Added MispredictPenalty to SchedMachineModel.

This replaces an existing subtarget hook on ARM and allows standard
CodeGen passes to potentially use the property.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161471 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 9 insertions, 2 deletions

diff --git a/include/llvm/MC/MCSchedule.h b/include/llvm/MC/MCSchedule.h
index 626accb86b..3b1cdf1cd2 100644
--- a/include/llvm/MC/MCSchedule.h
+++ b/include/llvm/MC/MCSchedule.h
@@ -78,6 +78,11 @@ public:
   unsigned HighLatency;
   static const unsigned DefaultHighLatency = 10;
 
+  // MispredictPenalty is the typical number of extra cycles the processor
+  // takes to recover from a branch misprediction.
+  unsigned MispredictPenalty;
+  static const unsigned DefaultMispredictPenalty = 10;
+
 private:
   // TODO: Add a reference to proc resource types and sched resource tables.
 
@@ -94,13 +99,14 @@ public:
                   MinLatency(DefaultMinLatency),
                   LoadLatency(DefaultLoadLatency),
                   HighLatency(DefaultHighLatency),
+                  MispredictPenalty(DefaultMispredictPenalty),
                   InstrItineraries(0) {}
 
   // Table-gen driven ctor.
-  MCSchedModel(unsigned iw, int ml, unsigned ll, unsigned hl,
+  MCSchedModel(unsigned iw, int ml, unsigned ll, unsigned hl, unsigned mp,
                const InstrItinerary *ii):
     IssueWidth(iw), MinLatency(ml), LoadLatency(ll), HighLatency(hl),
-    InstrItineraries(ii){}
+    MispredictPenalty(mp), InstrItineraries(ii){}
 };
 
 } // End llvm namespace
diff --git a/include/llvm/Target/TargetSchedule.td b/include/llvm/Target/TargetSchedule.td
index 5bbed58c87..4dc488dbae 100644
--- a/include/llvm/Target/TargetSchedule.td
+++ b/include/llvm/Target/TargetSchedule.td
@@ -27,6 +27,7 @@ class SchedMachineModel {
                        // (-1) inorder (0) ooo, (1): inorder +var latencies.
   int LoadLatency = -1; // Cycles for loads to access the cache.
   int HighLatency = -1; // Approximation of cycles for "high latency" ops.
+  int MispredictPenalty = -1; // Extra cycles for a mispredicted branch.
 
   ProcessorItineraries Itineraries = NoItineraries;