Change if-conversion block size limit checks to add some flexibility.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106901 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 25 insertions, 34 deletions

diff --git a/include/llvm/Target/TargetInstrInfo.h b/include/llvm/Target/TargetInstrInfo.h
index e586a06..2c6080b 100644
--- a/include/llvm/Target/TargetInstrInfo.h
+++ b/include/llvm/Target/TargetInstrInfo.h
@@ -331,6 +331,31 @@ public:
                                    MachineBasicBlock::iterator MBBI) const {
     return true;
   }
+
+  /// isProfitableToIfCvt - Return true if it's profitable to first "NumInstrs"
+  /// of the specified basic block.
+  virtual
+  bool isProfitableToIfCvt(MachineBasicBlock &MBB, unsigned NumInstrs) const {
+    return false;
+  }
+  
+  /// isProfitableToIfCvt - Second variant of isProfitableToIfCvt, this one
+  /// checks for the case where two basic blocks from true and false path
+  /// of a if-then-else (diamond) are predicated on mutally exclusive
+  /// predicates.
+  virtual bool
+  isProfitableToIfCvt(MachineBasicBlock &TMBB, unsigned NumTInstrs,
+                      MachineBasicBlock &FMBB, unsigned NumFInstrs) const {
+    return false;
+  }
+
+  /// isProfitableToDupForIfCvt - Return true if it's profitable for
+  /// if-converter to duplicate a specific number of instructions in the
+  /// specified MBB to enable if-conversion.
+  virtual bool
+  isProfitableToDupForIfCvt(MachineBasicBlock &MBB,unsigned NumInstrs) const {
+    return false;
+  }
   
   /// copyRegToReg - Emit instructions to copy between a pair of registers. It
   /// returns false if the target does not how to copy between the specified
diff --git a/include/llvm/Target/TargetLowering.h b/include/llvm/Target/TargetLowering.h
index 4aa8a4d..eb048f6 100644
--- a/include/llvm/Target/TargetLowering.h
+++ b/include/llvm/Target/TargetLowering.h
@@ -683,19 +683,6 @@ public:
     return JumpBufAlignment;
   }
 
-  /// getIfCvtBlockLimit - returns the target specific if-conversion block size
-  /// limit. Any block whose size is greater should not be predicated.
-  unsigned getIfCvtBlockSizeLimit() const {
-    return IfCvtBlockSizeLimit;
-  }
-
-  /// getIfCvtDupBlockLimit - returns the target specific size limit for a
-  /// block to be considered for duplication. Any block whose size is greater
-  /// should not be duplicated to facilitate its predication.
-  unsigned getIfCvtDupBlockSizeLimit() const {
-    return IfCvtDupBlockSizeLimit;
-  }
-
   /// getPrefLoopAlignment - return the preferred loop alignment.
   ///
   unsigned getPrefLoopAlignment() const {
@@ -1078,19 +1065,6 @@ protected:
     JumpBufAlignment = Align;
   }
 
-  /// setIfCvtBlockSizeLimit - Set the target's if-conversion block size
-  /// limit (in number of instructions); default is 2.
-  void setIfCvtBlockSizeLimit(unsigned Limit) {
-    IfCvtBlockSizeLimit = Limit;
-  }
-
-  /// setIfCvtDupBlockSizeLimit - Set the target's block size limit (in number
-  /// of instructions) to be considered for code duplication during
-  /// if-conversion; default is 2.
-  void setIfCvtDupBlockSizeLimit(unsigned Limit) {
-    IfCvtDupBlockSizeLimit = Limit;
-  }
-
   /// setPrefLoopAlignment - Set the target's preferred loop alignment. Default
   /// alignment is zero, it means the target does not care about loop alignment.
   void setPrefLoopAlignment(unsigned Align) {
@@ -1538,14 +1512,6 @@ private:
   /// buffers
   unsigned JumpBufAlignment;
 
-  /// IfCvtBlockSizeLimit - The maximum allowed size for a block to be
-  /// if-converted.
-  unsigned IfCvtBlockSizeLimit;
-
-  /// IfCvtDupBlockSizeLimit - The maximum allowed size for a block to be
-  /// duplicated during if-conversion.
-  unsigned IfCvtDupBlockSizeLimit;
-
   /// PrefLoopAlignment - The perferred loop alignment.
   ///
   unsigned PrefLoopAlignment;