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Disable the 'nextafter' portions of these tests on PPC when using 128-bit doubles because the 'nextafter' call doesn't work right. Reviewed as https://reviews.llvm.org/D62384. Thanks to Xing Xue for the patch, and Hubert for the explanation. 

llvm-svn: 363740
This commit is contained in:
Marshall Clow 2019-06-18 21:20:02 +00:00
parent d16779a732
commit 2184374d94
1 changed files with 26 additions and 18 deletions
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44
libcxx/test/std/numerics/numeric.ops/numeric.ops.midpoint/midpoint.float.pass.cpp
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@ -92,25 +92,33 @@ void fp_test()
assert(d0 < d1); // sanity checking
assert(d1 < d2); // sanity checking
// Since there's nothing in between, the midpoint has to be one or the other
T res;
res = std::midpoint(d0, d1);
assert(res == d0 || res == d1);
assert(d0 <= res);
assert(res <= d1);
res = std::midpoint(d1, d0);
assert(res == d0 || res == d1);
assert(d0 <= res);
assert(res <= d1);
#if defined(__PPC__) && __LONG_DOUBLE_128__ && !__LONG_DOUBLE_IEEE128__
// For 128 bit long double implemented as 2 doubles on PowerPC,
// nextafterl() of libm gives imprecise results which fails the
// midpoint() tests below. So skip the test for this case.
if constexpr (sizeof(T) != 16)
#endif
{
// Since there's nothing in between, the midpoint has to be one or the other
T res;
res = std::midpoint(d0, d1);
assert(res == d0 || res == d1);
assert(d0 <= res);
assert(res <= d1);
res = std::midpoint(d1, d0);
assert(res == d0 || res == d1);
assert(d0 <= res);
assert(res <= d1);
res = std::midpoint(d1, d2);
assert(res == d1 || res == d2);
assert(d1 <= res);
assert(res <= d2);
res = std::midpoint(d2, d1);
assert(res == d1 || res == d2);
assert(d1 <= res);
assert(res <= d2);
res = std::midpoint(d1, d2);
assert(res == d1 || res == d2);
assert(d1 <= res);
assert(res <= d2);
res = std::midpoint(d2, d1);
assert(res == d1 || res == d2);
assert(d1 <= res);
assert(res <= d2);
}
}