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Fix the floating point version of midpoint. It wasn't constexpr, among other things. Add more tests. As a drive-by, the LCD implementation had a class named '__abs' which did a 'absolute value to a common-type' conversion. Rename that to be '__ct_abs'.

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@363714 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Marshall Clow
2019-06-18 18:13:54 +00:00
parent f8f62ac93c
commit 389b4e6d63
2 changed files with 34 additions and 16 deletions
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21
test/std/numerics/numeric.ops/numeric.ops.midpoint/midpoint.float.pass.cpp
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@@ -43,11 +43,11 @@ void fp_test()
constexpr T minV = std::numeric_limits<T>::min();
// Things that can be compared exactly
assert((std::midpoint(T(0), T(0)) == T(0)));
assert((std::midpoint(T(2), T(4)) == T(3)));
assert((std::midpoint(T(4), T(2)) == T(3)));
assert((std::midpoint(T(3), T(4)) == T(3.5)));
assert((std::midpoint(T(0), T(0.4)) == T(0.2)));
static_assert((std::midpoint(T(0), T(0)) == T(0)), "");
static_assert((std::midpoint(T(2), T(4)) == T(3)), "");
static_assert((std::midpoint(T(4), T(2)) == T(3)), "");
static_assert((std::midpoint(T(3), T(4)) == T(3.5)), "");
static_assert((std::midpoint(T(0), T(0.4)) == T(0.2)), "");
// Things that can't be compared exactly
constexpr T pct = fp_error_pct<T>();
@@ -70,6 +70,17 @@ void fp_test()
assert((fptest_close_pct(std::midpoint(T(0), minV), minV/2, pct)));
assert((fptest_close_pct(std::midpoint(maxV, maxV), maxV, pct)));
assert((fptest_close_pct(std::midpoint(minV, minV), minV, pct)));
assert((fptest_close_pct(std::midpoint(maxV, minV), maxV/2, pct)));
assert((fptest_close_pct(std::midpoint(minV, maxV), maxV/2, pct)));
// Near the min and the max
assert((fptest_close_pct(std::midpoint(maxV*T(0.75), maxV*T(0.50)), maxV*T(0.625), pct)));
assert((fptest_close_pct(std::midpoint(maxV*T(0.50), maxV*T(0.75)), maxV*T(0.625), pct)));
assert((fptest_close_pct(std::midpoint(minV*T(2), minV*T(8)), minV*T(5), pct)));
// Big numbers of different signs
assert((fptest_close_pct(std::midpoint(maxV*T( 0.75), maxV*T(-0.5)), maxV*T( 0.125), pct)));
assert((fptest_close_pct(std::midpoint(maxV*T(-0.75), maxV*T( 0.5)), maxV*T(-0.125), pct)));
// Denormalized values
// TODO