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| -rw-r--r-- | include/math-emu/soft-fp.h | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/include/math-emu/soft-fp.h b/include/math-emu/soft-fp.h new file mode 100644 index 000000000..5650c1628 --- /dev/null +++ b/include/math-emu/soft-fp.h @@ -0,0 +1,207 @@ +/* Software floating-point emulation. + Copyright (C) 1997,1998,1999 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Richard Henderson (rth@cygnus.com), + Jakub Jelinek (jj@ultra.linux.cz), + David S. Miller (davem@redhat.com) and + Peter Maydell (pmaydell@chiark.greenend.org.uk). + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If + not, write to the Free Software Foundation, Inc., + 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +#ifndef __MATH_EMU_SOFT_FP_H__ +#define __MATH_EMU_SOFT_FP_H__ + +#include <asm/sfp-machine.h> + +/* Allow sfp-machine to have its own byte order definitions. */ +#ifndef __BYTE_ORDER +#include <endian.h> +#endif + +#define _FP_WORKBITS 3 +#define _FP_WORK_LSB ((_FP_W_TYPE)1 << 3) +#define _FP_WORK_ROUND ((_FP_W_TYPE)1 << 2) +#define _FP_WORK_GUARD ((_FP_W_TYPE)1 << 1) +#define _FP_WORK_STICKY ((_FP_W_TYPE)1 << 0) + +#ifndef FP_RND_NEAREST +# define FP_RND_NEAREST 0 +# define FP_RND_ZERO 1 +# define FP_RND_PINF 2 +# define FP_RND_MINF 3 +#ifndef FP_ROUNDMODE +# define FP_ROUNDMODE FP_RND_NEAREST +#endif +#endif + +/* By default don't care about exceptions. */ +#ifndef FP_EX_INVALID +#define FP_EX_INVALID 0 +#endif +#ifndef FP_EX_INVALID_SNAN +#define FP_EX_INVALID_SNAN 0 +#endif +/* inf - inf */ +#ifndef FP_EX_INVALID_ISI +#define FP_EX_INVALID_ISI 0 +#endif +/* inf / inf */ +#ifndef FP_EX_INVALID_IDI +#define FP_EX_INVALID_IDI 0 +#endif +/* 0 / 0 */ +#ifndef FP_EX_INVALID_ZDZ +#define FP_EX_INVALID_ZDZ 0 +#endif +/* inf * 0 */ +#ifndef FP_EX_INVALID_IMZ +#define FP_EX_INVALID_IMZ 0 +#endif +#ifndef FP_EX_OVERFLOW +#define FP_EX_OVERFLOW 0 +#endif +#ifndef FP_EX_UNDERFLOW +#define FP_EX_UNDERFLOW +#endif +#ifndef FP_EX_DIVZERO +#define FP_EX_DIVZERO 0 +#endif +#ifndef FP_EX_INEXACT +#define FP_EX_INEXACT 0 +#endif +#ifndef FP_EX_DENORM +#define FP_EX_DENORM 0 +#endif + +#ifdef _FP_DECL_EX +#define FP_DECL_EX \ + int _fex = 0; \ + _FP_DECL_EX +#else +#define FP_DECL_EX int _fex = 0 +#endif + +#ifndef FP_INIT_ROUNDMODE +#define FP_INIT_ROUNDMODE do {} while (0) +#endif + +#ifndef FP_HANDLE_EXCEPTIONS +#define FP_HANDLE_EXCEPTIONS do {} while (0) +#endif + +/* By default we never flush denormal input operands to signed zero. */ +#ifndef FP_DENORM_ZERO +#define FP_DENORM_ZERO 0 +#endif + +#ifndef FP_INHIBIT_RESULTS +/* By default we write the results always. + * sfp-machine may override this and e.g. + * check if some exceptions are unmasked + * and inhibit it in such a case. + */ +#define FP_INHIBIT_RESULTS 0 +#endif + +#ifndef FP_TRAPPING_EXCEPTIONS +#define FP_TRAPPING_EXCEPTIONS 0 +#endif + +#define FP_SET_EXCEPTION(ex) \ + _fex |= (ex) + +#define FP_UNSET_EXCEPTION(ex) \ + _fex &= ~(ex) + +#define FP_CUR_EXCEPTIONS \ + (_fex) + +#define FP_CLEAR_EXCEPTIONS \ + _fex = 0 + +#define _FP_ROUND_NEAREST(wc, X) \ +do { \ + if ((_FP_FRAC_LOW_##wc(X) & 15) != _FP_WORK_ROUND) \ + _FP_FRAC_ADDI_##wc(X, _FP_WORK_ROUND); \ +} while (0) + +#define _FP_ROUND_ZERO(wc, X) (void)0 + +#define _FP_ROUND_PINF(wc, X) \ +do { \ + if (!X##_s && (_FP_FRAC_LOW_##wc(X) & 7)) \ + _FP_FRAC_ADDI_##wc(X, _FP_WORK_LSB); \ +} while (0) + +#define _FP_ROUND_MINF(wc, X) \ +do { \ + if (X##_s && (_FP_FRAC_LOW_##wc(X) & 7)) \ + _FP_FRAC_ADDI_##wc(X, _FP_WORK_LSB); \ +} while (0) + +#define _FP_ROUND(wc, X) \ +do { \ + if (_FP_FRAC_LOW_##wc(X) & 7) \ + FP_SET_EXCEPTION(FP_EX_INEXACT); \ + switch (FP_ROUNDMODE) \ + { \ + case FP_RND_NEAREST: \ + _FP_ROUND_NEAREST(wc,X); \ + break; \ + case FP_RND_ZERO: \ + _FP_ROUND_ZERO(wc,X); \ + break; \ + case FP_RND_PINF: \ + _FP_ROUND_PINF(wc,X); \ + break; \ + case FP_RND_MINF: \ + _FP_ROUND_MINF(wc,X); \ + break; \ + } \ +} while (0) + +#define FP_CLS_NORMAL 0 +#define FP_CLS_ZERO 1 +#define FP_CLS_INF 2 +#define FP_CLS_NAN 3 + +#define _FP_CLS_COMBINE(x,y) (((x) << 2) | (y)) + +#include <math-emu/op-1.h> +#include <math-emu/op-2.h> +#include <math-emu/op-4.h> +#include <math-emu/op-8.h> +#include <math-emu/op-common.h> + +/* Sigh. Silly things longlong.h needs. */ +#define UWtype _FP_W_TYPE +#define W_TYPE_SIZE _FP_W_TYPE_SIZE + +typedef int SItype __attribute__((mode(SI))); +typedef int DItype __attribute__((mode(DI))); +typedef unsigned int USItype __attribute__((mode(SI))); +typedef unsigned int UDItype __attribute__((mode(DI))); +#if _FP_W_TYPE_SIZE == 32 +typedef unsigned int UHWtype __attribute__((mode(HI))); +#elif _FP_W_TYPE_SIZE == 64 +typedef USItype UHWtype; +#endif + +#ifndef umul_ppmm +#include <stdlib/longlong.h> +#endif + +#endif /* __MATH_EMU_SOFT_FP_H__ */ |