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Add test case for 93fc678965 (incorrect powf(3) result)

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This adds the test case to contrib/netbsd-tests/lib/libm/t_pow.c, as it
is currently the only place testing pow(3) and friends.

MFC after:	1 week
This commit is contained in:
Dimitry Andric 2021-02-09 23:37:08 +01:00
parent 9c6954329a
commit 51af033287
1 changed files with 22 additions and 0 deletions
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22
contrib/netbsd-tests/lib/libm/t_pow.c
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@ -637,6 +637,27 @@ ATF_TC_BODY(powf_zero_y, tc)
}
}
ATF_TC(powf_near_one_x_huge_y);
ATF_TC_HEAD(powf_near_one_x_huge_y, tc)
{
atf_tc_set_md_var(tc, "descr", "Test powf(->1, huge) != inf");
}
ATF_TC_BODY(powf_near_one_x_huge_y, tc)
{
const float x = 0x1.ffffeep-1f; /* 9.999995e-01f */
const float y = -0x1.000002p+27f; /* -1.342177e+08f */
const float e = 0x1.d53532p+103f; /* 1.858724e+31f */
const float ulp = __FLT_EPSILON__;
float z;
z = powf(x, y);
ATF_CHECK(isinf(z) == 0);
ATF_CHECK(fabsf(z - e) <= 2 * ulp);
}
ATF_TP_ADD_TCS(tp)
{
@ -661,6 +682,7 @@ ATF_TP_ADD_TCS(tp)
ATF_TP_ADD_TC(tp, powf_one_pos_x);
ATF_TP_ADD_TC(tp, powf_zero_x);
ATF_TP_ADD_TC(tp, powf_zero_y);
ATF_TP_ADD_TC(tp, powf_near_one_x_huge_y);
return atf_no_error();
}