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[TableGen] Handle (outs variable_ops)

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When `variable_ops` is specified in `InOperandList` of instruction,
it behaves as expected, i.e., does not count as operand.
So for `(ins variable_ops)` instruction description will have 0
operands.  However when used in OutOperandList it is counted as
operand. So `(outs variable_ops)` results in instruction with
one def.
This patch makes behavior of `variable_ops` in `out` list to match
that of `in` list.

Reviewed By: reames
Differential Revision: https://reviews.llvm.org/D81095
This commit is contained in:
Denis Antrushin 2020-06-03 17:08:48 +03:00
parent 5c6a96f031
commit 99d7b2a3a2
1 changed files with 5 additions and 0 deletions
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5
utils/TableGen/CodeGenInstruction.cpp
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@ -56,6 +56,7 @@ CGIOperandList::CGIOperandList(Record *R) : TheDef(R) {
std::set<std::string> OperandNames;
unsigned e = InDI->getNumArgs() + OutDI->getNumArgs();
OperandList.reserve(e);
bool VariadicOuts = false;
for (unsigned i = 0; i != e; ++i){
Init *ArgInit;
StringRef ArgName;
@ -109,6 +110,8 @@ CGIOperandList::CGIOperandList(Record *R) : TheDef(R) {
else if (Rec->isSubClassOf("OptionalDefOperand"))
hasOptionalDef = true;
} else if (Rec->getName() == "variable_ops") {
if (i < NumDefs)
VariadicOuts = true;
isVariadic = true;
continue;
} else if (Rec->isSubClassOf("RegisterClass")) {
@ -137,6 +140,8 @@ CGIOperandList::CGIOperandList(Record *R) : TheDef(R) {
MIOperandNo += NumOps;
}
if (VariadicOuts)
--NumDefs;
// Make sure the constraints list for each operand is large enough to hold
// constraint info, even if none is present.