diff options
Diffstat (limited to 'llvm/utils/TableGen/CodeGenInstruction.cpp')
| -rw-r--r-- | llvm/utils/TableGen/CodeGenInstruction.cpp | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/llvm/utils/TableGen/CodeGenInstruction.cpp b/llvm/utils/TableGen/CodeGenInstruction.cpp index 46e6591fdc9..fb9ad9371be 100644 --- a/llvm/utils/TableGen/CodeGenInstruction.cpp +++ b/llvm/utils/TableGen/CodeGenInstruction.cpp @@ -468,9 +468,13 @@ bool CodeGenInstAlias::tryAliasOpMatch(DagInit *Result, unsigned AliasOpNo, if (ADI && ADI->getDef()->getName() == "zero_reg") { // Check if this is an optional def. - if (!InstOpRec->isSubClassOf("OptionalDefOperand")) - throw TGError(Loc, "reg0 used for result that is not an " - "OptionalDefOperand!"); + // Tied operands where the source is a sub-operand of a complex operand + // need to represent both operands in the alias destination instruction. + // Allow zero_reg for the tied portion. This can and should go away once + // the MC representation of things doesn't use tied operands at all. + //if (!InstOpRec->isSubClassOf("OptionalDefOperand")) + // throw TGError(Loc, "reg0 used for result that is not an " + // "OptionalDefOperand!"); ResOp = ResultOperand(static_cast<Record*>(0)); return true; @@ -537,8 +541,11 @@ CodeGenInstAlias::CodeGenInstAlias(Record *R, CodeGenTarget &T) : TheDef(R) { unsigned AliasOpNo = 0; for (unsigned i = 0, e = ResultInst->Operands.size(); i != e; ++i) { - // Tied registers don't have an entry in the result dag. - if (ResultInst->Operands[i].getTiedRegister() != -1) + // Tied registers don't have an entry in the result dag unless they're part + // of a complex operand, in which case we include them anyways, as we + // don't have any other way to specify the whole operand. + if (ResultInst->Operands[i].MINumOperands == 1 && + ResultInst->Operands[i].getTiedRegister() != -1) continue; if (AliasOpNo >= Result->getNumArgs()) |
