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Teach tblgen's set theory "sequence" operator to support an optional stride operand.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157416 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson
2012-05-24 21:37:08 +00:00
parent d6d05e3f78
commit 6b31d4ea36
3 changed files with 21 additions and 4 deletions
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utils/TableGen/SetTheory.cpp
+17 -3
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@@ -160,9 +160,17 @@ struct InterleaveOp : public SetTheory::Operator {
// (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();
@@ -187,8 +195,12 @@ struct SequenceOp : public SetTheory::Operator {
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));
@@ -200,6 +212,8 @@ struct SequenceOp : public SetTheory::Operator {
Elts.insert(Result->begin(), Result->end());
else
Elts.insert(Rec);
From += Step;
}
}
};