ref: dca4cd41d41545175457d49a180a12064b804d3b
dir: femtolisp/llt/utils.h
#ifndef __UTILS_H_
#define __UTILS_H_
/* these functions byteswap any-size units --------------------- */
void bswap(byte_t *s, size_t n);
void bswap_to(byte_t *dest, byte_t *src, size_t n);
void bswap_buffer(byte_t *data, size_t sz, size_t npts);
/* ------------------------------------------------------------- */
/* reverse the order of elements of any size, in place or out of place */
/* n is the number of elements */
void memreverse(char *a, size_t n, size_t elsz);
void memreverse_to(char *dest, char *a, size_t n, size_t elsz);
/* swap the contents of two buffers */
void memswap(char *a, char *b, size_t sz);
/* allocating aligned blocks ----------------------------------- */
void *malloc_aligned(size_t size, size_t align_size);
void free_aligned(void *ptr);
void *realloc_aligned(void *ptr, size_t size, size_t align_size);
/* ------------------------------------------------------------- */
int dbl_equals(double a, double b);
int flt_equals(float a, float b);
void dbl_tolerance(double tol);
void flt_tolerance(float tol);
int double_exponent(double d);
double double_mantissa(double d);
int float_exponent(float f);
float float_mantissa(float f);
void snprint_real(char *s, size_t cnt, double r,
int width, // printf field width, or 0
int dec, // # decimal digits desired, recommend 16
// # of zeros in .00...0x before using scientific notation
// recommend 3-4 or so
int max_digs_rt,
// # of digits left of decimal before scientific notation
// recommend 10
int max_digs_lf);
void snprint_cplx(char *s, size_t cnt, double re, double im,
// args to pass on to snprint_real
int width, int dec,
int max_digs_rt, int max_digs_lf,
// print spaces around sign in a+bi
int spflag);
char *uint2str(char *dest, size_t len, uint64_t num, uint32_t base);
int str2int(char *str, size_t len, int64_t *res, uint32_t base);
int isdigit_base(char c, int base);
extern double trunc(double x);
STATIC_INLINE double fpart(double arg)
{
return arg - trunc(arg);
}
#define ipart(x) trunc(x)
numerictype_t effective_numerictype(double r);
double conv_to_double(void *data, numerictype_t tag);
void conv_from_double(void *data, double d, numerictype_t tag);
int64_t conv_to_int64(void *data, numerictype_t tag);
uint64_t conv_to_uint64(void *data, numerictype_t tag);
int32_t conv_to_int32(void *data, numerictype_t tag);
uint32_t conv_to_uint32(void *data, numerictype_t tag);
#ifdef BITS64
#define conv_to_long conv_to_int64
#define conv_to_ulong conv_to_uint64
#else
#define conv_to_long conv_to_int32
#define conv_to_ulong conv_to_uint32
#endif
int cmp_same_lt(void *a, void *b, numerictype_t tag);
int cmp_same_eq(void *a, void *b, numerictype_t tag);
int cmp_lt(void *a, numerictype_t atag, void *b, numerictype_t btag);
int cmp_eq(void *a, numerictype_t atag, void *b, numerictype_t btag,
int equalnans);
#ifdef ARCH_X86_64
# define LEGACY_REGS "=Q"
#else
# define LEGACY_REGS "=q"
#endif
#if !defined(__INTEL_COMPILER) && (defined(ARCH_X86) || defined(ARCH_X86_64))
STATIC_INLINE u_int16_t ByteSwap16(u_int16_t x)
{
__asm("xchgb %b0,%h0" :
LEGACY_REGS (x) :
"0" (x));
return x;
}
#define bswap_16(x) ByteSwap16(x)
STATIC_INLINE u_int32_t ByteSwap32(u_int32_t x)
{
#if __CPU__ > 386
__asm("bswap %0":
"=r" (x) :
#else
__asm("xchgb %b0,%h0\n"\
" rorl $16,%0\n"
" xchgb %b0,%h0":
LEGACY_REGS (x) :
#endif
"0" (x));
return x;
}
#define bswap_32(x) ByteSwap32(x)
STATIC_INLINE u_int64_t ByteSwap64(u_int64_t x)
{
#ifdef ARCH_X86_64
__asm("bswap %0":
"=r" (x) :
"0" (x));
return x;
#else
register union { __extension__ u_int64_t __ll;
u_int32_t __l[2]; } __x;
asm("xchgl %0,%1":
"=r"(__x.__l[0]),"=r"(__x.__l[1]):
"0"(bswap_32((unsigned long)x)),"1"(bswap_32((unsigned long)(x>>32))));
return __x.__ll;
#endif
}
#define bswap_64(x) ByteSwap64(x)
#else
#define bswap_16(x) (((x) & 0x00ff) << 8 | ((x) & 0xff00) >> 8)
#ifdef __INTEL_COMPILER
#define bswap_32(x) _bswap(x)
#else
#define bswap_32(x) \
((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \
(((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))
#endif
STATIC_INLINE u_int64_t ByteSwap64(u_int64_t x)
{
union {
u_int64_t ll;
u_int32_t l[2];
} w, r;
w.ll = x;
r.l[0] = bswap_32 (w.l[1]);
r.l[1] = bswap_32 (w.l[0]);
return r.ll;
}
#define bswap_64(x) ByteSwap64(x)
#endif
#endif