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Add OptionalDefOperand to stand for optionally defined result. 

llvm-svn: 37930
This commit is contained in:
Evan Cheng 2007-07-06 01:00:16 +00:00
parent 02e9698293
commit eaa82198c4
1 changed files with 10 additions and 7 deletions
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17
llvm/lib/Target/Target.td
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@ -263,14 +263,13 @@ def zero_reg;
/// PredicateOperand - This can be used to define a predicate operand for an
/// instruction. OpTypes specifies the MIOperandInfo for the operand, and
/// AlwaysVal specifies the value of this predicate when set to "always
/// execute". If isOutput is true, then this is output operand. If isImmutable
/// is true, then the operand should not change after instruction selection.
/// execute". If isImmutable is true, then the operand should not change
/// after instruction selection.
class PredicateOperand<ValueType ty, dag OpTypes, dag AlwaysVal>
: Operand<ty> {
let MIOperandInfo = OpTypes;
bit isOutput = 0;
bit isImmutable = 0;
dag ExecuteAlways = AlwaysVal;
dag DefaultOps = AlwaysVal;
}
class ImmutablePredicateOperand<ValueType ty, dag OpTypes, dag AlwaysVal>
@ -278,9 +277,13 @@ class ImmutablePredicateOperand<ValueType ty, dag OpTypes, dag AlwaysVal>
let isImmutable = 1;
}
class PredicateDefOperand<ValueType ty, dag OpTypes, dag AlwaysVal>
: PredicateOperand<ty, OpTypes, AlwaysVal> {
let isOutput = 1;
/// OptionalDefOperand - This is used to define a optional definition operand
/// for an instruction. DefaultOps is the register the operand represents if none
/// is supplied, e.g. zero_reg.
class OptionalDefOperand<ValueType ty, dag OpTypes, dag defaultops>
: Operand<ty> {
let MIOperandInfo = OpTypes;
dag DefaultOps = defaultops;
}