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Fix default float_t definition (bug 20855).
The default (top-level) version of bits/mathdef.h defines float_t to double. It is used on ColdFire, MicroBlaze, Nios II and SH3, all of which define FLT_EVAL_METHOD to 0, so float_t should be float (and C11 requires a certain correspondence between these typedefs and FLT_EVAL_METHOD values). I proposed fixing this default in <https://sourceware.org/ml/libc-alpha/2015-01/msg00499.html>, with no objections from architecture maintainers, and this patch makes that fix. As noted in the NEWS entry added, this might affect the ABIs of non-glibc libraries (ImageMagick has been mentioned in gcc-patches discussion of the S/390 case - which is unaffected by this patch), but as noted in my previous message, affected libraries would have problems with -mfpmath=sse anyway on 32-bit x86. A (compilation) testcase is added to verify the required correspondence of typedefs to FLT_EVAL_METHOD values. This test is built with -fexcess-precision=standard to avoid any issues with GCC 7 on S/390 providing a more accurate FLT_EVAL_METHOD definition in the default (no excess precision) mode. (This will also be usable to test a fix for the recently reported bug about these typedefs on x86_64 -mfpmath=387, as architecture-specific tests can be added that It is entirely possible that the fixed default makes some architecture-specific versions of bits/mathdef.h semantically equivalent to the default version and so no longer required. I don't intend to investigate that separately from the refactoring I proposed in <https://sourceware.org/ml/libc-alpha/2016-11/msg00745.html>, which will create as few header variants as possible for each group of definitions. Tested (compilation only) with build-many-glibcs.py. [BZ #20855] * bits/mathdef.h (float_t): Define to float. * math/test-flt-eval-method.c: New file. * math/Makefile (tests): Add test-flt-eval-method. (CFLAGS-test-flt-eval-method.c): New variable.
This commit is contained in:
Joseph Myers
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@ -1,3 +1,11 @@
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2016-11-23 Joseph Myers <joseph@codesourcery.com>
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[BZ #20855]
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* bits/mathdef.h (float_t): Define to float.
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* math/test-flt-eval-method.c: New file.
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* math/Makefile (tests): Add test-flt-eval-method.
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(CFLAGS-test-flt-eval-method.c): New variable.
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2016-11-22 Steve Ellcey <sellcey@caviumnetworks.com>
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* sysdeps/unix/sysv/linux/fstatfs64.c: Hide prototypes for fstatfs
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5
NEWS
5
NEWS
@ -65,6 +65,11 @@ Version 2.25
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- NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
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setpayloadf, setpayloadl.
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* On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
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to float instead of double. This does not affect the ABI of any libraries
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that are part of the GNU C Library, but may affect the ABI of other
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libraries that use this type in their interfaces.
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* The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
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are added to libc. They convert a floating-point number into string.
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@ -22,10 +22,10 @@
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#if defined __USE_ISOC99 && defined _MATH_H && !defined _MATH_H_MATHDEF
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# define _MATH_H_MATHDEF 1
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/* Normally, there is no long double type and the `float' and `double'
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expressions are evaluated as `double'. */
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typedef double float_t; /* `float' expressions are evaluated as
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`double'. */
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/* Expressions are evaluated with the range and precision of their
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type. */
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typedef float float_t; /* `float' expressions are evaluated as
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`float'. */
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typedef double double_t; /* `double' expressions are evaluated as
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`double'. */
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@ -158,7 +158,7 @@ tests = test-matherr test-fenv atest-exp atest-sincos atest-exp2 basic-test \
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test-fexcept test-fexcept-traps test-fesetexcept \
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test-fesetexcept-traps test-fetestexceptflag test-femode \
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test-femode-traps test-iszero-excess-precision \
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test-iseqsig-excess-precision $(tests-static)
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test-iseqsig-excess-precision test-flt-eval-method $(tests-static)
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tests-static = test-fpucw-static test-fpucw-ieee-static \
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test-signgam-uchar-static test-signgam-uchar-init-static \
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test-signgam-uint-static test-signgam-uint-init-static \
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@ -271,6 +271,7 @@ CFLAGS-test-math-iszero.cc = -std=gnu++11
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CFLAGS-test-iszero-excess-precision.c = -fexcess-precision=standard
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CFLAGS-test-iseqsig-excess-precision.c = -fexcess-precision=standard
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CFLAGS-test-flt-eval-method.c = -fexcess-precision=standard
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# The -lieee module sets the _LIB_VERSION_ switch to IEEE mode
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# for error handling in the -lm functions.
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65
math/test-flt-eval-method.c
Normal file
65
math/test-flt-eval-method.c
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/* Test evaluation method typedefs match FLT_EVAL_METHOD.
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Copyright (C) 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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#include <float.h>
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#include <math.h>
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#if FLT_EVAL_METHOD == -1
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/* Cannot test. */
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typedef float_t my_float_t;
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typedef double_t my_double_t;
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#elif FLT_EVAL_METHOD == 0 || FLT_EVAL_METHOD == 16
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typedef float my_float_t;
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typedef double my_double_t;
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#elif FLT_EVAL_METHOD == 1
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typedef double my_float_t;
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typedef double my_double_t;
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#elif FLT_EVAL_METHOD == 2
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typedef long double my_float_t;
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typedef long double my_double_t;
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#elif FLT_EVAL_METHOD == 32
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typedef _Float32 my_float_t;
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typedef double my_double_t;
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#elif FLT_EVAL_METHOD == 33
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typedef _Float32x my_float_t;
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typedef _Float32x my_double_t;
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#elif FLT_EVAL_METHOD == 64
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typedef _Float64 my_float_t;
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typedef _Float64 my_double_t;
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#elif FLT_EVAL_METHOD == 65
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typedef _Float64x my_float_t;
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typedef _Float64x my_double_t;
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#elif FLT_EVAL_METHOD == 128
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typedef _Float128 my_float_t;
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typedef _Float128 my_double_t;
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#elif FLT_EVAL_METHOD == 129
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typedef _Float128x my_float_t;
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typedef _Float128x my_double_t;
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#else
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# error "Unknown FLT_EVAL_METHOD"
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#endif
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extern float_t test_float_t;
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extern my_float_t test_float_t;
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extern double_t test_double_t;
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extern my_double_t test_double_t;
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/* This is a compilation test. */
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#define TEST_FUNCTION 0
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#include "../test-skeleton.c"
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