diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/libm/math.c | 2 | ||||
| -rw-r--r-- | lib/libm/sf_frexp.c | 70 | ||||
| -rw-r--r-- | lib/libm/sf_modf.c | 82 |
3 files changed, 152 insertions, 2 deletions
diff --git a/lib/libm/math.c b/lib/libm/math.c index 0998de227a..d5b6164a49 100644 --- a/lib/libm/math.c +++ b/lib/libm/math.c @@ -122,8 +122,6 @@ float tgammaf(float x) { return 0.0; } float lgammaf(float x) { return 0.0; } float erff(float x) { return 0.0; } float erfcf(float x) { return 0.0; } -float modff(float x, float *y) { return 0.0; } -float frexpf(float x, int *exp) { return 0.0; } float ldexpf(float x, int exp) { return 0.0; } /*****************************************************************************/ diff --git a/lib/libm/sf_frexp.c b/lib/libm/sf_frexp.c new file mode 100644 index 0000000000..397373fdeb --- /dev/null +++ b/lib/libm/sf_frexp.c @@ -0,0 +1,70 @@ +/* + * This file is part of the Micro Python project, http://micropython.org/ + * + * These math functions are taken from newlib-nano-2, the newlib/libm/math + * directory, available from https://github.com/32bitmicro/newlib-nano-2. + * + * Appropriate copyright headers are reproduced below. + */ + +/* sf_frexp.c -- float version of s_frexp.c. + * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. + */ + +/* + * ==================================================== + * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. + * + * Developed at SunPro, a Sun Microsystems, Inc. business. + * Permission to use, copy, modify, and distribute this + * software is freely granted, provided that this notice + * is preserved. + * ==================================================== + */ + +#include "fdlibm.h" + +#ifdef __STDC__ +static const float +#else +static float +#endif +two25 = 3.3554432000e+07; /* 0x4c000000 */ + +#ifdef __STDC__ + float frexpf(float x, int *eptr) +#else + float frexpf(x, eptr) + float x; int *eptr; +#endif +{ + __int32_t hx, ix; + GET_FLOAT_WORD(hx,x); + ix = 0x7fffffff&hx; + *eptr = 0; + if(!FLT_UWORD_IS_FINITE(ix)||FLT_UWORD_IS_ZERO(ix)) return x; /* 0,inf,nan */ + if (FLT_UWORD_IS_SUBNORMAL(ix)) { /* subnormal */ + x *= two25; + GET_FLOAT_WORD(hx,x); + ix = hx&0x7fffffff; + *eptr = -25; + } + *eptr += (ix>>23)-126; + hx = (hx&0x807fffff)|0x3f000000; + SET_FLOAT_WORD(x,hx); + return x; +} + +#ifdef _DOUBLE_IS_32BITS + +#ifdef __STDC__ + double frexp(double x, int *eptr) +#else + double frexp(x, eptr) + double x; int *eptr; +#endif +{ + return (double) frexpf((float) x, eptr); +} + +#endif /* defined(_DOUBLE_IS_32BITS) */ diff --git a/lib/libm/sf_modf.c b/lib/libm/sf_modf.c new file mode 100644 index 0000000000..4fcae057a5 --- /dev/null +++ b/lib/libm/sf_modf.c @@ -0,0 +1,82 @@ +/* + * This file is part of the Micro Python project, http://micropython.org/ + * + * These math functions are taken from newlib-nano-2, the newlib/libm/common + * directory, available from https://github.com/32bitmicro/newlib-nano-2. + * + * Appropriate copyright headers are reproduced below. + */ + +/* sf_modf.c -- float version of s_modf.c. + * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. + */ + +/* + * ==================================================== + * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. + * + * Developed at SunPro, a Sun Microsystems, Inc. business. + * Permission to use, copy, modify, and distribute this + * software is freely granted, provided that this notice + * is preserved. + * ==================================================== + */ + +#include "fdlibm.h" + +#ifdef __STDC__ +static const float one = 1.0; +#else +static float one = 1.0; +#endif + +#ifdef __STDC__ + float modff(float x, float *iptr) +#else + float modff(x, iptr) + float x,*iptr; +#endif +{ + __int32_t i0,j0; + __uint32_t i; + GET_FLOAT_WORD(i0,x); + j0 = ((i0>>23)&0xff)-0x7f; /* exponent of x */ + if(j0<23) { /* integer part in x */ + if(j0<0) { /* |x|<1 */ + SET_FLOAT_WORD(*iptr,i0&0x80000000); /* *iptr = +-0 */ + return x; + } else { + i = (0x007fffff)>>j0; + if((i0&i)==0) { /* x is integral */ + __uint32_t ix; + *iptr = x; + GET_FLOAT_WORD(ix,x); + SET_FLOAT_WORD(x,ix&0x80000000); /* return +-0 */ + return x; + } else { + SET_FLOAT_WORD(*iptr,i0&(~i)); + return x - *iptr; + } + } + } else { /* no fraction part */ + __uint32_t ix; + *iptr = x*one; + GET_FLOAT_WORD(ix,x); + SET_FLOAT_WORD(x,ix&0x80000000); /* return +-0 */ + return x; + } +} + +#ifdef _DOUBLE_IS_32BITS + +#ifdef __STDC__ + double modf(double x, double *iptr) +#else + double modf(x, iptr) + double x,*iptr; +#endif +{ + return (double) modff((float) x, (float *) iptr); +} + +#endif /* defined(_DOUBLE_IS_32BITS) */ |