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Add support for ANY_EXTEND and add a few minor folds for it

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23203 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-09-02 00:17:32 +00:00
parent fb8b8a75ff
commit 4ed11b4b79
1 changed files with 11 additions and 1 deletions

12
lib/CodeGen/SelectionDAG/SelectionDAG.cpp

@ -1000,6 +1000,7 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
switch (Opcode) {
default: break;
case ISD::SIGN_EXTEND: return getConstant(C->getSignExtended(), VT);
case ISD::ANY_EXTEND:
case ISD::ZERO_EXTEND: return getConstant(Val, VT);
case ISD::TRUNCATE: return getConstant(Val, VT);
case ISD::SINT_TO_FP: return getConstantFP(C->getSignExtended(), VT);
@ -1034,11 +1035,18 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
if (OpOpcode == ISD::ZERO_EXTEND) // (zext (zext x)) -> (zext x)
return getNode(ISD::ZERO_EXTEND, VT, Operand.Val->getOperand(0));
break;
case ISD::ANY_EXTEND:
if (Operand.getValueType() == VT) return Operand; // noop extension
if (OpOpcode == ISD::ZERO_EXTEND || OpOpcode == ISD::SIGN_EXTEND)
// (ext (zext x)) -> (zext x) and (ext (sext x)) -> (sext x)
return getNode(OpOpcode, VT, Operand.Val->getOperand(0));
break;
case ISD::TRUNCATE:
if (Operand.getValueType() == VT) return Operand; // noop truncate
if (OpOpcode == ISD::TRUNCATE)
return getNode(ISD::TRUNCATE, VT, Operand.Val->getOperand(0));
else if (OpOpcode == ISD::ZERO_EXTEND || OpOpcode == ISD::SIGN_EXTEND) {
else if (OpOpcode == ISD::ZERO_EXTEND || OpOpcode == ISD::SIGN_EXTEND ||
OpOpcode == ISD::ANY_EXTEND) {
// If the source is smaller than the dest, we still need an extend.
if (Operand.Val->getOperand(0).getValueType() < VT)
return getNode(OpOpcode, VT, Operand.Val->getOperand(0));
@ -1378,6 +1386,7 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
// FIXME: Should add a corresponding version of this for
// ZERO_EXTEND/SIGN_EXTEND by converting them to an ANY_EXTEND node which
// we don't have yet.
// FIXME: NOW WE DO, add this.
// and (sign_extend_inreg x:16:32), 1 -> and x, 1
if (N1.getOpcode() == ISD::SIGN_EXTEND_INREG) {
@ -2251,6 +2260,7 @@ const char *SDNode::getOperationName(const SelectionDAG *G) const {
// Conversion operators.
case ISD::SIGN_EXTEND: return "sign_extend";
case ISD::ZERO_EXTEND: return "zero_extend";
case ISD::ANY_EXTEND: return "any_extend";
case ISD::SIGN_EXTEND_INREG: return "sign_extend_inreg";
case ISD::TRUNCATE: return "truncate";
case ISD::FP_ROUND: return "fp_round";