useful.h File Reference

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Macros
#define	GPR_MIN(a, b)   ((a) < (b) ? (a) : (b))
#define	GPR_MAX(a, b)   ((a) > (b) ? (a) : (b))
#define	GPR_CLAMP(a, min, max)   ((a) < (min) ? (min) : (a) > (max) ? (max) : (a))
#define	GPR_ROTL(x, n)   (((x) << (n)) | ((x) >> (sizeof(x) * 8 - (n))))
#define	GPR_ROTR(x, n)   (((x) >> (n)) | ((x) << (sizeof(x) * 8 - (n))))
#define	GPR_ARRAY_SIZE(array)   (sizeof(array) / sizeof(*(array)))
#define	GPR_SWAP(type, a, b)
#define	GPR_BITSET(i, n)   ((*(i)) |= (1u << (n)))
	Set the n-th bit of i (a mutable pointer). More...
#define	GPR_BITCLEAR(i, n)   ((*(i)) &= ~(1u << (n)))
	Clear the n-th bit of i (a mutable pointer). More...
#define	GPR_BITGET(i, n)   (((i) & (1u << (n))) != 0)
	Get the n-th bit of i. More...
#define	GPR_INTERNAL_HEXDIGIT_BITCOUNT(x)
#define	GPR_BITCOUNT(i)
	Returns number of bits set in bitset i. More...

Macro Definition Documentation

#define GPR_ARRAY_SIZE

(

array

)

(sizeof(array) / sizeof(*(array)))

#define GPR_BITCLEAR	(		i,
			n
	)		((*(i)) &= ~(1u << (n)))

Clear the n-th bit of i (a mutable pointer).

#define GPR_BITCOUNT

(

i

)

Value:

(((GPR_INTERNAL_HEXDIGIT_BITCOUNT(i) +         \
     (GPR_INTERNAL_HEXDIGIT_BITCOUNT(i) >> 4)) & \
    0x0f0f0f0f) %                                \
   255)

Returns number of bits set in bitset i.

#define GPR_BITGET	(		i,
			n
	)		(((i) & (1u << (n))) != 0)

Get the n-th bit of i.

#define GPR_BITSET	(		i,
			n
	)		((*(i)) |= (1u << (n)))

Set the n-th bit of i (a mutable pointer).

#define GPR_CLAMP	(		a,
			min,
			max
	)		((a) < (min) ? (min) : (a) > (max) ? (max) : (a))

#define GPR_INTERNAL_HEXDIGIT_BITCOUNT

(

x

)

Value:

((x) - (((x) >> 1) & 0x77777777) - (((x) >> 2) & 0x33333333) - \
   (((x) >> 3) & 0x11111111))

#define GPR_MAX	(		a,
			b
	)		((a) > (b) ? (a) : (b))

#define GPR_MIN	(		a,
			b
	)		((a) < (b) ? (a) : (b))

#define GPR_ROTL	(		x,
			n
	)		(((x) << (n)) | ((x) >> (sizeof(x) * 8 - (n))))

#define GPR_ROTR	(		x,
			n
	)		(((x) >> (n)) | ((x) << (sizeof(x) * 8 - (n))))

#define GPR_SWAP	(		type,
			a,
			b
	)

Value:

do {                       \
    type x = a;              \
    a = b;                   \
    b = x;                   \
  } while (0)