derek.holloway
7502bf64a4
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55 lines
2.2 KiB
Plaintext
55 lines
2.2 KiB
Plaintext
# fpieee.m4 serial 2 -*- coding: utf-8 -*-
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dnl Copyright (C) 2007, 2009-2022 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl IEEE 754 standardized three items:
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dnl - The formats of single-float and double-float - nowadays commonly
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dnl available as 'float' and 'double' in C and C++.
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dnl No autoconf test needed.
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dnl - The overflow and division by zero behaviour: The result are values
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dnl '±Inf' and 'NaN', rather than exceptions as it was before.
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dnl This file provides an autoconf macro for ensuring this behaviour of
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dnl floating-point operations.
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dnl - A set of conditions (overflow, underflow, inexact, etc.) which can
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dnl be configured to trigger an exception.
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dnl This cannot be done in a portable way: it depends on the compiler,
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dnl libc, kernel, and CPU. No autoconf macro is provided for this.
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dnl Ensure non-trapping behaviour of floating-point overflow and
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dnl floating-point division by zero.
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dnl (For integer overflow, see gcc's -ftrapv option; for integer division by
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dnl zero, see the autoconf macro in intdiv0.m4.)
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AC_DEFUN([gl_FP_IEEE],
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[
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AC_REQUIRE([AC_PROG_CC])
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AC_REQUIRE([AC_CANONICAL_HOST])
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# IEEE behaviour is the default on all CPUs except Alpha and SH
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# (according to the test results of Bruno Haible's ieeefp/fenv_default.m4
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# and the GCC 4.1.2 manual).
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case "$host_cpu" in
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alpha*)
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# On Alpha systems, a compiler option provides the behaviour.
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# See the ieee(3) manual page, also available at
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# <https://backdrift.org/man/tru64/man3/ieee.3.html>
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if test -n "$GCC"; then
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# GCC has the option -mieee.
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# For full IEEE compliance (rarely needed), use option -mieee-with-inexact.
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CPPFLAGS="$CPPFLAGS -mieee"
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else
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# Compaq (ex-DEC) C has the option -ieee, equivalent to -ieee_with_no_inexact.
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# For full IEEE compliance (rarely needed), use option -ieee_with_inexact.
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CPPFLAGS="$CPPFLAGS -ieee"
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fi
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;;
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sh*)
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if test -n "$GCC"; then
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# GCC has the option -mieee.
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CPPFLAGS="$CPPFLAGS -mieee"
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fi
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;;
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esac
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])
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