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Fix non-determinism in DAGISel emitter.

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- This manifested as non-determinism in the .inc output in rare cases (when two
   distinct patterns ended up being equivalent, which is rather rare). That
   meant the pattern matching was non-deterministic, which could eventually mean
   the code generator selected different instructions based on the arch.

 - It's probably worth making the DAGISel ensure a total ordering (or force the
   user to), but the simple fix here is to totally order the Record* maps based
   on a unique ID.

 - PR4672, PR4711.

Yay:
--
ddunbar@giles:~$ cat ~/llvm.obj.64/lib/Target/*/*.inc | shasum
d1099ff34b21459a5a3e7021c225c080e6017ece  -
ddunbar@giles:~$ cat ~/llvm.obj.ppc/lib/Target/*/*.inc | shasum
d1099ff34b21459a5a3e7021c225c080e6017ece  -
--

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79846 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar 2009-08-23 09:47:37 +00:00
parent ae60324d46
commit 6f5cc82686
4 changed files with 23 additions and 7 deletions
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3
utils/TableGen/CodeGenDAGPatterns.cpp
View File

@ -100,6 +100,9 @@ bool isExtVectorInVTs(const std::vector<unsigned char> &EVTs) {
} // end namespace EEVT.
} // end namespace llvm.
bool RecordPtrCmp::operator()(const Record *LHS, const Record *RHS) const {
return LHS->getID() < RHS->getID();
}
/// Dependent variable map for CodeGenDAGPattern variant generation
typedef std::map<std::string, int> DepVarMap;

16
utils/TableGen/CodeGenDAGPatterns.h
View File

@ -462,6 +462,10 @@ struct PatternToMatch {
std::string getPredicateCheck() const;
};
// Deterministic comparison of Record*.
struct RecordPtrCmp {
bool operator()(const Record *LHS, const Record *RHS) const;
};
class CodeGenDAGPatterns {
RecordKeeper &Records;
@ -469,12 +473,12 @@ class CodeGenDAGPatterns {
std::vector<CodeGenIntrinsic> Intrinsics;
std::vector<CodeGenIntrinsic> TgtIntrinsics;
std::map<Record*, SDNodeInfo> SDNodes;
std::map<Record*, std::pair<Record*, std::string> > SDNodeXForms;
std::map<Record*, ComplexPattern> ComplexPatterns;
std::map<Record*, TreePattern*> PatternFragments;
std::map<Record*, DAGDefaultOperand> DefaultOperands;
std::map<Record*, DAGInstruction> Instructions;
std::map<Record*, SDNodeInfo, RecordPtrCmp> SDNodes;
std::map<Record*, std::pair<Record*, std::string>, RecordPtrCmp> SDNodeXForms;
std::map<Record*, ComplexPattern, RecordPtrCmp> ComplexPatterns;
std::map<Record*, TreePattern*, RecordPtrCmp> PatternFragments;
std::map<Record*, DAGDefaultOperand, RecordPtrCmp> DefaultOperands;
std::map<Record*, DAGInstruction, RecordPtrCmp> Instructions;
// Specific SDNode definitions:
Record *intrinsic_void_sdnode;

2
utils/TableGen/Record.cpp
View File

@ -1319,6 +1319,8 @@ void RecordVal::print(raw_ostream &OS, bool PrintSem) const {
if (PrintSem) OS << ";\n";
}
unsigned Record::LastID = 0;
void Record::setName(const std::string &Name) {
if (Records.getDef(getName()) == this) {
Records.removeDef(getName());

9
utils/TableGen/Record.h
View File

@ -1220,6 +1220,10 @@ inline raw_ostream &operator<<(raw_ostream &OS, const RecordVal &RV) {
}
class Record {
static unsigned LastID;
// Unique record ID.
unsigned ID;
std::string Name;
SMLoc Loc;
std::vector<std::string> TemplateArgs;
@ -1227,9 +1231,12 @@ class Record {
std::vector<Record*> SuperClasses;
public:
explicit Record(const std::string &N, SMLoc loc) : Name(N), Loc(loc) {}
explicit Record(const std::string &N, SMLoc loc) :
ID(LastID++), Name(N), Loc(loc) {}
~Record() {}
unsigned getID() const { return ID; }
const std::string &getName() const { return Name; }
void setName(const std::string &Name); // Also updates RecordKeeper.