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| author | Bruno Haible <bruno@clisp.org> | 2010-12-22 16:05:29 +0100 |
|---|---|---|
| committer | Bruno Haible <bruno@clisp.org> | 2010-12-22 16:06:29 +0100 |
| commit | 9ca8092d849ed03418229af9a2aefdf784fd4db9 (patch) | |
| tree | e2814bca17c3bc52cc0476effbc507b7c4181bbe /tests/test-floorf-ieee.c | |
| parent | 6a84f05ce88c372ec7b98f9294d5b3e76bcb22ad (diff) | |
| download | gnulib-9ca8092d849ed03418229af9a2aefdf784fd4db9.tar.gz | |
floor: Implement result sign according to IEEE 754.
* lib/floor.c (FUNC): Return +0.0 for 0 < x < 1.
* tests/test-floor2.c (floor_reference): Keep in sync with lib/floor.c.
* tests/test-floorf2.c (floorf_reference): Likewise.
* tests/test-floorf-ieee.c (main): Test also values between -1 and 1.
* tests/test-floor-ieee.c (main): Likewise.
* tests/test-floorl-ieee.c (main): Likewise.
Diffstat (limited to 'tests/test-floorf-ieee.c')
| -rw-r--r-- | tests/test-floorf-ieee.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/tests/test-floorf-ieee.c b/tests/test-floorf-ieee.c index da13848738..c4925d2b17 100644 --- a/tests/test-floorf-ieee.c +++ b/tests/test-floorf-ieee.c @@ -37,9 +37,20 @@ 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; } |