/**
* @file vfpu.h
* @brief Implements a terrible and hacky interface to use a virtual FPU to do floating point operations
+ * Updated with even more terror! Whatever floats the boat!
*/
#ifndef _VFPU_H
{
extern int Start(const char * vcd_output = NULL); // Starts the VFPU
extern int Halt(); // Halts the VFPU
- typedef enum {ADD=0x000, SUB=0x001, MULT=0x010, DIV=0x011, SQRT=0x100} Opcode;
- typedef enum {EVEN=0x00, ZERO=0x01, UP=0x10, DOWN=0x11} Rmode; // Rounding mode; to even, towards zero, always up, always down
+ typedef enum {ADD=0x0, SUB=0x1, MULT=0x2, DIV=0x3, SQRT=0x4} Opcode;
+ typedef enum {EVEN=0x0, ZERO=0x1, UP=0x2, DOWN=0x3} Rmode; // Rounding mode; to even, towards zero, always up, always down
typedef std::bitset<32> Register;
extern Register Exec(const Register & a, const Register & b, Opcode op, Rmode rmode = EVEN); // operate with registers
extern float Exec(float a, float b, Opcode op, Rmode rmode = EVEN); //converts floats into registers and back
+
+ /**
+ * Wrapper class for floats where operations are done on the VFPU
+ */
+ class VFloat
+ {
+ public:
+ VFloat(float f = 0) : m_value(f)
+ {
+ static bool init = false;
+ if (!init)
+ {
+ init = true;
+ VFPU::Start("flops.vcd");
+ }
+ }
+ VFloat(const VFloat & cpy) : m_value(cpy.m_value) {}
+ virtual ~VFloat()
+ {
+
+ }
+
+ VFloat & operator+=(const VFloat & op)
+ {
+ m_value = Exec(m_value, op.m_value, ADD);
+ return *this;
+ }
+ VFloat & operator-=(const VFloat & op)
+ {
+ m_value = Exec(m_value, op.m_value, SUB);
+ return *this;
+ }
+ VFloat & operator*=(const VFloat & op)
+ {
+ m_value = Exec(m_value, op.m_value, MULT);
+ return *this;
+ }
+ VFloat & operator/=(const VFloat & op)
+ {
+ m_value = Exec(m_value, op.m_value, DIV);
+ return *this;
+ }
+
+ VFloat operator+(const VFloat & op) const {VFloat f(*this); f+=op; return f;}
+ VFloat operator-(const VFloat & op) const {VFloat f(*this); f-=op; return f;}
+ VFloat operator*(const VFloat & op) const {VFloat f(*this); f*=op; return f;}
+ VFloat operator/(const VFloat & op) const {VFloat f(*this); f/=op; return f;}
+
+ bool operator==(const VFloat & op) const
+ {
+ VFloat f(op);
+ f -= *this;
+ return (f.m_value == 0);
+ }
+ bool operator!=(const VFloat & op) const {return !this->operator==(op);}
+ bool operator<(const VFloat & op) const
+ {
+ VFloat f(op);
+ f -= *this;
+ return (f.m_value > 0);
+ }
+ bool operator<=(const VFloat & op) const
+ {
+ VFloat f(op);
+ f -= *this;
+ return (f.m_value >= 0);
+ }
+ bool operator>(const VFloat & op) const {return !this->operator<=(op);}
+ bool operator>=(const VFloat & op) const {return !this->operator<(op);}
+
+ float m_value;
+
+ };
}
#endif //_VFPU_H