core/fpu_ctrl.h

   1 #ifndef CORE_FPU_CTRL_H
   2 #define CORE_FPU_CTRL_H
   3
   4 class FPUCtl {
   5     unsigned int sse_state{};
   6     bool in_mode{};
   7
   8     static unsigned int Set() noexcept;
   9     static void Reset(unsigned int state) noexcept;
  10
  11 public:
  12     FPUCtl() noexcept : sse_state{Set()}, in_mode{true} { }
  13     ~FPUCtl() { if(in_mode) Reset(sse_state); }
  14
  15     FPUCtl(const FPUCtl&) = delete;
  16     FPUCtl& operator=(const FPUCtl&) = delete;
  17
  18     void enter() noexcept
  19     {
  20         if(!in_mode)
  21             sse_state = Set();
  22         in_mode = true;
  23     }
  24     void leave() noexcept
  25     {
  26         if(in_mode)
  27             Reset(sse_state);
  28         in_mode = false;
  29     }
  30 };
  31
  32 #endif /* CORE_FPU_CTRL_H */