69 lines
2.0 KiB
C
69 lines
2.0 KiB
C
// Copyright 2007 Georgia Institute of Technology. All rights reserved.
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// ABSOLUTELY NOT FOR DISTRIBUTION
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/**
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* @file scale.h
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*
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* Configuration for dealing with problem scale.
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*
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* This contains hints as to what sizes the problems might be and what
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* integer types to use; for instance, to use 64-bit integers on 64-bit
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* machines if scale is defined as FL_SCALE_LARGE.
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*
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* FL_SCALE_NORMAL - Problems are as large as conveniently fits into the
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* machine's natural integer sizes. On all major systems in 2007 this
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* is 32 bits.
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*
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* FL_SCALE_LARGE - Support problem sizes as large as the architecture can
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* support. Unless you have at least 2 billion data points, this will
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* probably waste space, reducing cache efficiency.
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*
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* FL_SCALE_TOOLARGE - Support problem sizes that are too large to fit in
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* RAM, i.e. more than 2 billion data points. This means 64-bit everything.
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*/
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#ifndef FL_SCALE_H
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#define FL_SCALE_H
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#include "base/basic_types.h"
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#if !defined(FL_SCALE_NORMAL) && !defined(FL_SCALE_LARGE) && !defined(FL_SCALE_TOOLARGE)
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/** Normal problem scale size - up to 16 gigabytes of data. */
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#define FL_SCALE_NORMAL /* assume normal unless otherwise noted */
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#endif
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#ifdef FL_SCALE_NORMAL
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typedef int index_t_impl; /* normal sized datasets - usually 32-bit */
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#define LI_IMPL ""
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#endif
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#ifdef FL_SCALE_LARGE
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typedef ssize_t index_t_impl; /* as large as can possibly fit on my machine */
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#define LI_IMPL "l"
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#endif
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#ifdef FL_SCALE_TOOLARGE
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typedef int64 index_t_impl; /* too large to fit in RAM? */
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#define LI_IMPL L64
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#endif
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/**
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* Index type used throughout FASTlib for array sizes and vector dimensions.
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*
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* This value will be 32-bit most of the time to save space, but will be
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* defined to 64-bit in cases where you expect to use very large datasets.
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*/
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typedef index_t_impl index_t;
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/**
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* Length modifier for emitting index_t with printf.
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*
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* Example:
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* @code
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* index_t i = 42;
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* printf("%"LI"d\n", i);
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* @endcode
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*/
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#define LI LI_IMPL
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#endif /* FL_SCALE_H */
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