NotDuplicable,
DelaySlot,
SimpleLoad,
+ MayLoad,
MayStore,
NeverHasSideEffects,
MayHaveSideEffects,
//===--------------------------------------------------------------------===//
// Side Effect Analysis
//===--------------------------------------------------------------------===//
+
+ /// mayLoad - Return true if this instruction could possibly read memory.
+ /// Instructions with this flag set are not necessarily simple load
+ /// instructions, they may load a value and modify it, for example.
+ bool mayLoad() const {
+ return Flags & (1 << TID::MayLoad);
+ }
+
/// mayStore - Return true if this instruction could possibly modify memory.
/// Instructions with this flag set are not necessarily simple store
return Flags & (1 << TID::MayStore);
}
- // TODO: mayLoad.
-
/// hasNoSideEffects - Return true if all instances of this instruction are
/// guaranteed to have no side effects other than:
/// 1. The register operands that are def/used by the MachineInstr.
class InstAnalyzer {
const CodeGenDAGPatterns &CDP;
bool &mayStore;
- bool &isLoad;
+ bool &mayLoad;
bool &NeverHasSideEffects;
public:
InstAnalyzer(const CodeGenDAGPatterns &cdp,
- bool &maystore, bool &isload, bool &nhse)
- : CDP(cdp), mayStore(maystore), isLoad(isload), NeverHasSideEffects(nhse) {
+ bool &maystore, bool &mayload, bool &nhse)
+ : CDP(cdp), mayStore(maystore), mayLoad(mayload), NeverHasSideEffects(nhse){
}
void Analyze(Record *InstRecord) {
private:
void AnalyzeNode(const TreePatternNode *N) {
- if (N->isLeaf()) {
+ if (N->isLeaf())
return;
- }
if (N->getOperator()->getName() != "set") {
// Get information about the SDNode for the operator.
};
void InstrInfoEmitter::InferFromPattern(const CodeGenInstruction &Inst,
- bool &mayStore, bool &isLoad,
+ bool &mayStore, bool &mayLoad,
bool &NeverHasSideEffects) {
- mayStore = isLoad = NeverHasSideEffects = false;
+ mayStore = mayLoad = NeverHasSideEffects = false;
- InstAnalyzer(CDP, mayStore, isLoad, NeverHasSideEffects).Analyze(Inst.TheDef);
+ InstAnalyzer(CDP, mayStore, mayLoad,NeverHasSideEffects).Analyze(Inst.TheDef);
// InstAnalyzer only correctly analyzes mayStore so far.
if (Inst.mayStore) { // If the .td file explicitly sets mayStore, use it.
}
// These two override everything.
- isLoad = Inst.isSimpleLoad;
+ mayLoad = Inst.mayLoad;
NeverHasSideEffects = Inst.neverHasSideEffects;
#if 0
const OperandInfoMapTy &OpInfo,
std::ostream &OS) {
// Determine properties of the instruction from its pattern.
- bool mayStore, isSimpleLoad, NeverHasSideEffects;
- InferFromPattern(Inst, mayStore, isSimpleLoad, NeverHasSideEffects);
+ bool mayStore, mayLoad, NeverHasSideEffects;
+ InferFromPattern(Inst, mayStore, mayLoad, NeverHasSideEffects);
if (NeverHasSideEffects && Inst.mayHaveSideEffects) {
std::cerr << "error: Instruction '" << Inst.TheDef->getName()
if (Inst.isBarrier) OS << "|(1<<TID::Barrier)";
if (Inst.hasDelaySlot) OS << "|(1<<TID::DelaySlot)";
if (Inst.isCall) OS << "|(1<<TID::Call)";
- if (isSimpleLoad) OS << "|(1<<TID::SimpleLoad)";
+ if (Inst.isSimpleLoad) OS << "|(1<<TID::SimpleLoad)";
+ if (mayLoad) OS << "|(1<<TID::MayLoad)";
if (mayStore) OS << "|(1<<TID::MayStore)";
if (Inst.isImplicitDef)OS << "|(1<<TID::ImplicitDef)";
if (Inst.isPredicable) OS << "|(1<<TID::Predicable)";