1 files changed, 20 insertions, 8 deletions
diff --git a/llvm/lib/Target/PowerPC/PPCInstrInfo.h b/llvm/lib/Target/PowerPC/PPCInstrInfo.h
index 13eecdff558..5150650439b 100644
--- a/llvm/lib/Target/PowerPC/PPCInstrInfo.h
+++ b/llvm/lib/Target/PowerPC/PPCInstrInfo.h
@@ -486,14 +486,26 @@ public:
   /// On PPC, we have two instructions used to set-up the hardware loop
   /// (MTCTRloop, MTCTR8loop) with corresponding endloop (BDNZ, BDNZ8)
   /// instructions to indicate the end of a loop.
-  MachineInstr *
-  findLoopInstr(MachineBasicBlock &PreHeader,
-                SmallPtrSet<MachineBasicBlock *, 8> &Visited) const;
-
-  /// Analyze loop L, which must be a single-basic-block loop, and if the
-  /// conditions can be understood enough produce a PipelinerLoopInfo object.
-  std::unique_ptr<TargetInstrInfo::PipelinerLoopInfo>
-  analyzeLoopForPipelining(MachineBasicBlock *LoopBB) const override;
+  MachineInstr *findLoopInstr(MachineBasicBlock &PreHeader) const;
+
+  /// Analyze the loop code to find the loop induction variable and compare used
+  /// to compute the number of iterations. Currently, we analyze loop that are
+  /// controlled using hardware loops.  In this case, the induction variable
+  /// instruction is null.  For all other cases, this function returns true,
+  /// which means we're unable to analyze it. \p IndVarInst and \p CmpInst will
+  /// return new values when we can analyze the readonly loop \p L, otherwise,
+  /// nothing got changed
+  bool analyzeLoop(MachineLoop &L, MachineInstr *&IndVarInst,
+                   MachineInstr *&CmpInst) const override;
+  /// Generate code to reduce the loop iteration by one and check if the loop
+  /// is finished.  Return the value/register of the new loop count.  We need
+  /// this function when peeling off one or more iterations of a loop. This
+  /// function assumes the last iteration is peeled first.
+  unsigned reduceLoopCount(MachineBasicBlock &MBB, MachineBasicBlock &PreHeader,
+                           MachineInstr *IndVar, MachineInstr &Cmp,
+                           SmallVectorImpl<MachineOperand> &Cond,
+                           SmallVectorImpl<MachineInstr *> &PrevInsts,
+                           unsigned Iter, unsigned MaxIter) const override;
 };
 
 }