digit_t is now unsigned, asm division for 1 digit

[ipdf/code.git] / src / vfpu.h

diff --git a/src/vfpu.h b/src/vfpu.h
index 12ac9bc..d77c1e3 100644 (file)
--- a/src/vfpu.h
+++ b/src/vfpu.h
@@ -1,31 +1,19 @@
-#ifndef _VFPU_H
-#define _VFPU_H
-
 /**
- * Implements a terrible and hacky interface to use a virtual FPU to do floating point operations
+ * @file vfpu.h
+ * @brief Implements a terrible and hacky interface to use a virtual FPU to do floating point operations
  */
 
-#include <bitset>
+#ifndef _VFPU_H
+#define _VFPU_H
 
+#include <bitset>
 namespace VFPU
 {
        extern int Start(const char * vcd_output = NULL); // Starts the VFPU
        extern int Halt(); // Halts the VFPU
-
-/**
-               -- 000 = add, 
-               -- 001 = substract, 
-               -- 010 = multiply, 
-               -- 011 = divide,
-               -- 100 = square root
-               -- 101 = unused
-               -- 110 = unused
-               -- 111 = unused
- */
        typedef enum {ADD=0x000, SUB=0x001, MULT=0x010, DIV=0x011, SQRT=0x100} Opcode;
-       typedef enum {EVEN=0x00, ZERO=0x01, UP=0x10, DOWN=0x11} Rmode;
+       typedef enum {EVEN=0x00, ZERO=0x01, UP=0x10, DOWN=0x11} 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
 }