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f563ebec5b
Estimated hours taken: 0.25 Branches: main Fix a bug that broke the stage 1 build with lcc in grade hlc.gc. runtime/mercury_float.h: Add a missing #include of mercury_std.h, needed for MR_bool.
124 lines
3.5 KiB
C
124 lines
3.5 KiB
C
/*
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** Copyright (C) 1995-1997, 1999-2002 The University of Melbourne.
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** This file may only be copied under the terms of the GNU Library General
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** Public License - see the file COPYING.LIB in the Mercury distribution.
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*/
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/* mercury_float.h - floating point handling */
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#ifndef MERCURY_FLOAT_H
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#define MERCURY_FLOAT_H
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#include "mercury_conf.h" /* for MR_BOXED_FLOAT, MR_CONSERVATIVE_GC */
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#include "mercury_types.h" /* for `MR_Word' */
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#include "mercury_std.h" /* for `MR_bool' */
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#ifdef MR_USE_SINGLE_PREC_FLOAT
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typedef float MR_Float;
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#define MR_FLT_MIN_PRECISION 7
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#define MR_FLT_FMT "%f"
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#else
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typedef double MR_Float;
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#define MR_FLT_MIN_PRECISION 15
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#define MR_FLT_FMT "%lf"
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#endif
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#define MR_FLT_MAX_PRECISION (MR_FLT_MIN_PRECISION + 2)
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#ifdef MR_BOXED_FLOAT
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#define MR_word_to_float(w) (* (MR_Float *) (w))
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#define MR_FLOAT_WORDS ((sizeof(MR_Float) + sizeof(MR_Word) - 1) \
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/ sizeof(MR_Word))
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#ifdef MR_CONSERVATIVE_GC
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#define MR_float_to_word(f) ( \
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MR_hp_alloc_atomic(MR_FLOAT_WORDS), \
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* (MR_Float *) (void *) (MR_hp - MR_FLOAT_WORDS) = (f), \
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/* return */ (MR_Word) (MR_hp - MR_FLOAT_WORDS) \
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)
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#define MR_make_hp_float_aligned() ((void)0)
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#else
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/*
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** We need to ensure that what we allocated on the heap is properly
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** aligned for a floating-point value, by rounding MR_hp up to the
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** nearest float-aligned boundary.
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** XXX This code assumes that sizeof(MR_Float) is a power of two,
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** and not greater than 2 * sizeof(MR_Word).
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*/
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#define MR_make_hp_float_aligned() ( \
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( (MR_Word) MR_hp & (sizeof(MR_Float) - 1) ? \
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MR_hp_alloc_atomic(1) : (void)0 ) \
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)
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#define MR_float_to_word(f) ( \
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MR_make_hp_float_aligned(), \
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MR_hp_alloc_atomic(MR_FLOAT_WORDS), \
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* (MR_Float *) (void *)(MR_hp - MR_FLOAT_WORDS) = (f), \
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/* return */ (MR_Word) (MR_hp - MR_FLOAT_WORDS) \
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)
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#endif
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#ifdef __GNUC__
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#define MR_float_const(f) ({ static const MR_Float d = f; (MR_Word) &d; })
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#else
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#define MR_float_const(f) MR_float_to_word(f) /* inefficient */
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#endif
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#else /* not MR_BOXED_FLOAT */
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/* unboxed float means we can assume sizeof(MR_Float) == sizeof(MR_Word) */
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#define MR_make_hp_float_aligned() ((void)0)
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union MR_Float_Word {
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MR_Float f;
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MR_Word w;
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};
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#define MR_float_const(f) MR_float_to_word(f)
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#ifdef __GNUC__
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/* GNU C allows you to cast to a union type */
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#define MR_float_to_word(f) (__extension__ \
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((union MR_Float_Word)(MR_Float)(f)).w)
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#define MR_word_to_float(w) (__extension__ \
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((union MR_Float_Word)(MR_Word)(w)).f)
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#else /* not __GNUC__ */
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static MR_Word MR_float_to_word(MR_Float f)
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{ union MR_Float_Word tmp; tmp.f = f; return tmp.w; }
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static MR_Float MR_word_to_float(MR_Word w)
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{ union MR_Float_Word tmp; tmp.w = w; return tmp.f; }
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#endif /* not __GNUC__ */
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#endif /* not MR_BOXED_FLOAT */
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/*
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** The size of the buffer to pass to MR_sprintf_float.
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**
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** Longest possible string for %#.*g format is `-n.nnnnnnE-mmmm', which
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** has size PRECISION + MAX_EXPONENT_DIGITS + 5 (for the `-', `.', `E',
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** '-', and '\\0'). PRECISION is at most 20, and MAX_EXPONENT_DIGITS is
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** at most 5, so we need at most 30 chars. 80 is way more than enough.
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*/
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#define MR_SPRINTF_FLOAT_BUF_SIZE 80
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#define MR_float_to_string(Float, String) \
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do { \
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char buf[MR_SPRINTF_FLOAT_BUF_SIZE]; \
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MR_sprintf_float(buf, Float); \
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MR_make_aligned_string_copy(Str, buf); \
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} while (0)
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void MR_sprintf_float(char *buf, MR_Float f);
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MR_Integer MR_hash_float(MR_Float);
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MR_bool MR_is_nan(MR_Float);
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MR_bool MR_is_inf(MR_Float);
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#endif /* not MERCURY_FLOAT_H */
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