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RulePullsubMulti adjustment

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This commit is contained in:
caheckman 2020-03-02 09:21:00 -05:00
parent 47290cc0f8
commit 921eb9c5e6
1 changed files with 15 additions and 2 deletions
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17
Ghidra/Features/Decompiler/src/decompile/cpp/ruleaction.cc
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@ -945,11 +945,24 @@ int4 RulePullsubMulti::applyOp(PcodeOp *op,Funcdata &data)
Varnode *outvn = op->getOut();
if (outvn->isPrecisLo()||outvn->isPrecisHi()) return 0; // Don't pull apart a double precision object
// Make sure we don't new add SUBPIECE ops that aren't going to cancel in some way
int4 branches = mult->numInput();
uintb consume = calc_mask(newSize) << 8*minByte;
consume = ~consume;
consume = ~consume; // Check for use of bits outside of what gets truncated later
for(int4 i=0;i<branches;++i) {
if ((consume & mult->getIn(i)->getConsume()) != 0) return 0;
Varnode *inVn = mult->getIn(i);
if ((consume & inVn->getConsume()) != 0) { // Check if bits not truncated are still used
// Check if there's an extension that matches the truncation
if (minByte == 0 && inVn->isWritten()) {
PcodeOp *defOp = inVn->getDef();
OpCode opc = defOp->code();
if (opc == CPUI_INT_ZEXT || opc == CPUI_INT_SEXT) {
if (newSize == defOp->getIn(0)->getSize())
continue; // We have matching extension, so new SUBPIECE will cancel anyway
}
}
return 0;
}
}
Address smalladdr2;