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Define DAGOperand, an empty base class for RegisterClass and Operand. This allows one to write multiclasses that are polymorphic over both registers and non-register operands.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159162 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2012-06-25 21:25:16 +00:00
parent 58fb3401fa
commit 2c5fbb9bcb
1 changed files with 9 additions and 2 deletions
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11
include/llvm/Target/Target.td
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@ -111,13 +111,20 @@ class RegisterWithSubRegs<string n, list<Register> subregs> : Register<n> {
let SubRegs = subregs;
}
// DAGOperand - An empty base class that unifies RegisterClass's and other forms
// of Operand's that are legal as type qualifiers in DAG patterns. This should
// only ever be used for defining multiclasses that are polymorphic over both
// RegisterClass's and other Operand's.
class DAGOperand { }
// RegisterClass - Now that all of the registers are defined, and aliases
// between registers are defined, specify which registers belong to which
// register classes. This also defines the default allocation order of
// registers by register allocators.
//
class RegisterClass<string namespace, list<ValueType> regTypes, int alignment,
dag regList, RegAltNameIndex idx = NoRegAltName> {
dag regList, RegAltNameIndex idx = NoRegAltName>
: DAGOperand {
string Namespace = namespace;
// RegType - Specify the list ValueType of the registers in this register
@ -537,7 +544,7 @@ def ImmAsmOperand : AsmOperandClass {
/// Operand Types - These provide the built-in operand types that may be used
/// by a target. Targets can optionally provide their own operand types as
/// needed, though this should not be needed for RISC targets.
class Operand<ValueType ty> {
class Operand<ValueType ty> : DAGOperand {
ValueType Type = ty;
string PrintMethod = "printOperand";
string EncoderMethod = "";