display/include/fixed31_32.h

85  * result = arg
87 static inline struct fixed31_32 dc_fixpt_from_int(int arg)
91 	res.value = (long long) arg << FIXED31_32_BITS_PER_FRACTIONAL_PART;
103  * result = -arg
105 static inline struct fixed31_32 dc_fixpt_neg(struct fixed31_32 arg)
109 	res.value = -arg.value;
116  * result = abs(arg) := (arg >= 0) ? arg : -arg
118 static inline struct fixed31_32 dc_fixpt_abs(struct fixed31_32 arg)
120 	if (arg.value < 0)
121 		return dc_fixpt_neg(arg);
123 		return arg;
184  *          | min_value, when arg <= min_value
185  * result = | arg, when min_value < arg < max_value
186  *          | max_value, when arg >= max_value
189 	struct fixed31_32 arg,
193 	if (dc_fixpt_le(arg, min_value))
195 	else if (dc_fixpt_le(max_value, arg))
198 		return arg;
208  * result = arg << shift
210 static inline struct fixed31_32 dc_fixpt_shl(struct fixed31_32 arg, unsigned char shift)
212 	ASSERT(((arg.value >= 0) && (arg.value <= LLONG_MAX >> shift)) ||
213 		((arg.value < 0) && (arg.value >= ~(LLONG_MAX >> shift))));
215 	arg.value = arg.value << shift;
217 	return arg;
222  * result = arg >> shift
224 static inline struct fixed31_32 dc_fixpt_shr(struct fixed31_32 arg, unsigned char shift)
226 	bool negative = arg.value < 0;
229 		arg.value = -arg.value;
230 	arg.value = arg.value >> shift;
232 		arg.value = -arg.value;
233 	return arg;
315  * result = square(arg) := arg * arg
317 struct fixed31_32 dc_fixpt_sqr(struct fixed31_32 arg);
344  * result = reciprocal(arg) := 1 / arg
349 struct fixed31_32 dc_fixpt_recip(struct fixed31_32 arg);
358  * result = sinc(arg) := sin(arg) / arg
364 struct fixed31_32 dc_fixpt_sinc(struct fixed31_32 arg);
368  * result = sin(arg)
374 struct fixed31_32 dc_fixpt_sin(struct fixed31_32 arg);
378  * result = cos(arg)
386 struct fixed31_32 dc_fixpt_cos(struct fixed31_32 arg);
395  * result = exp(arg)
398  * Currently, function is verified for abs(arg) <= 1.
400 struct fixed31_32 dc_fixpt_exp(struct fixed31_32 arg);
404  * result = log(arg)
407  * Currently, abs(arg) should be less than 1.
412 struct fixed31_32 dc_fixpt_log(struct fixed31_32 arg);
444  * result = floor(arg) := greatest integer lower than or equal to arg
446 static inline int dc_fixpt_floor(struct fixed31_32 arg)
448 	unsigned long long arg_value = arg.value > 0 ? arg.value : -arg.value;
450 	if (arg.value >= 0)
458  * result = round(arg) := integer nearest to arg
460 static inline int dc_fixpt_round(struct fixed31_32 arg)
462 	unsigned long long arg_value = arg.value > 0 ? arg.value : -arg.value;
470 	if (arg.value >= 0)
478  * result = ceil(arg) := lowest integer greater than or equal to arg
480 static inline int dc_fixpt_ceil(struct fixed31_32 arg)
482 	unsigned long long arg_value = arg.value > 0 ? arg.value : -arg.value;
491 	if (arg.value >= 0)
503 unsigned int dc_fixpt_u4d19(struct fixed31_32 arg);
505 unsigned int dc_fixpt_u3d19(struct fixed31_32 arg);
507 unsigned int dc_fixpt_u2d19(struct fixed31_32 arg);
509 unsigned int dc_fixpt_u0d19(struct fixed31_32 arg);
511 unsigned int dc_fixpt_clamp_u0d14(struct fixed31_32 arg);
513 unsigned int dc_fixpt_clamp_u0d10(struct fixed31_32 arg);
515 int dc_fixpt_s4d19(struct fixed31_32 arg);
517 static inline struct fixed31_32 dc_fixpt_truncate(struct fixed31_32 arg, unsigned int frac_bits)
519 	bool negative = arg.value < 0;
523 		return arg;
527 		arg.value = -arg.value;
528 	arg.value &= (~0ULL) << (FIXED31_32_BITS_PER_FRACTIONAL_PART - frac_bits);
530 		arg.value = -arg.value;
531 	return arg;