[llvm-commits] [llvm] r37892 - /llvm/trunk/lib/Target/Target.td

[Evan Cheng]

Author: evancheng
Date: Thu Jul  5 02:09:09 2007
New Revision: 37892

URL: http://llvm.org/viewvc/llvm-project?rev=37892&view=rev
Log:
- Added zero_reg def to stand for register 0.
- Added two variants of PredicateOperand: ImmutablePredicateOperand, whose predicate does not change after isel; PredicateDefOperand, which represent a predicate defintion operand.

Modified:
    llvm/trunk/lib/Target/Target.td

Modified: llvm/trunk/lib/Target/Target.td
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/Target.td?rev=37892&r1=37891&r2=37892&view=diff

==============================================================================
--- llvm/trunk/lib/Target/Target.td (original)
+++ llvm/trunk/lib/Target/Target.td Thu Jul  5 02:09:09 2007
@@ -256,16 +256,33 @@
 def i32imm : Operand<i32>;
 def i64imm : Operand<i64>;
 
+/// zero_reg definition - Special node to stand for the zero register.
+///
+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".
-class PredicateOperand<ValueType ty, dag OpTypes, dag AlwaysVal> : Operand<ty> {
+/// execute". If isOutput is true, then this is output operand. 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;
 }
 
+class ImmutablePredicateOperand<ValueType ty, dag OpTypes, dag AlwaysVal>
+  : PredicateOperand<ty, OpTypes, AlwaysVal> {
+  let isImmutable = 1;
+}
+
+class PredicateDefOperand<ValueType ty, dag OpTypes, dag AlwaysVal>
+  : PredicateOperand<ty, OpTypes, AlwaysVal> {
+  let isOutput = 1;
+}
+
 
 // InstrInfo - This class should only be instantiated once to provide parameters
 // which are global to the the target machine.