Hexagon: Honor __builtin_expect by using branch probabilities.

  * lib/Target/Hexagon/HexagonInstrInfo.cpp (GetDotNewPredOp):
  Given a jump opcode return the right pred.new jump opcode with
  a taken vs not-taken hint based on branch probabilities provided
  by the target independent module.
  * lib/Target/Hexagon/HexagonVLIWPacketizer.cpp: Use the above function.
  * lib/Target/Hexagon/HexagonNewValueJump.cpp(getNewvalueJumpOpcode):
  Enhance existing function use branch probabilities like
  HexagonInstrInfo::GetDotNewPredOp but for New Value (GPR) Jumps.

llvm-svn: 180923

1 files changed, 3 insertions, 2 deletions

diff --git a/llvm/lib/Target/Hexagon/HexagonInstrInfo.h b/llvm/lib/Target/Hexagon/HexagonInstrInfo.h
index 03a8a77a33a..e0bec04e64f 100644
--- a/llvm/lib/Target/Hexagon/HexagonInstrInfo.h
+++ b/llvm/lib/Target/Hexagon/HexagonInstrInfo.h
@@ -18,8 +18,7 @@
 #include "MCTargetDesc/HexagonBaseInfo.h"
 #include "llvm/Target/TargetInstrInfo.h"
 #include "llvm/Target/TargetFrameLowering.h"
-#include "llvm/Target/TargetInstrInfo.h"
-
+#include "llvm/CodeGen/MachineBranchProbabilityInfo.h"
 
 #define GET_INSTRINFO_HEADER
 #include "HexagonGenInstrInfo.inc"
@@ -192,6 +191,8 @@ public:
 
   void immediateExtend(MachineInstr *MI) const;
   bool isConstExtended(MachineInstr *MI) const;
+  int getDotNewPredJumpOp(MachineInstr *MI,
+                      const MachineBranchProbabilityInfo *MBPI) const;
   unsigned getAddrMode(const MachineInstr* MI) const;
   bool isOperandExtended(const MachineInstr *MI,
                          unsigned short OperandNum) const;