/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney                              │
│                                                                              │
│ This program is free software; you can redistribute it and/or modify         │
│ it under the terms of the GNU General Public License as published by         │
│ the Free Software Foundation; version 2 of the License.                      │
│                                                                              │
│ This program 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             │
│ General Public License for more details.                                     │
│                                                                              │
│ You should have received a copy of the GNU General Public License            │
│ along with this program; if not, write to the Free Software                  │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA                │
│ 02110-1301 USA                                                               │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/runtime/mappings.h"

size_t findmapping_(int32_t k, const struct MemoryCoord *coords, size_t count) {
  size_t l, r, m;
  l = 0;
  r = count;
  while (l < r) {
    m = (l + r) >> 1;
    if (coords[m].x > k) {
      r = m;
    } else {
      l = m + 1;
    }
  }
  return l;
}

/**
 * Returns appropriate rightmost index.
 */
size_t findmapping(int32_t k) {
  return findmapping_(k, _mm.p, _mm.i);
}

/**
 * Returns appropriate rightmost index.
 */
size_t pickmapping(int32_t k) {
  return findmapping_(k, _mm.p, _mm.i);
}