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Make cacosh (0 + iNaN) return NaN + i pi/2 (bug 22561, DR#471).

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As per C11 DR#471 (adjusted resolution accepted for C17), cacosh (0 +
iNaN) should return NaN +/- i pi/2, not NaN + iNaN.

This patch fixes the code accordingly.  The test has hardcoded the
result with positive sign of the imaginary part (with an associated
comment), since the unspecified sign for a result other than 0 or
infinity isn't currently supported by the test infrastructure.

Tested for x86_64.

	[BZ #22561]
	* math/s_cacosh_template.c (M_DECL_FUNC (__cacosh)): Use pi/2 for
	real part of result for argument 0 + i * NaN.
	* math/libm-test-cacosh.inc (cacosh_test_data): Update expected
	results for tests of 0 + i * NaN.
This commit is contained in:
Joseph Myers 2017-12-06 21:35:20 +00:00
parent d73fac82be
commit 5244527da1
3 changed files with 19 additions and 3 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2017-12-06 Joseph Myers <joseph@codesourcery.com>
[BZ #22561]
* math/s_cacosh_template.c (M_DECL_FUNC (__cacosh)): Use pi/2 for
real part of result for argument 0 + i * NaN.
* math/libm-test-cacosh.inc (cacosh_test_data): Update expected
results for tests of 0 + i * NaN.
2017-12-06 Adhemerval Zanella <adhemerval.zanella@linaro.org>
* sysdeps/alpha/fpu/libm-test-ulps: Update.

9
math/libm-test-cacosh.inc
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@ -46,8 +46,13 @@ static const struct test_c_c_data cacosh_test_data[] =
TEST_c_c (cacosh, plus_infty, qnan_value, plus_infty, qnan_value),
TEST_c_c (cacosh, minus_infty, qnan_value, plus_infty, qnan_value),
TEST_c_c (cacosh, 0, qnan_value, qnan_value, qnan_value),
TEST_c_c (cacosh, minus_zero, qnan_value, qnan_value, qnan_value),
/* The sign of the imaginary part of the result is unspecified
(see
<http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2173.htm>),
but the libm-test infrastructure does not support describing
that. */
TEST_c_c (cacosh, 0, qnan_value, qnan_value, lit_pi_2_d),
TEST_c_c (cacosh, minus_zero, qnan_value, qnan_value, lit_pi_2_d),
TEST_c_c (cacosh, qnan_value, plus_infty, plus_infty, qnan_value),
TEST_c_c (cacosh, qnan_value, minus_infty, plus_infty, qnan_value),

5
math/s_cacosh_template.c
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@ -57,7 +57,10 @@ M_DECL_FUNC (__cacosh) (CFLOAT x)
else
{
__real__ res = M_NAN;
__imag__ res = M_NAN;
if (rcls == FP_ZERO)
__imag__ res = M_MLIT (M_PI_2);
else
__imag__ res = M_NAN;
}
}
else if (rcls == FP_ZERO && icls == FP_ZERO)