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Fix incorrect ScheduleDAG comment and formalize Weak edges.

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llvm-svn: 176315
This commit is contained in:
Andrew Trick 2013-03-01 00:19:12 +00:00
parent 021492ef25
commit e602ffc5f9
1 changed files with 12 additions and 2 deletions
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14
include/llvm/CodeGen/ScheduleDAG.h
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@ -52,11 +52,21 @@ namespace llvm {
Order ///< Any other ordering dependency.
};
// Strong dependencies must be respected by the scheduler. Artificial
// dependencies may be removed only if they are redundant with another
// strong depedence.
//
// Weak dependencies may be violated by the scheduling strategy, but only if
// the strategy can prove it is correct to do so.
//
// Strong OrderKinds must occur before "Weak".
// Weak OrderKinds must occur after "Weak".
enum OrderKind {
Barrier, ///< An unknown scheduling barrier.
MayAliasMem, ///< Nonvolatile load/Store instructions that may alias.
MustAliasMem, ///< Nonvolatile load/Store instructions that must alias.
Artificial, ///< Arbitrary weak DAG edge (no actual dependence).
Artificial, ///< Arbitrary strong DAG edge (no real dependence).
Weak, ///< Arbitrary weak DAG edge.
Cluster ///< Weak DAG edge linking a chain of clustered instrs.
};
@ -205,7 +215,7 @@ namespace llvm {
/// not force ordering. Breaking a weak edge may require the scheduler to
/// compensate, for example by inserting a copy.
bool isWeak() const {
return getKind() == Order && Contents.OrdKind == Cluster;
return getKind() == Order && Contents.OrdKind >= Weak;
}
/// isArtificial - Test if this is an Order dependence that is marked