From 932544efa469568525455bcb53d4eabeba0eb295 Mon Sep 17 00:00:00 2001 From: Adhemerval Zanella Date: Wed, 3 Apr 2024 16:39:18 -0300 Subject: math: x86 floor traps when FE_INEXACT is enabled (BZ 31601) The implementations of floor functions using x87 floating point (i386 and 86_64 long double only) traps when FE_INEXACT is enabled. Although this is a GNU extension outside the scope of the C standard, other architectures that also support traps do not show this behavior. The fix moves the implementation to a common one that holds any exceptions with a 'fnclex' (libc_feholdexcept_setround_387). Checked on x86_64-linux-gnu and i686-linux-gnu. Reviewed-by: H.J. Lu --- math/Makefile | 2 ++ math/test-floor-except-2.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 69 insertions(+) create mode 100644 math/test-floor-except-2.c (limited to 'math') diff --git a/math/Makefile b/math/Makefile index d2a740eebe..121fe2881a 100644 --- a/math/Makefile +++ b/math/Makefile @@ -511,6 +511,7 @@ tests = \ test-fetestexceptflag \ test-fexcept \ test-fexcept-traps \ + test-floor-except-2 \ test-flt-eval-method \ test-fp-ilogb-constants \ test-fp-llogb-constants \ @@ -991,6 +992,7 @@ CFLAGS-test-fe-snans-always-signal.c += $(config-cflags-signaling-nans) CFLAGS-test-nan-const.c += -fno-builtin CFLAGS-test-ceil-except-2.c += -fno-builtin +CFLAGS-test-floor-except-2.c += -fno-builtin include ../Rules diff --git a/math/test-floor-except-2.c b/math/test-floor-except-2.c new file mode 100644 index 0000000000..d99e835909 --- /dev/null +++ b/math/test-floor-except-2.c @@ -0,0 +1,67 @@ +/* Test floor functions do not disable exception traps. + Copyright (C) 2024 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include +#include + +#ifndef FE_INEXACT +# define FE_INEXACT 0 +#endif + +#define TEST_FUNC(NAME, FLOAT, SUFFIX) \ +static int \ +NAME (void) \ +{ \ + int result = 0; \ + volatile FLOAT a, b __attribute__ ((unused)); \ + a = 1.5; \ + /* floor must work when traps on "inexact" are enabled. */ \ + b = floor ## SUFFIX (a); \ + /* And it must have left those traps enabled. */ \ + if (fegetexcept () == FE_INEXACT) \ + puts ("PASS: " #FLOAT); \ + else \ + { \ + puts ("FAIL: " #FLOAT); \ + result = 1; \ + } \ + return result; \ +} + +TEST_FUNC (float_test, float, f) +TEST_FUNC (double_test, double, ) +TEST_FUNC (ldouble_test, long double, l) + +static int +do_test (void) +{ + if (feenableexcept (FE_INEXACT) == -1) + { + puts ("enabling FE_INEXACT traps failed, cannot test"); + return 77; + } + int result = float_test (); + feenableexcept (FE_INEXACT); + result |= double_test (); + feenableexcept (FE_INEXACT); + result |= ldouble_test (); + return result; +} + +#include -- cgit 1.4.1