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refactor fixed-point.h to match style standards

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This commit is contained in:
EDiasAlberto
2024-10-24 20:16:40 +01:00
parent e749936b1f
commit 49a9284f02
2 changed files with 30 additions and 25 deletions
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51
src/threads/fixed-point.h
View File

@@ -3,37 +3,40 @@
#define FIXED_POINT_H
typedef struct
{
{
int32_t raw;
} fp32_t;
} fp32_t;
/* Fixed Point Arithmetic bit count constants */
#define NUM_FRAC_BITS 14
#define NUM_INT_BITS (31 - NUM_FRAC_BITS)
#define CONVERSION_CONST (1 << NUM_FRAC_BITS) /* f = 2^q, (2^20) */
#define CONVERSION_FACTOR (1 << NUM_FRAC_BITS) /* f = 2^q, (2^14) */
/* Fixed Point Arithmetic conversion operations */
/* Converts an integer n to a fixed point number */
inline fp32_t
int_to_fp (int32_t n)
fp_from_int (int32_t n)
{
return (fp32_t){ n * CONVERSION_CONST };
return (fp32_t){ n * CONVERSION_FACTOR };
}
/* Handles conversion of fixed point to integer. First version truncates, second one rounds */
/* Handles conversion of fixed point to integer,
with truncation */
inline int32_t
fp_floor (fp32_t x)
{
return x.raw / CONVERSION_CONST;
return x.raw / CONVERSION_FACTOR;
}
/* Handles conversion of fixed point to integer,
with rounding */
inline int32_t
fp_round (fp32_t x)
{
if (x.raw >= 0)
return (x.raw + CONVERSION_CONST / 2) / CONVERSION_CONST;
return (x.raw + CONVERSION_FACTOR / 2) / CONVERSION_FACTOR;
else
return (x.raw - CONVERSION_CONST / 2) / CONVERSION_CONST;
return (x.raw - CONVERSION_FACTOR / 2) / CONVERSION_FACTOR;
}
/* Add two fixed points */
@@ -50,32 +53,20 @@ fp_sub (fp32_t x, fp32_t y)
return (fp32_t){ x.raw - y.raw };
}
/* Add fixed point to integer */
inline fp32_t
fp_add_int (fp32_t x, int32_t n)
{
return (fp32_t){ x.raw + n * CONVERSION_CONST };
}
/* Subtract integer from fixed point */
inline fp32_t
fp_sub_int (fp32_t x, int32_t n)
{
return (fp32_t){ x.raw - n * CONVERSION_CONST };
}
/* Multiple two fixed points */
inline fp32_t
fp_mul (fp32_t x, fp32_t y)
{
return (fp32_t){ ((int64_t)x.raw) * y.raw / CONVERSION_CONST };
return (fp32_t){ ((int64_t)x.raw) * y.raw / CONVERSION_FACTOR };
}
/* Divide two fixed points */
inline fp32_t
fp_div (fp32_t x, fp32_t y)
{
return (fp32_t){ ((int64_t)x.raw) * CONVERSION_CONST / y.raw };
return (fp32_t){ ((int64_t)x.raw) * CONVERSION_FACTOR / y.raw };
}
/* Multiply fixed point and integer */
@@ -92,4 +83,18 @@ fp_div_int (fp32_t x, int32_t n)
return (fp32_t){ x.raw / n };
}
/* Add fixed point to integer */
inline fp32_t
fp_add_int (fp32_t x, int32_t n)
{
return (fp32_t){ x.raw + n * CONVERSION_FACTOR };
}
/* Subtract integer from fixed point */
inline fp32_t
fp_sub_int (fp32_t x, int32_t n)
{
return (fp32_t){ x.raw - n * CONVERSION_FACTOR };
}
#endif //FIXED_POINT_H

2
src/threads/thread.c
View File

@@ -163,7 +163,7 @@ thread_tick (void)
if (t != idle_thread)
ready++;
fp32_t old_coeff = fp_div_int (fp_mul_int(load_avg, 59), 60);
fp32_t new_coeff = fp_div_int (int_to_fp (ready), 60);
fp32_t new_coeff = fp_div_int (fp_from_int (ready), 60);
load_avg = fp_add (old_coeff, new_coeff);
thread_foreach (thread_update_recent_cpu, NULL);