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minloc2_8_s4.c revision 1.1.1.3.2.1 
      1 /* Implementation of the MINLOC intrinsic
      2    Copyright (C) 2017-2022 Free Software Foundation, Inc.
      3    Contributed by Thomas Koenig
      4 
      5 This file is part of the GNU Fortran runtime library (libgfortran).
      6 
      7 Libgfortran is free software; you can redistribute it and/or
      8 modify it under the terms of the GNU General Public
      9 License as published by the Free Software Foundation; either
     10 version 3 of the License, or (at your option) any later version.
     11 
     12 Libgfortran is distributed in the hope that it will be useful,
     13 but WITHOUT ANY WARRANTY; without even the implied warranty of
     14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     15 GNU General Public License for more details.
     16 
     17 Under Section 7 of GPL version 3, you are granted additional
     18 permissions described in the GCC Runtime Library Exception, version
     19 3.1, as published by the Free Software Foundation.
     20 
     21 You should have received a copy of the GNU General Public License and
     22 a copy of the GCC Runtime Library Exception along with this program;
     23 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
     24 <http://www.gnu.org/licenses/>.  */
     25 
     26 #include "libgfortran.h"
     27 #include <stdlib.h>
     28 #include <string.h>
     29 #include <assert.h>
     30 
     31 #if defined (HAVE_GFC_UINTEGER_4) && defined (HAVE_GFC_INTEGER_8)
     32 
     33 static inline int
     34 compare_fcn (const GFC_UINTEGER_4 *a, const GFC_UINTEGER_4 *b, gfc_charlen_type n)
     35 {
     36   if (sizeof (GFC_UINTEGER_4) == 1)
     37     return memcmp (a, b, n);
     38   else
     39     return memcmp_char4 (a, b, n);
     40 }
     41 
     42 extern GFC_INTEGER_8 minloc2_8_s4 (gfc_array_s4 * const restrict, GFC_LOGICAL_4 back,
     43        gfc_charlen_type);
     44 export_proto(minloc2_8_s4);
     45 
     46 GFC_INTEGER_8
     47 minloc2_8_s4 (gfc_array_s4 * const restrict array, GFC_LOGICAL_4 back,
     48 				gfc_charlen_type len)
     49 {
     50   index_type ret;
     51   index_type sstride;
     52   index_type extent;
     53   const GFC_UINTEGER_4 *src;
     54   const GFC_UINTEGER_4 *minval;
     55   index_type i;
     56 
     57   extent = GFC_DESCRIPTOR_EXTENT(array,0);
     58   if (extent <= 0)
     59     return 0;
     60 
     61   sstride = GFC_DESCRIPTOR_STRIDE(array,0) * len;
     62 
     63   ret = 1;
     64   src = array->base_addr;
     65   minval = NULL;
     66   for (i=1; i<=extent; i++)
     67     {
     68       if (minval == NULL || (back ? compare_fcn (src, minval, len) <= 0 :
     69       	 	    	    	    compare_fcn (src, minval, len) < 0))
     70       {
     71 	 ret = i;
     72 	 minval = src;
     73       }
     74       src += sstride;
     75     }
     76   return ret;
     77 }
     78 
     79 extern GFC_INTEGER_8 mminloc2_8_s4 (gfc_array_s4 * const restrict,
     80                     gfc_array_l1 *const restrict mask, GFC_LOGICAL_4 back,
     81 		    gfc_charlen_type);
     82 export_proto(mminloc2_8_s4);
     83 
     84 GFC_INTEGER_8
     85 mminloc2_8_s4 (gfc_array_s4 * const restrict array,
     86 				 gfc_array_l1 * const restrict mask, GFC_LOGICAL_4 back,
     87 				 gfc_charlen_type len)
     88 {
     89   index_type ret;
     90   index_type sstride;
     91   index_type extent;
     92   const GFC_UINTEGER_4 *src;
     93   const GFC_UINTEGER_4 *maxval;
     94   index_type i, j;
     95   GFC_LOGICAL_1 *mbase;
     96   int mask_kind;
     97   index_type mstride;
     98 
     99   extent = GFC_DESCRIPTOR_EXTENT(array,0);
    100   if (extent <= 0)
    101     return 0;
    102 
    103   sstride = GFC_DESCRIPTOR_STRIDE(array,0) * len;
    104 
    105   mask_kind = GFC_DESCRIPTOR_SIZE (mask);
    106   mbase = mask->base_addr;
    107 
    108   if (mask_kind == 1 || mask_kind == 2 || mask_kind == 4 || mask_kind == 8
    109 #ifdef HAVE_GFC_LOGICAL_16
    110       || mask_kind == 16
    111 #endif
    112       )
    113     mbase = GFOR_POINTER_TO_L1 (mbase, mask_kind);
    114   else
    115     internal_error (NULL, "Funny sized logical array");
    116 
    117   mstride = GFC_DESCRIPTOR_STRIDE_BYTES(mask,0);
    118 
    119   /* Search for the first occurrence of a true element in mask. */
    120   for (j=0; j<extent; j++)
    121     {
    122       if (*mbase)
    123         break;
    124       mbase += mstride;
    125     }
    126 
    127   if (j == extent)
    128     return 0;
    129 
    130   ret = j + 1;
    131   src = array->base_addr + j * sstride;
    132   maxval = src;
    133 
    134   for (i=j+1; i<=extent; i++)
    135     {
    136 
    137       if (*mbase && (back ? compare_fcn (src, maxval, len) <= 0 :
    138       	 	    	    compare_fcn (src, maxval, len) < 0))
    139       {
    140 	 ret = i;
    141 	 maxval = src;
    142       }
    143       src += sstride;
    144       mbase += mstride;
    145     }
    146   return ret;
    147 }
    148 
    149 extern GFC_INTEGER_8 sminloc2_8_s4 (gfc_array_s4 * const restrict,
    150        		    	GFC_LOGICAL_4 *mask, GFC_LOGICAL_4 back, gfc_charlen_type);
    151 export_proto(sminloc2_8_s4);
    152 
    153 GFC_INTEGER_8
    154 sminloc2_8_s4 (gfc_array_s4 * const restrict array,
    155 				 GFC_LOGICAL_4 *mask, GFC_LOGICAL_4 back, gfc_charlen_type len)
    156 {
    157   if (mask == NULL || *mask)
    158     return minloc2_8_s4 (array, back, len);
    159   else
    160     return 0;
    161 }
    162 
    163 #endif
    164