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351 lines
8.6 KiB
C
351 lines
8.6 KiB
C
/* Implementation of the MINLOC intrinsic
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Copyright (C) 2017-2024 Free Software Foundation, Inc.
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Contributed by Thomas Koenig
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This file is part of the GNU Fortran runtime library (libgfortran).
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Libgfortran is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public
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License as published by the Free Software Foundation; either
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version 3 of the License, or (at your option) any later version.
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Libgfortran is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "libgfortran.h"
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <limits.h>
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#if defined (HAVE_GFC_UINTEGER_4) && defined (HAVE_GFC_INTEGER_4)
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#define HAVE_BACK_ARG 1
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static inline int
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compare_fcn (const GFC_UINTEGER_4 *a, const GFC_UINTEGER_4 *b, gfc_charlen_type n)
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{
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if (sizeof (GFC_UINTEGER_4) == 1)
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return memcmp (a, b, n);
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else
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return memcmp_char4 (a, b, n);
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}
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extern void minloc0_4_s4 (gfc_array_i4 * const restrict retarray,
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gfc_array_s4 * const restrict array, GFC_LOGICAL_4 back, gfc_charlen_type len);
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export_proto(minloc0_4_s4);
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void
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minloc0_4_s4 (gfc_array_i4 * const restrict retarray,
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gfc_array_s4 * const restrict array, GFC_LOGICAL_4 back, gfc_charlen_type len)
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{
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index_type count[GFC_MAX_DIMENSIONS];
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index_type extent[GFC_MAX_DIMENSIONS];
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index_type sstride[GFC_MAX_DIMENSIONS];
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index_type dstride;
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const GFC_UINTEGER_4 *base;
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GFC_INTEGER_4 * restrict dest;
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index_type rank;
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index_type n;
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rank = GFC_DESCRIPTOR_RANK (array);
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if (rank <= 0)
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runtime_error ("Rank of array needs to be > 0");
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if (retarray->base_addr == NULL)
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{
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GFC_DIMENSION_SET(retarray->dim[0], 0, rank-1, 1);
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retarray->dtype.rank = 1;
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retarray->offset = 0;
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retarray->base_addr = xmallocarray (rank, sizeof (GFC_INTEGER_4));
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}
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else
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{
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if (unlikely (compile_options.bounds_check))
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bounds_iforeach_return ((array_t *) retarray, (array_t *) array,
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"MINLOC");
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}
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dstride = GFC_DESCRIPTOR_STRIDE(retarray,0);
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dest = retarray->base_addr;
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for (n = 0; n < rank; n++)
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{
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sstride[n] = GFC_DESCRIPTOR_STRIDE(array,n) * len;
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extent[n] = GFC_DESCRIPTOR_EXTENT(array,n);
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count[n] = 0;
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if (extent[n] <= 0)
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{
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/* Set the return value. */
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for (n = 0; n < rank; n++)
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dest[n * dstride] = 0;
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return;
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}
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}
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base = array->base_addr;
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/* Initialize the return value. */
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for (n = 0; n < rank; n++)
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dest[n * dstride] = 1;
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{
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const GFC_UINTEGER_4 *minval;
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minval = NULL;
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while (base)
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{
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do
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{
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/* Implementation start. */
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if (minval == NULL || (back ? compare_fcn (base, minval, len) <= 0 :
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compare_fcn (base, minval, len) < 0))
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{
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minval = base;
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for (n = 0; n < rank; n++)
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dest[n * dstride] = count[n] + 1;
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}
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/* Implementation end. */
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/* Advance to the next element. */
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base += sstride[0];
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}
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while (++count[0] != extent[0]);
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n = 0;
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do
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{
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/* When we get to the end of a dimension, reset it and increment
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the next dimension. */
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count[n] = 0;
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/* We could precalculate these products, but this is a less
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frequently used path so probably not worth it. */
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base -= sstride[n] * extent[n];
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n++;
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if (n >= rank)
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{
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/* Break out of the loop. */
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base = NULL;
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break;
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}
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else
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{
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count[n]++;
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base += sstride[n];
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}
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}
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while (count[n] == extent[n]);
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}
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}
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}
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extern void mminloc0_4_s4 (gfc_array_i4 * const restrict,
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gfc_array_s4 * const restrict, gfc_array_l1 * const restrict , GFC_LOGICAL_4 back,
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gfc_charlen_type len);
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export_proto(mminloc0_4_s4);
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void
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mminloc0_4_s4 (gfc_array_i4 * const restrict retarray,
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gfc_array_s4 * const restrict array,
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gfc_array_l1 * const restrict mask, GFC_LOGICAL_4 back,
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gfc_charlen_type len)
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{
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index_type count[GFC_MAX_DIMENSIONS];
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index_type extent[GFC_MAX_DIMENSIONS];
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index_type sstride[GFC_MAX_DIMENSIONS];
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index_type mstride[GFC_MAX_DIMENSIONS];
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index_type dstride;
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GFC_INTEGER_4 *dest;
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const GFC_UINTEGER_4 *base;
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GFC_LOGICAL_1 *mbase;
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int rank;
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index_type n;
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int mask_kind;
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if (mask == NULL)
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{
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#ifdef HAVE_BACK_ARG
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minloc0_4_s4 (retarray, array, back, len);
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#else
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minloc0_4_s4 (retarray, array, len);
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#endif
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return;
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}
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rank = GFC_DESCRIPTOR_RANK (array);
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if (rank <= 0)
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runtime_error ("Rank of array needs to be > 0");
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if (retarray->base_addr == NULL)
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{
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GFC_DIMENSION_SET(retarray->dim[0], 0, rank - 1, 1);
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retarray->dtype.rank = 1;
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retarray->offset = 0;
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retarray->base_addr = xmallocarray (rank, sizeof (GFC_INTEGER_4));
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}
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else
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{
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if (unlikely (compile_options.bounds_check))
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{
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bounds_iforeach_return ((array_t *) retarray, (array_t *) array,
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"MINLOC");
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bounds_equal_extents ((array_t *) mask, (array_t *) array,
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"MASK argument", "MINLOC");
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}
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}
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mask_kind = GFC_DESCRIPTOR_SIZE (mask);
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mbase = mask->base_addr;
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if (mask_kind == 1 || mask_kind == 2 || mask_kind == 4 || mask_kind == 8
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#ifdef HAVE_GFC_LOGICAL_16
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|| mask_kind == 16
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#endif
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)
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mbase = GFOR_POINTER_TO_L1 (mbase, mask_kind);
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else
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runtime_error ("Funny sized logical array");
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dstride = GFC_DESCRIPTOR_STRIDE(retarray,0);
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dest = retarray->base_addr;
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for (n = 0; n < rank; n++)
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{
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sstride[n] = GFC_DESCRIPTOR_STRIDE(array,n) * len;
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mstride[n] = GFC_DESCRIPTOR_STRIDE_BYTES(mask,n);
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extent[n] = GFC_DESCRIPTOR_EXTENT(array,n);
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count[n] = 0;
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if (extent[n] <= 0)
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{
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/* Set the return value. */
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for (n = 0; n < rank; n++)
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dest[n * dstride] = 0;
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return;
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}
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}
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base = array->base_addr;
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/* Initialize the return value. */
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for (n = 0; n < rank; n++)
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dest[n * dstride] = 0;
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{
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const GFC_UINTEGER_4 *minval;
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minval = NULL;
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while (base)
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{
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do
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{
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/* Implementation start. */
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if (*mbase &&
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(minval == NULL || (back ? compare_fcn (base, minval, len) <= 0 :
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compare_fcn (base, minval, len) < 0)))
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{
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minval = base;
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for (n = 0; n < rank; n++)
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dest[n * dstride] = count[n] + 1;
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}
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/* Implementation end. */
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/* Advance to the next element. */
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base += sstride[0];
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mbase += mstride[0];
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}
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while (++count[0] != extent[0]);
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n = 0;
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do
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{
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/* When we get to the end of a dimension, reset it and increment
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the next dimension. */
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count[n] = 0;
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/* We could precalculate these products, but this is a less
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frequently used path so probably not worth it. */
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base -= sstride[n] * extent[n];
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mbase -= mstride[n] * extent[n];
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n++;
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if (n >= rank)
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{
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/* Break out of the loop. */
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base = NULL;
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break;
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}
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else
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{
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count[n]++;
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base += sstride[n];
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mbase += mstride[n];
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}
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}
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while (count[n] == extent[n]);
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}
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}
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}
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extern void sminloc0_4_s4 (gfc_array_i4 * const restrict,
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gfc_array_s4 * const restrict, GFC_LOGICAL_4 *, GFC_LOGICAL_4 back,
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gfc_charlen_type len);
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export_proto(sminloc0_4_s4);
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void
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sminloc0_4_s4 (gfc_array_i4 * const restrict retarray,
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gfc_array_s4 * const restrict array,
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GFC_LOGICAL_4 * mask, GFC_LOGICAL_4 back,
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gfc_charlen_type len)
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{
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index_type rank;
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index_type dstride;
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index_type n;
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GFC_INTEGER_4 *dest;
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if (mask == NULL || *mask)
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{
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#ifdef HAVE_BACK_ARG
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minloc0_4_s4 (retarray, array, back, len);
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#else
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minloc0_4_s4 (retarray, array, len);
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#endif
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return;
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}
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rank = GFC_DESCRIPTOR_RANK (array);
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if (rank <= 0)
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runtime_error ("Rank of array needs to be > 0");
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if (retarray->base_addr == NULL)
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{
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GFC_DIMENSION_SET(retarray->dim[0], 0, rank-1, 1);
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retarray->dtype.rank = 1;
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retarray->offset = 0;
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retarray->base_addr = xmallocarray (rank, sizeof (GFC_INTEGER_4));
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}
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else if (unlikely (compile_options.bounds_check))
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{
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bounds_iforeach_return ((array_t *) retarray, (array_t *) array,
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"MINLOC");
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}
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dstride = GFC_DESCRIPTOR_STRIDE(retarray,0);
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dest = retarray->base_addr;
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for (n = 0; n<rank; n++)
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dest[n * dstride] = 0 ;
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}
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#endif
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