Add more trace query functions.
Trace::getResourceLength() computes the number of cycles required to
execute the trace when ignoring data dependencies. The number can be
compared to the critical path to estimate the trace ILP.
Trace::getPHIDepth() computes the data dependency depth of a PHI in a
trace successor that isn't necessarily part of the trace.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161711 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineTraceMetrics.h b/lib/CodeGen/MachineTraceMetrics.h
index 4f39aca..c5b86f3 100644
--- a/lib/CodeGen/MachineTraceMetrics.h
+++ b/lib/CodeGen/MachineTraceMetrics.h
@@ -226,6 +226,15 @@
/// When Bottom is set, instructions in the trace center block are included.
unsigned getResourceDepth(bool Bottom) const;
+ /// Return the resource length of the trace. This is the number of cycles
+ /// required to execute the instructions in the trace if they were all
+ /// independent, exposing the maximum instruction-level parallelism.
+ ///
+ /// Any blocks in Extrablocks are included as if they were part of the
+ /// trace.
+ unsigned getResourceLength(ArrayRef<const MachineBasicBlock*> Extrablocks =
+ ArrayRef<const MachineBasicBlock*>()) const;
+
/// Return the length of the (data dependency) critical path through the
/// trace.
unsigned getCriticalPath() const { return TBI.CriticalPath; }
@@ -241,6 +250,10 @@
/// before the critical path becomes longer.
/// MI must be an instruction in the trace center block.
unsigned getInstrSlack(const MachineInstr *MI) const;
+
+ /// Return the Depth of a PHI instruction in a trace center block successor.
+ /// The PHI does not have to be part of the trace.
+ unsigned getPHIDepth(const MachineInstr *PHI) const;
};
/// A trace ensemble is a collection of traces selected using the same