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      1 `/* Implementation of the MINLOC intrinsic
      2    Copyright (C) 2017-2024 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 include(iparm.m4)dnl
     31 
     32 `#if defined (HAVE_'atype_name`) && defined (HAVE_'rtype_name`)
     33 
     34 static inline int
     35 compare_fcn (const 'atype_name` *a, const 'atype_name` *b, gfc_charlen_type n)
     36 {
     37   if (sizeof ('atype_name`) == 1)
     38     return memcmp (a, b, n);
     39   else
     40     return memcmp_char4 (a, b, n);
     41 }
     42 
     43 extern 'rtype_name` 'name`'rtype_qual`_'atype_code` ('atype` * const restrict'back_arg`,
     44        gfc_charlen_type);
     45 export_proto('name`'rtype_qual`_'atype_code`);
     46 
     47 'rtype_name`
     48 'name`'rtype_qual`_'atype_code` ('atype` * const restrict array'back_arg`,
     49 				gfc_charlen_type len)
     50 {
     51   index_type ret;
     52   index_type sstride;
     53   index_type extent;
     54   const 'atype_name` *src;
     55   const 'atype_name` *minval;
     56   index_type i;
     57 
     58   extent = GFC_DESCRIPTOR_EXTENT(array,0);
     59   if (extent <= 0)
     60     return 0;
     61 
     62   sstride = GFC_DESCRIPTOR_STRIDE(array,0) * len;
     63 
     64   ret = 1;
     65   src = array->base_addr;
     66   minval = NULL;
     67   for (i=1; i<=extent; i++)
     68     {
     69       if (minval == NULL || (back ? compare_fcn (src, minval, len) <= 0 :
     70       	 	    	    	    compare_fcn (src, minval, len) < 0))
     71       {
     72 	 ret = i;
     73 	 minval = src;
     74       }
     75       src += sstride;
     76     }
     77   return ret;
     78 }
     79 
     80 extern 'rtype_name` m'name`'rtype_qual`_'atype_code` ('atype` * const restrict,
     81                     gfc_array_l1 *const restrict mask'back_arg`,
     82 		    gfc_charlen_type);
     83 export_proto(m'name`'rtype_qual`_'atype_code`);
     84 
     85 'rtype_name`
     86 m'name`'rtype_qual`_'atype_code` ('atype` * const restrict array,
     87 				 gfc_array_l1 * const restrict mask'back_arg`,
     88 				 gfc_charlen_type len)
     89 {
     90   index_type ret;
     91   index_type sstride;
     92   index_type extent;
     93   const 'atype_name` *src;
     94   const 'atype_name` *maxval;
     95   index_type i, j;
     96   GFC_LOGICAL_1 *mbase;
     97   int mask_kind;
     98   index_type mstride;
     99 
    100   extent = GFC_DESCRIPTOR_EXTENT(array,0);
    101   if (extent <= 0)
    102     return 0;
    103 
    104   sstride = GFC_DESCRIPTOR_STRIDE(array,0) * len;
    105 
    106   mask_kind = GFC_DESCRIPTOR_SIZE (mask);
    107   mbase = mask->base_addr;
    108 
    109   if (mask_kind == 1 || mask_kind == 2 || mask_kind == 4 || mask_kind == 8
    110 #ifdef HAVE_GFC_LOGICAL_16
    111       || mask_kind == 16
    112 #endif
    113       )
    114     mbase = GFOR_POINTER_TO_L1 (mbase, mask_kind);
    115   else
    116     internal_error (NULL, "Funny sized logical array");
    117 
    118   mstride = GFC_DESCRIPTOR_STRIDE_BYTES(mask,0);
    119 
    120   /* Search for the first occurrence of a true element in mask. */
    121   for (j=0; j<extent; j++)
    122     {
    123       if (*mbase)
    124         break;
    125       mbase += mstride;
    126     }
    127 
    128   if (j == extent)
    129     return 0;
    130 
    131   ret = j + 1;
    132   src = array->base_addr + j * sstride;
    133   maxval = src;
    134 
    135   for (i=j+1; i<=extent; i++)
    136     {
    137 
    138       if (*mbase && (back ? compare_fcn (src, maxval, len) <= 0 :
    139       	 	    	    compare_fcn (src, maxval, len) < 0))
    140       {
    141 	 ret = i;
    142 	 maxval = src;
    143       }
    144       src += sstride;
    145       mbase += mstride;
    146     }
    147   return ret;
    148 }
    149 
    150 extern 'rtype_name` s'name`'rtype_qual`_'atype_code` ('atype` * const restrict,
    151        		    	GFC_LOGICAL_4 *mask'back_arg`, gfc_charlen_type);
    152 export_proto(s'name`'rtype_qual`_'atype_code`);
    153 
    154 'rtype_name`
    155 s'name`'rtype_qual`_'atype_code` ('atype` * const restrict array,
    156 				 GFC_LOGICAL_4 *mask'back_arg`, gfc_charlen_type len)
    157 {
    158   if (mask == NULL || *mask)
    159     return 'name`'rtype_qual`_'atype_code` (array, back, len);
    160   else
    161     return 0;
    162 }
    163 
    164 #endif'
    165