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flyingfish89
2022-12-12 17:11:58 +08:00
committed by Xiang Xiao
parent e57d0312ca
commit 035656661e
4 changed files with 316 additions and 1 deletions
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libs/libc/math/Make.defs
+1 -1
View File
@@ -27,7 +27,7 @@ CSRCS += lib_coshf.c lib_expf.c lib_fabsf.c lib_fmodf.c lib_frexpf.c
CSRCS += lib_ldexpf.c lib_logf.c lib_log10f.c lib_log2f.c lib_modff.c
CSRCS += lib_powf.c lib_sinf.c lib_sinhf.c lib_sqrtf.c lib_tanf.c
CSRCS += lib_tanhf.c lib_asinhf.c lib_acoshf.c lib_atanhf.c lib_erff.c
CSRCS += lib_copysignf.c
CSRCS += lib_copysignf.c lib_scalbnf.c lib_scalbn.c lib_scalbnl.c
CSRCS += lib_acos.c lib_asin.c lib_atan.c lib_atan2.c lib_cos.c
CSRCS += lib_cosh.c lib_exp.c lib_fabs.c lib_fmod.c lib_frexp.c
libs/libc/math/lib_scalbn.c
Executable
+88
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@@ -0,0 +1,88 @@
/****************************************************************************
* libs/libc/math/lib_scalbn.c
* get a double number of x*2^n
*
* This file is copy from musl libc
* musl is an implementation of the C standard library built on top of the
* Linux system call API, including interfaces defined in the base language
* standard, POSIX, and widely agreed-upon extensions.
* musl is lightweight, fast, simple, free, and strives to be correct in
* the sense of standards-conformance and safety.
*
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <math.h>
#include <stdint.h>
/****************************************************************************
* Pre-processor definitions
****************************************************************************/
#ifdef CONFIG_HAVE_DOUBLE
#define DOUBLE_MIN (0x1p-1022)
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: scalbn
*
* Description:
* get a double number of x*2^n
*
****************************************************************************/
double scalbn(double x, int n)
{
union
{
double f;
uint64_t i;
}u;
double_t y = x;
if (n > 1023)
{
y *= 0x1p1023;
n -= 1023;
if (n > 1023)
{
y *= 0x1p1023;
n -= 1023;
if (n > 1023)
{
n = 1023;
}
}
}
else if (n < -1022)
{
/* make sure final n < -53 to avoid double
* rounding in the subnormal range
*/
y *= DOUBLE_MIN * 0x1p53;
n += 1022 - 53;
if (n < -1022)
{
y *= DOUBLE_MIN * 0x1p53;
n += 1022 - 53;
if (n < -1022)
{
n = -1022;
}
}
}
u.i = (uint64_t)(0x3ff + n) << 52;
x = y * u.f;
return x;
}
#endif /* CONFIG_HAVE_DOUBLE */
libs/libc/math/lib_scalbnf.c
Executable
+83
View File
@@ -0,0 +1,83 @@
/****************************************************************************
* libs/libc/math/lib_scalbnf.c
* get a float number of x*2^n
*
* This file is copy from musl libc
* musl is an implementation of the C standard library built on top of the
* Linux system call API, including interfaces defined in the base language
* standard, POSIX, and widely agreed-upon extensions.
* musl is lightweight, fast, simple, free, and strives to be correct in
* the sense of standards-conformance and safety.
*
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <math.h>
#include <stdint.h>
/****************************************************************************
* Pre-processor definitions
****************************************************************************/
#define FLT_MIN (0x1p-126f)
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: scalbnf
*
* Description:
* get a float number of x*2^n
*
****************************************************************************/
float scalbnf(float x, int n)
{
union
{
float f;
uint32_t i;
}u;
float_t y = x;
if (n > 127)
{
y *= 0x1p127f;
n -= 127;
if (n > 127)
{
y *= 0x1p127f;
n -= 127;
if (n > 127)
{
n = 127;
}
}
}
else if (n < -126)
{
y *= FLT_MIN * 0x1p24f;
n += 126 - 24;
if (n < -126)
{
y *= FLT_MIN * 0x1p24f;
n += 126 - 24;
if (n < -126)
{
n = -126;
}
}
}
u.i = (uint32_t)(0x7f + n) << 23;
x = y * u.f;
return x;
}
libs/libc/math/lib_scalbnl.c
+144
View File
@@ -0,0 +1,144 @@
/****************************************************************************
* libs/libc/math/lib_scalbnl.c
* get a long double number of x*2^n
*
* This file is copy from musl libc
* musl is an implementation of the C standard library built on top of the
* Linux system call API, including interfaces defined in the base language
* standard, POSIX, and widely agreed-upon extensions.
* musl is lightweight, fast, simple, free, and strives to be correct in
* the sense of standards-conformance and safety.
*
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <math.h>
#include <stdint.h>
#include <endian.h>
#include <float.h>
/****************************************************************************
* Pre-processor definitions
****************************************************************************/
#ifdef CONFIG_HAVE_LONG_DOUBLE
#define LDOUBLE_MIN (0x1p-16382l)
#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384 && __BYTE_ORDER == __LITTLE_ENDIAN
union ldshape
{
long double f;
struct
{
uint64_t m;
uint16_t se;
}i;
};
#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384 && __BYTE_ORDER == __BIG_ENDIAN
/* This is the m68k variant of 80-bit long double,
* and this definition only works on archs where
* the alignment requirement of uint64_t is <= 4.
*/
union ldshape
{
long double f;
struct
{
uint16_t se;
uint16_t pad;
uint64_t m;
}i;
};
#elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384 && __BYTE_ORDER == __LITTLE_ENDIAN
union ldshape
{
long double f;
struct
{
uint64_t lo;
uint32_t mid;
uint16_t top;
uint16_t se;
}i;
};
#elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384 && __BYTE_ORDER == __BIG_ENDIAN
union ldshape
{
long double f;
struct
{
uint16_t se;
uint16_t top;
uint32_t mid;
uint64_t lo;
}i;
};
#else
#error Unsupported long double representation
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: scalbnl
*
* Description:
* get a long double number of x*2^n
*
****************************************************************************/
#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
long double scalbnl(long double x, int n)
{
return scalbn(x, n);
}
#elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
long double scalbnl(long double x, int n)
{
union ldshape u;
if (n > 16383)
{
x *= 0x1p16383l;
n -= 16383;
if (n > 16383)
{
x *= 0x1p16383l;
n -= 16383;
if (n > 16383)
{
n = 16383;
}
}
}
else if (n < -16382)
{
x *= LDOUBLE_MIN * 0x1p113l;
n += 16382 - 113;
if (n < -16382)
{
x *= LDOUBLE_MIN * 0x1p113l;
n += 16382 - 113;
if (n < -16382)
{
n = -16382;
}
}
}
u.f = 1.0;
u.i.se = 0x3fff + n;
return x * u.f;
}
#endif /* LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024 */
#endif /* CONFIG_HAVE_LONG_DOUBLE */