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GP-4300 Full extended division in optimized division rules

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caheckman 2024-03-27 22:55:19 +00:00
parent c63be6d2c3
commit 4bbbba3e5a
17 changed files with 821 additions and 228 deletions
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30
Ghidra/Features/Decompiler/src/decompile/cpp/funcdata_varnode.cc
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@ -372,6 +372,36 @@ Varnode *Funcdata::setInputVarnode(Varnode *vn)
return vn;
}
/// Construct a constant Varnode up to 128 bits, using INT_ZEXT and PIECE if necessary.
/// This method is temporary until we have full extended precision constants.
/// \param s is the size of the Varnode in bytes
/// \param val is the 128-bit value in 2 64-bit chunks
/// \param op is point before which any new PcodeOp should get inserted
/// \return the new effective constant Varnode
Varnode *Funcdata::newExtendedConstant(int4 s,uint8 *val,PcodeOp *op)
{
if (s <= 8)
return newConstant(s, val[0]);
Varnode *newConstVn;
if (val[1] == 0) {
PcodeOp *extOp = newOp(1,op->getAddr());
opSetOpcode(extOp,CPUI_INT_ZEXT);
newConstVn = newUniqueOut(s,extOp);
opSetInput(extOp,newConstant(8,val[0]),0);
opInsertBefore(extOp,op);
}
else {
PcodeOp *pieceOp = newOp(2,op->getAddr());
opSetOpcode(pieceOp,CPUI_PIECE);
newConstVn = newUniqueOut(s,pieceOp);
opSetInput(pieceOp,newConstant(8,val[1]),0); // Most significant piece
opSetInput(pieceOp,newConstant(8,val[0]),1); // Least significant piece
opInsertBefore(pieceOp,op);
}
return newConstVn;
}
/// \brief Adjust input Varnodes contained in the given range
///
/// After this call, a single \e input Varnode will exist that fills the given range.