xt_stripe_util.h

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/*
 * Keywords:
 * Maintainer: Jörg Behrens <behrens@dkrz.de>
 *             Moritz Hanke <hanke@dkrz.de>
 *             Thomas Jahns <jahns@dkrz.de>
 * URL: https://dkrz-sw.gitlab-pages.dkrz.de/yaxt/
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are  permitted provided that the following conditions are
 * met:
 *
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
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 * notice, this list of conditions and the following disclaimer in the
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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 */
#ifndef XT_STRIPE_UTIL_H
#define XT_STRIPE_UTIL_H
 
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
 
#include <stdbool.h>
#include <stdlib.h>
 
#include "xt/xt_stripe.h"
 
#include "core/ppm_visibility.h"
#include "xt_arithmetic_util.h"

struct Xt_minmax
{
  Xt_int min, max;
};
 
static inline struct Xt_minmax
xt_stripe2minmax(struct Xt_stripe stripe)
{
  Xt_int min = stripe.start, max = min;
  Xt_int stride = stripe.stride;
  int nstrides = stripe.nstrides;
  Xt_int mask = Xt_isign_mask(stride);
  stride = (Xt_int)((Xt_int)(nstrides - 1) * stride);
  min = (Xt_int)(min + (Xt_int)(mask & stride));
  max = (Xt_int)(max + (Xt_int)((Xt_int)~mask & stride));
  return (struct Xt_minmax){ .min = min, .max = max};
}
 
static inline int
xt_stripes_eq(struct Xt_stripe a, struct Xt_stripe b) {
  return a.stride == b.stride
    && a.start == b.start
    && a.nstrides == b.nstrides;
}
 
static inline int
xt_stripes_overlap(struct Xt_stripe a, struct Xt_stripe b) {
  struct Xt_minmax mma = xt_stripe2minmax(a),
    mmb = xt_stripe2minmax(b);
  return (mma.max >= mmb.min) & (mma.min <= mmb.max);
}

PPM_DSO_INTERNAL size_t
xt_indices_count_stripes(size_t num_indices,
                         const Xt_int indices[num_indices]);

PPM_DSO_INTERNAL size_t
xt_convert_indices_to_stripes_buf(size_t num_indices,
                                  const Xt_int *restrict indices,
                                  size_t num_stripes_alloc,
                                  struct Xt_stripe *stripes);

PPM_DSO_INTERNAL void
xt_convert_indices_to_stripes_keep_buf(const Xt_int *restrict indices,
                                       int num_indices,
                                       struct Xt_stripe **stripes,
                                       int * num_stripes);

PPM_DSO_INTERNAL size_t
xt_stripes_merge_copy(size_t num_stripes,
                      struct Xt_stripe *stripes_dst,
                      const struct Xt_stripe *stripes_src,
                      bool lookback);
 
enum {
  sort_dsc,                     /* sorted descending */
  sort_uns,                     /* unsorted */
  sort_asc,                     /* sorted ascending */
  sort_idt,                     /* all values identical */
  sort_mask = 3,
};
 
#define XT_SORT_FLAGS(ntrans_up, ntrans_dn)                             \
  (unsigned)((!(ntrans_dn) && !(ntrans_up)) ? sort_idt          \
             : ((!(ntrans_dn)) ? sort_asc                           \
                : ((!(ntrans_up)) ? sort_dsc : sort_uns)))
 
struct Xt_stripe_summary {
  long long num_indices;
  unsigned flags;
};
 
PPM_DSO_INTERNAL struct Xt_stripe_summary
xt_summarize_stripes(size_t num_stripes,
                     const struct Xt_stripe stripes[num_stripes]);
 
PPM_DSO_INTERNAL bool
xt_stripes_detect_duplicate(size_t num_stripes,
                            const struct Xt_stripe stripes[num_stripes],
                            struct Xt_minmax index_range);
 
 
#endif
 
/*
 * Local Variables:
 * c-basic-offset: 2
 * coding: utf-8
 * indent-tabs-mode: nil
 * show-trailing-whitespace: t
 * require-trailing-newline: t
 * End:
 */