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[/] [openrisc/] [trunk/] [bootloaders/] [orpmon/] [coremark/] [fmod.c] - Rev 706
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typedef unsigned int u_int32_t; typedef signed int int32_t; // Big endian struct... typedef union { double value; struct { u_int32_t msw; u_int32_t lsw; } parts; } ieee_double_shape_type; /* typedef union { double value; struct { u_int32_t lsw; u_int32_t msw; } parts; } ieee_double_shape_type; */ /* Get two 32 bit ints from a double. */ #define EXTRACT_WORDS(ix0,ix1,d) \ do { \ ieee_double_shape_type ew_u; \ ew_u.value = (d); \ (ix0) = ew_u.parts.msw; \ (ix1) = ew_u.parts.lsw; \ } while (0) /* Get the more significant 32 bit int from a double. */ #define GET_HIGH_WORD(i,d) \ do { \ ieee_double_shape_type gh_u; \ gh_u.value = (d); \ (i) = gh_u.parts.msw; \ } while (0) /* Get the less significant 32 bit int from a double. */ #define GET_LOW_WORD(i,d) \ do { \ ieee_double_shape_type gl_u; \ gl_u.value = (d); \ (i) = gl_u.parts.lsw; \ } while (0) /* Set a double from two 32 bit ints. */ #define INSERT_WORDS(d,ix0,ix1) \ do { \ ieee_double_shape_type iw_u; \ iw_u.parts.msw = (ix0); \ iw_u.parts.lsw = (ix1); \ (d) = iw_u.value; \ } while (0) /* Set the more significant 32 bits of a double from an int. */ #define SET_HIGH_WORD(d,v) \ do { \ ieee_double_shape_type sh_u; \ sh_u.value = (d); \ sh_u.parts.msw = (v); \ (d) = sh_u.value; \ } while (0) /* Set the less significant 32 bits of a double from an int. */ #define SET_LOW_WORD(d,v) \ do { \ ieee_double_shape_type sl_u; \ sl_u.value = (d); \ sl_u.parts.lsw = (v); \ (d) = sl_u.value; \ } while (0) /* A union which permits us to convert between a float and a 32 bit int. */ typedef union { float value; u_int32_t word; } ieee_float_shape_type; /* Get a 32 bit int from a float. */ #define GET_FLOAT_WORD(i,d) \ do { \ ieee_float_shape_type gf_u; \ gf_u.value = (d); \ (i) = gf_u.word; \ } while (0) /* Set a float from a 32 bit int. */ #define SET_FLOAT_WORD(d,i) \ do { \ ieee_float_shape_type sf_u; \ sf_u.word = (i); \ (d) = sf_u.value; \ } while (0) static const double one = 1.0; double modf(double x, double *iptr) { int32_t i0, i1, j0; u_int32_t i; EXTRACT_WORDS(i0, i1, x); j0 = ((i0 >> 20) & 0x7ff) - 0x3ff; /* exponent of x */ if (j0 < 20) { /* integer part in high x */ if (j0 < 0) { /* |x|<1 */ INSERT_WORDS(*iptr, i0 & 0x80000000, 0); /* *iptr = +-0 */ return x; } else { i = (0x000fffff) >> j0; if (((i0 & i) | i1) == 0) { /* x is integral */ u_int32_t high; *iptr = x; GET_HIGH_WORD(high, x); INSERT_WORDS(x, high & 0x80000000, 0); /* return +-0 */ return x; } else { INSERT_WORDS(*iptr, i0 & (~i), 0); return x - *iptr; } } } else if (j0 > 51) { /* no fraction part */ u_int32_t high; *iptr = x * one; GET_HIGH_WORD(high, x); INSERT_WORDS(x, high & 0x80000000, 0); /* return +-0 */ return x; } else { /* fraction part in low x */ i = ((u_int32_t) (0xffffffff)) >> (j0 - 20); if ((i1 & i) == 0) { /* x is integral */ u_int32_t high; *iptr = x; GET_HIGH_WORD(high, x); INSERT_WORDS(x, high & 0x80000000, 0); /* return +-0 */ return x; } else { INSERT_WORDS(*iptr, i0, i1 & (~i)); return x - *iptr; } } }
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