ARM32 Vector lowering - scalarize select

src/IceUtils.h

 //===- subzero/src/IceUtils.h - Utility functions ---------------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 105 matching lines @@
   return (value >> shift) | (value << (32 - shift));
 }
 
 /// Returns true if Val is +0.0. It requires T to be a floating point type.
 template <typename T> static bool isPositiveZero(T Val) {
   static_assert(std::is_floating_point<T>::value,
                 "Input type must be floating point");
   return Val == 0 && !std::signbit(Val);
 }
 
+/// A helper class to ensure that a boolean flag is restored to its previous

[Jim Stichnoth, 2016/02/13 05:22:09]

Could you add "RAII" to the comment somewhere?  That should help people (like
me) find it more easily in the future.

[Eric Holk, 2016/02/16 23:05:30]

Sure.

+/// value upon function exist.
+///
+/// Used in places like RandomizationPoolingPause and generating target helper
+/// calls.
+class BoolFlagSaver {
+  BoolFlagSaver() = delete;
+  BoolFlagSaver(const BoolFlagSaver &) = delete;
+  BoolFlagSaver &operator=(const BoolFlagSaver &) = delete;
+
+public:
+  BoolFlagSaver(bool &F, bool NewValue) : OldValue(F), Flag(F) { F = NewValue; }
+  ~BoolFlagSaver() { Flag = OldValue; }
+
+private:
+  const bool OldValue;
+  bool &Flag;
+};
+
 } // end of namespace Utils
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEUTILS_H