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Diffstat (limited to 'gnulib/tests/test-floorf-ieee.c')
m--------- | gnulib | 0 | ||||
-rw-r--r-- | gnulib/tests/test-floorf-ieee.c | 56 |
2 files changed, 56 insertions, 0 deletions
diff --git a/gnulib b/gnulib deleted file mode 160000 -Subproject 443bc5ffcf7429e557f4a371b0661abe98ddbc1 diff --git a/gnulib/tests/test-floorf-ieee.c b/gnulib/tests/test-floorf-ieee.c new file mode 100644 index 0000000..071a130 --- /dev/null +++ b/gnulib/tests/test-floorf-ieee.c @@ -0,0 +1,56 @@ +/* Test of rounding towards negative infinity. + Copyright (C) 2010-2011 Free Software Foundation, Inc. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. */ + +#include <config.h> + +#include <math.h> + +#include "minus-zero.h" +#include "macros.h" + +/* If IEEE compliance was not requested, the ICC compiler inlines its + own floorf assembly that turns -0.0f to 0.0f; but that is a correct + result when IEEE is not enforced. To avoid spurious failure, we + have to provide this dummy function in order to outsmart ICC's + inlining, and call our floorf through a function pointer. */ +static float +dummy (float f) +{ + return 0; +} + +int +main (int argc, char **argv _GL_UNUSED) +{ + float (*my_floorf) (float) = argc ? floorf : dummy; + + /* See IEEE 754, section 6.3: + "the sign of the result of the round floating-point number to + integral value operation is the sign of the operand. These rules + shall apply even when operands or results are zero or infinite." */ + + /* Zero. */ + ASSERT (!signbit (my_floorf (0.0f))); + ASSERT (!!signbit (my_floorf (minus_zerof)) == !!signbit (minus_zerof)); + /* Positive numbers. */ + ASSERT (!signbit (my_floorf (0.3f))); + ASSERT (!signbit (my_floorf (0.7f))); + /* Negative numbers. */ + ASSERT (!!signbit (my_floorf (-0.3f)) == !!signbit (minus_zerof)); + ASSERT (!!signbit (my_floorf (-0.7f)) == !!signbit (minus_zerof)); + + return 0; +} |