// also in the second set.
//
// (sequence "R%u", 0, 15) -> [R0, R1, ..., R15]. Generate a sequence of
-// numbered registers.
+// numbered registers. Takes an optional 4th operand which is a stride to use
+// when generating the sequence.
//
// (shl GPR, 4) - Remove the first N elements.
//
def S9b : Set<(sequence "e%u", 7, 3)>;
def S9c : Set<(sequence "e%u", 0, 0)>;
def S9d : Set<(sequence "S%ua", 7, 9)>;
+def S9e : Set<(sequence "e%u", 3, 6, 2)>;
// CHECK: S9a = [ e3 e4 e5 e6 e7 ]
// CHECK: S9b = [ e7 e6 e5 e4 e3 ]
// CHECK: S9c = [ e0 ]
// CHECK: S9d = [ a b c d e0 e3 e6 e9 e4 e5 e7 ]
+// CHECK: S9e = [ e3 e5 ]
// The 'interleave' operator is almost the inverse of 'decimate'.
def interleave;
// (sequence "Format", From, To) Generate a sequence of records by name.
struct SequenceOp : public SetTheory::Operator {
void apply(SetTheory &ST, DagInit *Expr, RecSet &Elts) {
- if (Expr->arg_size() != 3)
+ int Step = 1;
+ if (Expr->arg_size() > 4)
throw "Bad args to (sequence \"Format\", From, To): " +
Expr->getAsString();
+ else if (Expr->arg_size() == 4) {
+ if (IntInit *II = dynamic_cast<IntInit*>(Expr->arg_begin()[3])) {
+ Step = II->getValue();
+ } else
+ throw "Stride must be an integer: " + Expr->getAsString();
+ }
+
std::string Format;
if (StringInit *SI = dynamic_cast<StringInit*>(Expr->arg_begin()[0]))
Format = SI->getValue();
RecordKeeper &Records =
dynamic_cast<DefInit&>(*Expr->getOperator()).getDef()->getRecords();
- int Step = From <= To ? 1 : -1;
- for (To += Step; From != To; From += Step) {
+ Step *= From <= To ? 1 : -1;
+ while (true) {
+ if (Step > 0 && From > To)
+ break;
+ else if (Step < 0 && From < To)
+ break;
std::string Name;
raw_string_ostream OS(Name);
OS << format(Format.c_str(), unsigned(From));
Elts.insert(Result->begin(), Result->end());
else
Elts.insert(Rec);
+
+ From += Step;
}
}
};