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Diffstat (limited to 'newlib/libc/stdio/vfieeefp.h')
| -rw-r--r-- | newlib/libc/stdio/vfieeefp.h | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/newlib/libc/stdio/vfieeefp.h b/newlib/libc/stdio/vfieeefp.h new file mode 100644 index 00000000000..6843d5f47b0 --- /dev/null +++ b/newlib/libc/stdio/vfieeefp.h @@ -0,0 +1,205 @@ +/**************************************************************** + * + * The author of this software is David M. Gay. + * + * Copyright (c) 1991 by AT&T. + * + * Permission to use, copy, modify, and distribute this software for any + * purpose without fee is hereby granted, provided that this entire notice + * is included in all copies of any software which is or includes a copy + * or modification of this software and in all copies of the supporting + * documentation for such software. + * + * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED + * WARRANTY. IN PARTICULAR, NEITHER THE AUTHOR NOR AT&T MAKES ANY + * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY + * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE. + * + ***************************************************************/ + +/* Please send bug reports to + David M. Gay + AT&T Bell Laboratories, Room 2C-463 + 600 Mountain Avenue + Murray Hill, NJ 07974-2070 + U.S.A. + dmg@research.att.com or research!dmg + */ + +/* This header file is a modification of mprec.h that only contains floating + point union code. */ + +#include <ieeefp.h> +#include <math.h> +#include <float.h> +#include <errno.h> +#include <sys/config.h> + +#ifdef __IEEE_LITTLE_ENDIAN +#define IEEE_8087 +#endif + +#ifdef __IEEE_BIG_ENDIAN +#define IEEE_MC68k +#endif + +#ifdef __Z8000__ +#define Just_16 +#endif + +#ifdef Unsigned_Shifts +#define Sign_Extend(a,b) if (b < 0) a |= (__uint32_t)0xffff0000; +#else +#define Sign_Extend(a,b) /*no-op*/ +#endif + +#if defined(IEEE_8087) + defined(IEEE_MC68k) + defined(VAX) + defined(IBM) != 1 +Exactly one of IEEE_8087, IEEE_MC68k, VAX, or IBM should be defined. +#endif + +/* If we are going to examine or modify specific bits in a double using + the word0 and/or word1 macros, then we must wrap the double inside + a union. This is necessary to avoid undefined behavior according to + the ANSI C spec. */ +union double_union +{ + double d; + __uint32_t i[2]; +}; + +#ifdef IEEE_8087 +#define word0(x) (x.i[1]) +#define word1(x) (x.i[0]) +#else +#define word0(x) (x.i[0]) +#define word1(x) (x.i[1]) +#endif + +/* #define P DBL_MANT_DIG */ +/* Ten_pmax = floor(P*log(2)/log(5)) */ +/* Bletch = (highest power of 2 < DBL_MAX_10_EXP) / 16 */ +/* Quick_max = floor((P-1)*log(FLT_RADIX)/log(10) - 1) */ +/* Int_max = floor(P*log(FLT_RADIX)/log(10) - 1) */ + +#if defined(IEEE_8087) + defined(IEEE_MC68k) +#if defined (_DOUBLE_IS_32BITS) +#define Exp_shift 23 +#define Exp_shift1 23 +#define Exp_msk1 ((__uint32_t)0x00800000L) +#define Exp_msk11 ((__uint32_t)0x00800000L) +#define Exp_mask ((__uint32_t)0x7f800000L) +#define P 24 +#define Bias 127 +#if 0 +#define IEEE_Arith /* it is, but the code doesn't handle IEEE singles yet */ +#endif +#define Emin (-126) +#define Exp_1 ((__uint32_t)0x3f800000L) +#define Exp_11 ((__uint32_t)0x3f800000L) +#define Ebits 8 +#define Frac_mask ((__uint32_t)0x007fffffL) +#define Frac_mask1 ((__uint32_t)0x007fffffL) +#define Ten_pmax 10 +#define Sign_bit ((__uint32_t)0x80000000L) +#define Ten_pmax 10 +#define Bletch 2 +#define Bndry_mask ((__uint32_t)0x007fffffL) +#define Bndry_mask1 ((__uint32_t)0x007fffffL) +#define LSB 1 +#define Sign_bit ((__uint32_t)0x80000000L) +#define Log2P 1 +#define Tiny0 0 +#define Tiny1 1 +#define Quick_max 5 +#define Int_max 6 +#define Infinite(x) (word0(x) == ((__uint32_t)0x7f800000L)) +#undef word0 +#undef word1 + +#define word0(x) (x.i[0]) +#define word1(x) 0 +#else + +#define Exp_shift 20 +#define Exp_shift1 20 +#define Exp_msk1 ((__uint32_t)0x100000L) +#define Exp_msk11 ((__uint32_t)0x100000L) +#define Exp_mask ((__uint32_t)0x7ff00000L) +#define P 53 +#define Bias 1023 +#define IEEE_Arith +#define Emin (-1022) +#define Exp_1 ((__uint32_t)0x3ff00000L) +#define Exp_11 ((__uint32_t)0x3ff00000L) +#define Ebits 11 +#define Frac_mask ((__uint32_t)0xfffffL) +#define Frac_mask1 ((__uint32_t)0xfffffL) +#define Ten_pmax 22 +#define Bletch 0x10 +#define Bndry_mask ((__uint32_t)0xfffffL) +#define Bndry_mask1 ((__uint32_t)0xfffffL) +#define LSB 1 +#define Sign_bit ((__uint32_t)0x80000000L) +#define Log2P 1 +#define Tiny0 0 +#define Tiny1 1 +#define Quick_max 14 +#define Int_max 14 +#define Infinite(x) (word0(x) == ((__uint32_t)0x7ff00000L)) /* sufficient test for here */ +#endif + +#else +#undef Sudden_Underflow +#define Sudden_Underflow +#ifdef IBM +#define Exp_shift 24 +#define Exp_shift1 24 +#define Exp_msk1 ((__uint32_t)0x1000000L) +#define Exp_msk11 ((__uint32_t)0x1000000L) +#define Exp_mask ((__uint32_t)0x7f000000L) +#define P 14 +#define Bias 65 +#define Exp_1 ((__uint32_t)0x41000000L) +#define Exp_11 ((__uint32_t)0x41000000L) +#define Ebits 8 /* exponent has 7 bits, but 8 is the right value in b2d */ +#define Frac_mask ((__uint32_t)0xffffffL) +#define Frac_mask1 ((__uint32_t)0xffffffL) +#define Bletch 4 +#define Ten_pmax 22 +#define Bndry_mask ((__uint32_t)0xefffffL) +#define Bndry_mask1 ((__uint32_t)0xffffffL) +#define LSB 1 +#define Sign_bit ((__uint32_t)0x80000000L) +#define Log2P 4 +#define Tiny0 ((__uint32_t)0x100000L) +#define Tiny1 0 +#define Quick_max 14 +#define Int_max 15 +#else /* VAX */ +#define Exp_shift 23 +#define Exp_shift1 7 +#define Exp_msk1 0x80 +#define Exp_msk11 ((__uint32_t)0x800000L) +#define Exp_mask ((__uint32_t)0x7f80L) +#define P 56 +#define Bias 129 +#define Exp_1 ((__uint32_t)0x40800000L) +#define Exp_11 ((__uint32_t)0x4080L) +#define Ebits 8 +#define Frac_mask ((__uint32_t)0x7fffffL) +#define Frac_mask1 ((__uint32_t)0xffff007fL) +#define Ten_pmax 24 +#define Bletch 2 +#define Bndry_mask ((__uint32_t)0xffff007fL) +#define Bndry_mask1 ((__uint32_t)0xffff007fL) +#define LSB ((__uint32_t)0x10000L) +#define Sign_bit ((__uint32_t)0x8000L) +#define Log2P 1 +#define Tiny0 0x80 +#define Tiny1 0 +#define Quick_max 15 +#define Int_max 15 +#endif +#endif + + |