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* these are dependencies for gcc 4 Graphite engine build. * CLooG 0.18.0 includes ISL 0.11.1 which is the backend that the build script enables. * PPL is needed by GCC build even if it isn't the chosen backend.
132 lines
3.5 KiB
Plaintext
132 lines
3.5 KiB
Plaintext
dnl A function to detect whether C++ provides exact output for floats.
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dnl Copyright (C) 2001-2010 Roberto Bagnara <bagnara@cs.unipr.it>
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dnl Copyright (C) 2010-2011 BUGSENG srl (http://bugseng.com)
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dnl
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dnl This file is part of the Parma Polyhedra Library (PPL).
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dnl
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dnl The PPL is free software; you can redistribute it and/or modify it
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dnl under the terms of the GNU General Public License as published by the
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dnl Free Software Foundation; either version 3 of the License, or (at your
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dnl option) any later version.
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dnl
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dnl The PPL is distributed in the hope that it will be useful, but WITHOUT
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dnl ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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dnl FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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dnl for more details.
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dnl
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dnl You should have received a copy of the GNU General Public License
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dnl along with this program; if not, write to the Free Software Foundation,
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dnl Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1307, USA.
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dnl
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dnl For the most up-to-date information see the Parma Polyhedra Library
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dnl site: http://www.cs.unipr.it/ppl/ .
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AC_DEFUN([AC_CXX_FLOAT_EXACT_OUTPUT],
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[
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dnl AC_REQUIRE([AC_CXX_FLOAT_BINARY_FORMAT])
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ac_save_CPPFLAGS="$CPPFLAGS"
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ac_save_LIBS="$LIBS"
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AC_LANG_PUSH(C++)
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AC_MSG_CHECKING([whether C++ provides exact output for floats])
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AC_RUN_IFELSE([AC_LANG_SOURCE([[
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#include <limits>
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#ifdef HAVE_STDINT_H
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#ifndef __STDC_LIMIT_MACROS
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#define __STDC_LIMIT_MACROS 1
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#endif
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#include <stdint.h>
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#endif
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#ifdef HAVE_INTTYPES_H
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#include <inttypes.h>
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#endif
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#include <sstream>
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/* Unique (nonzero) code for the IEEE 754 Single Precision
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floating point format. */
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# define PPL_FLOAT_IEEE754_SINGLE 1
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/* Unique (nonzero) code for the IEEE 754 Double Precision
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floating point format. */
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# define PPL_FLOAT_IEEE754_DOUBLE 2
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/* Unique (nonzero) code for the IEEE 754 Quad Precision
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floating point format. */
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# define PPL_FLOAT_IEEE754_QUAD 3
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/* Unique (nonzero) code for the Intel Double-Extended
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floating point format. */
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# define PPL_FLOAT_INTEL_DOUBLE_EXTENDED 4
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bool
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check(float value, const char* text) {
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std::ostringstream ss;
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ss.precision(10000);
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ss << value;
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return ss.str() == text;
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}
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#if SIZEOF_FLOAT == 4
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float
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convert(uint32_t x) {
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union {
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float value;
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uint32_t word;
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} u;
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u.word = x;
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return u.value;
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}
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#if PPL_CXX_FLOAT_BINARY_FORMAT == PPL_FLOAT_IEEE754_SINGLE
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int
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main() {
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if (check(convert(0xaaacccaaU),
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"-3.069535185924732179074680971098132431507110595703125e-13")
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&& check(convert(0xcccaaaccU),
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"-106255968")
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&& check(convert(0x00000001U),
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"1.40129846432481707092372958328991613128026194187651577175706828388979108268586060148663818836212158203125e-45")
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&& check(convert(0x80000001U),
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"-1.40129846432481707092372958328991613128026194187651577175706828388979108268586060148663818836212158203125e-45"))
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return 0;
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else
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return 1;
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}
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#else // PPL_CXX_FLOAT_BINARY_FORMAT != FLOAT_IEEE754_SINGLE
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int
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main() {
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return 1;
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}
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#endif // PPL_CXX_FLOAT_BINARY_FORMAT != FLOAT_IEEE754_SINGLE
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#else // SIZEOF_FLOAT != 4
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int
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main() {
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return 1;
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}
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#endif // SIZEOF_FLOAT != 4
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]])],
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AC_MSG_RESULT(yes)
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ac_cxx_float_exact_output=1,
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AC_MSG_RESULT(no)
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ac_cxx_float_exact_output=0,
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AC_MSG_RESULT([assuming not])
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ac_cxx_float_exact_output=0)
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AC_DEFINE_UNQUOTED(PPL_CXX_FLOAT_EXACT_OUTPUT, $ac_cxx_float_exact_output,
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[Not zero if C++ supports exact output for floats.])
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AC_LANG_POP(C++)
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CPPFLAGS="$ac_save_CPPFLAGS"
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LIBS="$ac_save_LIBS"
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])
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