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comment fixed point arithmetic header

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This commit is contained in:
EDiasAlberto
2024-10-15 15:34:06 +01:00
parent 724b6065f7
commit 5178b72370
1 changed files with 6 additions and 1 deletions
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7
src/threads/fixed-point.h
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@@ -7,20 +7,25 @@
#define CONVERSION_CONST (1 << NUM_FRAC_BITS) /* f = 2^q, (2^20) */ #define CONVERSION_CONST (1 << NUM_FRAC_BITS) /* f = 2^q, (2^20) */
/* Fixed Point Arithmetic conversion operations */ /* Fixed Point Arithmetic conversion operations */
/* Converts an integer n to a fixed point number */
#define INT_TO_FP(n) ((n) * (CONVERSION_CONST)) #define INT_TO_FP(n) ((n) * (CONVERSION_CONST))
/* Handles conversion of fixed point to integer. First version truncates, second one rounds */
#define FLOOR_FP_TO_INT(x) ((x) / (CONVERSION_CONST)) #define FLOOR_FP_TO_INT(x) ((x) / (CONVERSION_CONST))
#define ROUNDING_FP_TO_INT(x) ((x) >= 0 ? ((x) + ((CONVERSION_CONST) / 2)) : ((x) - ((CONVERSION_CONST) / 2)) #define ROUNDING_FP_TO_INT(x) ((x) >= 0 ? ((x) + ((CONVERSION_CONST) / 2)) : ((x) - ((CONVERSION_CONST) / 2))
/* Fixed Point Arithmetic addition operations */ /* Fixed Point Arithmetic addition operations */
#define FP_ADD(x, y) ((x) + (y)) #define FP_ADD(x, y) ((x) + (y))
#define FP_SUBTRACT(x, y) ((x) - (y)) #define FP_SUBTRACT(x, y) ((x) - (y))
/* Addition and Subtraction but between a fixed point and an integer */
#define FP_ADD_INT(x, n) ((x) + ((n) * (CONVERSION_CONST))) #define FP_ADD_INT(x, n) ((x) + ((n) * (CONVERSION_CONST)))
#define FP_SUBTRACT_INT(x, n) ((x) - ((n) * (CONVERSION_CONST))) #define FP_SUBTRACT_INT(x, n) ((x) - ((n) * (CONVERSION_CONST)))
/* Fixed Point Arithmetic multiplication operations */ /* Fixed Point Arithmetic multiplication operations */
#define FP_MULTIPLY(x, y) ((int64_t)(x)) * (y) / (CONVERSION_CONST) #define FP_MULTIPLY(x, y) ((int64_t)(x)) * (y) / (CONVERSION_CONST)
#define FP_MULTIPLY_INT(x, n) ((x) * (n))
#define FP_DIVIDE(x, y) ((int64_t)(x)) * (CONVERSION_CONST) / (y) #define FP_DIVIDE(x, y) ((int64_t)(x)) * (CONVERSION_CONST) / (y)
/* Multiplication and division but between a fixed point and an integer */
#define FP_MULTIPLY_INT(x, n) ((x) * (n))
#define FP_DIVIDE_INT(x, n) ((x) / (n)) #define FP_DIVIDE_INT(x, n) ((x) / (n))
#endif //FIXED_POINT_H #endif //FIXED_POINT_H