantSDNode>(N.getOperand(1))->getValue();
Tmp2 = (long)cast<ConstantSDNode>(N.getOperand(1))->getValue();
if (!isAdd)
Tmp2 = -Tmp2;
BuildMI(BB, Alpha::LDA, 2, Result).addImm(Tmp2).addReg(Tmp1);
@ -1387,7 +1392,7 @@ unsigned ISel::SelectExpr(SDOperand N) {
{
unsigned long val = cast<ConstantSDNode>(N)->getValue();
if (val < 32000 && (long)val > -32000)
BuildMI(BB, Alpha::LOAD_IMM, 1, Result).addImm(val);
BuildMI(BB, Alpha::LOAD_IMM, 1, Result).addImm((long)val);
else {
MachineConstantPool *CP = BB->getParent()->getConstantPool();
ConstantUInt *C = ConstantUInt::get(Type::getPrimitiveType(Type::ULongTyID) , val);