Don't override subreg functions in targets without subregisters.

[oota-llvm.git] / include / llvm / Instruction.h

diff --git a/include/llvm/Instruction.h b/include/llvm/Instruction.h
index 38973b71773c7ef1cd0702a4422e5db03f09ab4d..9c5ac4430f89967b7523f05b81ea544b3d4d0737 100644 (file)
--- a/include/llvm/Instruction.h
+++ b/include/llvm/Instruction.h
@@ -244,26 +244,6 @@ public:
     return mayWriteToMemory() || mayThrow();
   }
 
-  /// isSafeToSpeculativelyExecute - Return true if the instruction does not
-  /// have any effects besides calculating the result and does not have
-  /// undefined behavior.
-  ///
-  /// This method never returns true for an instruction that returns true for
-  /// mayHaveSideEffects; however, this method also does some other checks in
-  /// addition. It checks for undefined behavior, like dividing by zero or
-  /// loading from an invalid pointer (but not for undefined results, like a
-  /// shift with a shift amount larger than the width of the result). It checks
-  /// for malloc and alloca because speculatively executing them might cause a
-  /// memory leak. It also returns false for instructions related to control
-  /// flow, specifically terminators and PHI nodes.
-  ///
-  /// This method only looks at the instruction itself and its operands, so if
-  /// this method returns true, it is safe to move the instruction as long as
-  /// the correct dominance relationships for the operands and users hold.
-  /// However, this method can return true for instructions that read memory;
-  /// for such instructions, moving them may change the resulting value.
-  bool isSafeToSpeculativelyExecute() const;
-
   /// clone() - Create a copy of 'this' instruction that is identical in all
   /// ways except the following:
   ///   * The instruction has no parent