remove 32 sign extend after 32 sextload and handle small negative constant
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20408 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Alpha/AlphaISelPattern.cpp b/lib/Target/Alpha/AlphaISelPattern.cpp
index 41028da..f2d922a 100644
--- a/lib/Target/Alpha/AlphaISelPattern.cpp
+++ b/lib/Target/Alpha/AlphaISelPattern.cpp
@@ -1027,6 +1027,10 @@
}
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 @@
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 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);