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5220a1aa8d
I noticed that there was no meaningful test coverage for fegetexceptflag and fesetexceptflag (one test ensures that calls to them compile and link, but nothing to verify they work correctly). This patch adds tests for these functions. fesetexceptflag is meant to set the relevant exception flag bits to the saved state without causing enabled traps to be taken. On some architectures, it is not possible to set exception flag bits without causing enabled traps to occur. Such architectures need to define EXCEPTION_SET_FORCES_TRAP to 1 in their math-tests.h, as is done in this patch for powerpc. x86 avoids needing to define this because the traps resulting from setting exception bits don't occur until the next floating-point operation or fwait instruction. Tested for x86_64, x86 and powerpc. Note that test-fexcept fails for powerpc because of a pre-existing bug in fesetexceptflag for powerpc, which I'll fix separately. * math/test-fexcept-traps.c: New file. * math/test-fexcept.c: Likewise. * math/Makefile (tests): Add test-fexcept and test-fexcept-traps. * sysdeps/generic/math-tests.h (EXCEPTION_SET_FORCES_TRAP): New macro. * sysdeps/powerpc/math-tests.h [!__NO_FPRS__] (EXCEPTION_SET_FORCES_TRAP): Likewise.
34 lines
1.4 KiB
C
34 lines
1.4 KiB
C
/* Configuration for math tests. PowerPC version.
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Copyright (C) 2013-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* On PowerPC, in versions of GCC up to at least 4.7.2, a type cast -- which is
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a IEEE 754-2008 general-computational convertFormat operation (IEEE
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754-2008, 5.4.2) -- does not turn a sNaN into a qNaN (whilst raising an
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INVALID exception), which is contrary to IEEE 754-2008 5.1 and 7.2. This
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renders certain tests infeasible in this scenario.
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<http://gcc.gnu.org/PR56828>. */
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#define SNAN_TESTS_TYPE_CAST 0
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#ifndef __NO_FPRS__
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/* Setting exception flags in FPSCR results in enabled traps for those
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exceptions being taken. */
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# define EXCEPTION_SET_FORCES_TRAP 1
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#endif
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#include_next <math-tests.h>
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