/* Test of rounding towards negative infinity. Copyright (C) 2010-2024 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 . */ #include #include #include "isnanf-nolibm.h" #include "minus-zero.h" #include "infinity.h" #include "nan.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, _GL_UNUSED char **argv) { float (* volatile 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)); /* [MX] shaded specification in POSIX. */ /* NaN. */ ASSERT (isnanf (floorf (NaNf ()))); /* Infinity. */ ASSERT (floorf (Infinityf ()) == Infinityf ()); ASSERT (floorf (- Infinityf ()) == - Infinityf ()); return 0; }