Keep track of the head and tail of the trace through each block.
This makes it possible to quickly detect blocks that are outside the
trace.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160904 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineTraceMetrics.h b/lib/CodeGen/MachineTraceMetrics.h
index 086d7ea..26136fa 100644
--- a/lib/CodeGen/MachineTraceMetrics.h
+++ b/lib/CodeGen/MachineTraceMetrics.h
@@ -110,6 +110,12 @@
/// Trace successor, or NULL for the last block in the trace.
const MachineBasicBlock *Succ;
+ /// The block number of the head of the trace. (When hasValidDepth()).
+ unsigned Head;
+
+ /// The block number of the tail of the trace. (When hasValidHeight()).
+ unsigned Tail;
+
/// Accumulated number of instructions in the trace above this block.
/// Does not include instructions in this block.
unsigned InstrDepth;