Mercurial > octave
view m4/octave_blas_f77_func.m4 @ 30937:85a67c1a5712
besselj.cc: Improve input validation for function airy (bug #62321)
besselj.cc: Also expand function docstring and reduce duplicated code
author | Arun Giridhar <arungiridhar@gmail.com> |
---|---|
date | Sat, 16 Apr 2022 11:08:32 -0400 |
parents | f19e621d7f2d |
children | 1077a1c277fb |
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# OCTAVE_BLAS_F77_FUNC # # The same as AX_BLAS_F77_FUNC (described below) except attempt to # determine whether the BLAS library uses 32- or 64-bit integers instead # of failing if the default size of Fortran integers does not appear to # match the size of integers used by the BLAS library. # =========================================================================== # https://www.gnu.org/software/autoconf-archive/ax_blas_f77_func.html # =========================================================================== # # SYNOPSIS # # AX_BLAS_F77_FUNC([ACTION-IF-PASS[, ACTION-IF-FAIL[, ACTION-IF-CROSS-COMPILING]]) # AX_BLAS_WITH_F77_FUNC([ACTION-IF-FOUND-AND-PASS[, ACTION-IF-NOT-FOUND-OR-FAIL]]) # # DESCRIPTION # # These macros are intended as a supplement to the AX_BLAS macro, to # verify that BLAS functions are properly callable from Fortran. This is # necessary, for example, if you want to build the LAPACK library on top # of the BLAS. # # AX_BLAS_F77_FUNC uses the defined BLAS_LIBS and Fortran environment to # check for compatibility, and takes a specific action in case of success, # resp. failure, resp. cross-compilation. # # AX_BLAS_WITH_F77_FUNC is a drop-in replacement wrapper for AX_BLAS that # calls AX_BLAS_F77_FUNC after detecting a BLAS library and rejects it on # failure (i.e. pretends that no library was found). # # LICENSE # # Copyright (c) 2008 Jaroslav Hajek <highegg@gmail.com> # # 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, either version 3 of the License, or (at your # option) any later version. # # 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, see <https://www.gnu.org/licenses/>. # # As a special exception, the respective Autoconf Macro's copyright owner # gives unlimited permission to copy, distribute and modify the configure # scripts that are the output of Autoconf when processing the Macro. You # need not follow the terms of the GNU General Public License when using # or distributing such scripts, even though portions of the text of the # Macro appear in them. The GNU General Public License (GPL) does govern # all other use of the material that constitutes the Autoconf Macro. # # This special exception to the GPL applies to versions of the Autoconf # Macro released by the Autoconf Archive. When you make and distribute a # modified version of the Autoconf Macro, you may extend this special # exception to the GPL to apply to your modified version as well. #serial 8 ## Derived from AC_DEFUN([OCTAVE_BLAS_F77_FUNC], [ AC_PREREQ(2.50) AC_REQUIRE([AX_BLAS]) # F77 call-compatibility checks if test "$cross_compiling" = yes ; then ifelse($3, ,$1,$3) elif test x"$ax_blas_ok" = xyes; then save_ax_blas_f77_func_LIBS="$LIBS" LIBS="$BLAS_LIBS $LIBS" AC_LANG_PUSH(Fortran 77) # LSAME check (LOGICAL return values) AC_MSG_CHECKING([whether LSAME is called correctly from Fortran]) AC_RUN_IFELSE(AC_LANG_PROGRAM(,[[ logical lsame,w external lsame character c1,c2 c1 = 'A' c2 = 'B' w = lsame(c1,c2) if (w) stop 1 w = lsame(c1,c1) if (.not. w) stop 1 ]]),[ax_blas_lsame_fcall_ok=yes], [ax_blas_lsame_fcall_ok=no]) AC_MSG_RESULT([$ax_blas_lsame_fcall_ok]) # ISAMAX check (INTEGER return values) AC_MSG_CHECKING([whether ISAMAX is called correctly from Fortran]) AC_RUN_IFELSE(AC_LANG_PROGRAM(,[[ integer isamax,i external isamax real a(2) a(1) = 1e0 a(2) = -2e0 i = isamax(2,a,1) if (i.ne.2) stop 1 ]]),[ax_blas_isamax_fcall_ok=yes], [ax_blas_isamax_fcall_ok=no]) AC_MSG_RESULT([$ax_blas_isamax_fcall_ok]) # SDOT check (REAL return values) AC_MSG_CHECKING([whether SDOT is called correctly from Fortran]) AC_RUN_IFELSE(AC_LANG_PROGRAM(,[[ real sdot,a(1),b(1),w external sdot a(1) = 1e0 b(1) = 2e0 w = sdot(1,a,1,b,1) if (w .ne. a(1)*b(1)) stop 1 ]]),[ax_blas_sdot_fcall_ok=yes], [ax_blas_sdot_fcall_ok=no]) AC_MSG_RESULT([$ax_blas_sdot_fcall_ok]) # DDOT check (DOUBLE return values) AC_MSG_CHECKING([whether DDOT is called correctly from Fortran]) AC_RUN_IFELSE(AC_LANG_PROGRAM(,[[ double precision ddot,a(1),b(1),w external ddot a(1) = 1d0 b(1) = 2d0 w = ddot(1,a,1,b,1) if (w .ne. a(1)*b(1)) stop 1 ]]),[ax_blas_ddot_fcall_ok=yes], [ax_blas_ddot_fcall_ok=no]) AC_MSG_RESULT([$ax_blas_ddot_fcall_ok]) # CDOTU check (COMPLEX return values) AC_MSG_CHECKING([whether CDOTU is called correctly from Fortran]) AC_RUN_IFELSE(AC_LANG_PROGRAM(,[[ complex cdotu,a(1),b(1),w external cdotu a(1) = cmplx(1e0,1e0) b(1) = cmplx(1e0,2e0) w = cdotu(1,a,1,b,1) if (w .ne. a(1)*b(1)) stop 1 ]]),[ax_blas_cdotu_fcall_ok=yes], [ax_blas_cdotu_fcall_ok=no]) AC_MSG_RESULT([$ax_blas_cdotu_fcall_ok]) # ZDOTU check (DOUBLE COMPLEX return values) AC_MSG_CHECKING([whether ZDOTU is called correctly from Fortran]) AC_RUN_IFELSE(AC_LANG_PROGRAM(,[[ double complex zdotu,a(1),b(1),w external zdotu a(1) = dcmplx(1d0,1d0) b(1) = dcmplx(1d0,2d0) w = zdotu(1,a,1,b,1) if (w .ne. a(1)*b(1)) stop 1 ]]),[ax_blas_zdotu_fcall_ok=yes], [ax_blas_zdotu_fcall_ok=no]) AC_MSG_RESULT([$ax_blas_zdotu_fcall_ok]) # Check BLAS library integer size. If it does not appear to be # 8 bytes, we assume it is 4 bytes. # FIXME: this may fail with things like -ftrapping-math. AC_MSG_CHECKING([BLAS library integer size]) AC_RUN_IFELSE(AC_LANG_PROGRAM(,[[ integer*8 two, n integer*4 n2(2) double precision d, a(1), b(1), ddot equivalence (n, n2) a(1) = 1.0 b(1) = 1.0 c Generate 2**32 + 1 in an 8-byte integer. Whether we have a big c endian or little endian system, both 4-byte words of this value c should be 1. two = 2 n = (two ** 32) + 1 c Check that our expectation about the type conversions are correct. if (n2(1) .ne. 1 .or. n2(2) .ne. 1) then print *, 'invalid assumption about integer type conversion' stop 2 endif * print *, n, n2(1), n2(2) * print *, a(1), b(1) c DDOT will either see 1 or a large value for N. Since INCX and INCY c are both 0, we will never increment the index, so A and B only need to c have a single element. If N is interpreted as 1 (BLAS compiled with 4 c byte integers) then the result will be 1. If N is interpreted as a c large value (BLAS compiled with 8 byte integers) then the result will c be the summation a(1)*b(1) 2^32+1 times. This will also take some c time to compute, but at least for now it is the unusual case so we are c much more likely to exit quickly after detecting that the BLAS library c was compiled with 4-byte integers. d = ddot (n, a, 0, b, 0) * print *, a(1), b(1), d c Success (0 exit status) means we detected BLAS compiled with c 8-byte integers. if (d .eq. 1.0) then stop 1 endif ]]),[ax_blas_integer_size=8], [ax_blas_integer_size=4]) AC_MSG_RESULT([$ax_blas_integer_size]) AC_LANG_POP(Fortran 77) # if any of the tests failed, reject the BLAS library if test $ax_blas_lsame_fcall_ok = yes \ -a $ax_blas_sdot_fcall_ok = yes \ -a $ax_blas_ddot_fcall_ok = yes \ -a $ax_blas_cdotu_fcall_ok = yes \ -a $ax_blas_zdotu_fcall_ok = yes ; then ax_blas_f77_func_ok=yes; $1 else ax_blas_f77_func_ok=no; $2 fi LIBS="$save_ax_blas_f77_func_LIBS" fi ])dnl AX_BLAS_F77_FUNC AC_DEFUN([OCTAVE_BLAS_WITH_F77_FUNC], [ AC_PREREQ(2.50) AX_BLAS([# disable special action], []) if test x$ax_blas_ok = xyes ; then OCTAVE_BLAS_F77_FUNC( [ifelse([$1],,AC_DEFINE(HAVE_BLAS,1,[Define if you have a BLAS library.]),[$1])], [ax_blas_ok=no; BLAS_LIBS=]) fi if test x$ax_blas_ok = xno ; then : $2 fi ])dnl AX_BLAS_WITH_F77_FUNC