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annotate m4/octave_blas.m4 @ 31142:6308ce73bdca

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build: Allow setting BLAS integer size as configure argument (bug #62715). * m4/octave-blas.m4: Allow setting BLAS integer size as configure argument when cross compiling.
author Markus Mützel <markus.muetzel@gmx.de>
date Sun, 10 Jul 2022 17:34:12 +0200
parents 1d61c36bb34a
children
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1d61c36bb34a build: Uspdate Copyright notices for acinclude.m4, octave_blas.m4.
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1 dnl --------------------------------------------------------------------
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2 dnl
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3 dnl Copyright (C) 2022 The Octave Project Developers
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4 dnl
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5 dnl See the file COPYRIGHT.md in the top-level directory of this
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6 dnl distribution or <https://octave.org/copyright/>.
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7 dnl
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8 dnl This file is part of Octave.
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9 dnl
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10 dnl Octave is free software: you can redistribute it and/or modify it
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11 dnl under the terms of the GNU General Public License as published by
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12 dnl the Free Software Foundation, either version 3 of the License, or
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13 dnl (at your option) any later version.
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14 dnl
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15 dnl Octave is distributed in the hope that it will be useful, but
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16 dnl WITHOUT ANY WARRANTY; without even the implied warranty of
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17 dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 dnl GNU General Public License for more details.
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19 dnl
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20 dnl You should have received a copy of the GNU General Public License
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21 dnl along with Octave; see the file COPYING. If not, see
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22 dnl <https://www.gnu.org/licenses/>.
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23 dnl
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24 dnl --------------------------------------------------------------------
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25 dnl
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26 dnl Check for BLAS library and, if valid, determine integer size of library
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27 dnl
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28 AC_DEFUN([OCTAVE_BLAS], [
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29 AC_PREREQ(2.50)
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30 dnl Call reference macro to find BLAS library
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31 AX_BLAS
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32
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33 if test "$cross_compiling" = yes ; then
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34 dnl Assume BLAS library exists when cross compiling
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35 ax_blas_ok=yes
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36 AC_MSG_CHECKING([BLAS can be called from Fortran])
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37 AC_MSG_RESULT([yes assumed for cross compilation])
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38 dnl Assume generic 4-byte BLAS library if not specified
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39 AC_MSG_CHECKING([BLAS library integer size])
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40 if test -z "$ax_cv_blas_integer_size" ; then
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41 ax_cv_blas_integer_size=4
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42 fi
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43 AC_MSG_RESULT([$ax_cv_blas_integer_size assumed for cross compilation])
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44 elif test $ax_blas_ok = yes; then
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45 ac_octave_save_LIBS="$LIBS"
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46 LIBS="$BLAS_LIBS $LIBS"
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47 AC_LANG_PUSH(Fortran 77)
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48 ## Check BLAS library integer size.
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49 ## If it does not appear to be 8 bytes, we assume it is 4 bytes.
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50 ## FIXME: this may fail with options like -ftrapping-math.
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51 AC_CACHE_CHECK([BLAS library integer size],
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52 [ax_cv_blas_integer_size],
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53 [AC_RUN_IFELSE([AC_LANG_PROGRAM(,[[
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54 integer*8 two, n
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55 integer*4 n2(2)
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56 double precision d, a(1), b(1), ddot
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57 equivalence (n, n2)
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58
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59 a(1) = 1.0
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60 b(1) = 1.0
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61
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62 c Generate 2**32 + 1 in an 8-byte integer. Whether we have a big
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63 c endian or little endian system, both 4-byte words of this value
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64 c should be 1.
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65
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66 two = 2
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67 n = (two ** 32) + 1
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68
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69 c Check that our expectation about the type conversions are correct.
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70
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71 if (n2(1) .ne. 1 .or. n2(2) .ne. 1) then
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72 print *, 'invalid assumption about integer type conversion'
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73 stop 2
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74 endif
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75
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76 * print *, n, n2(1), n2(2)
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77 * print *, a(1), b(1)
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78
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79 c DDOT will either see 1 or a large value for N. Since INCX and INCY
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80 c are both 0, we will never increment the index, so A and B only need to
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81 c have a single element. If N is interpreted as 1 (BLAS compiled with
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82 c 4-byte integers) then the result will be 1. If N is interpreted as a
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83 c large value (BLAS compiled with 8-byte integers) then the result will
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84 c be the summation a(1)*b(1) 2^32+1 times. This will also take some
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85 c time to compute, but at least for now it is the unusual case so we are
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86 c much more likely to exit quickly after detecting that the BLAS library
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87 c was compiled with 4-byte integers.
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88
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89 d = ddot (n, a, 0, b, 0)
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90
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91 * print *, a(1), b(1), d
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92
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93 c Success (0 exit status) means we detected BLAS compiled with
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94 c 8-byte integers.
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95
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96 if (d .eq. 1.0) then
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97 stop 1
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98 endif
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99
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100 ]])],
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101 ax_cv_blas_integer_size=8,
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102 ax_cv_blas_integer_size=4)
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103 ])
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104
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105 AC_LANG_POP(Fortran 77)
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106 LIBS="$ac_octave_save_LIBS"
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107 fi
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108
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109 ])