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maths: use bit patterns for tests float values

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this makes some of the tests more robust in the face of (potentially
stanard breaking) optimisations.
This commit is contained in:
Danny Robson 2017-07-25 17:08:52 +10:00
parent fcc78eb103
commit b18feb8bc4
1 changed files with 8 additions and 4 deletions
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12
test/maths.cpp
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@ -161,13 +161,17 @@ main (void)
tap.expect_eq (util::pow2 (4u), 16u, "pow2"); tap.expect_eq (util::pow2 (4u), 16u, "pow2");
static const double POS_ZERO = 1.0 / numeric_limits<double>::infinity (); static const float POS_ZERO = 1.f / numeric_limits<float>::infinity ();
static const double NEG_ZERO = -1.0 / numeric_limits<double>::infinity ();
union {
uint32_t neg_zero_bits = 0x80000000;
float NEG_ZERO;
};
tap.expect_eq (util::sign (-1), -1, "sign(-1)"); tap.expect_eq (util::sign (-1), -1, "sign(-1)");
tap.expect_eq (util::sign ( 1), 1, "sign( 1)"); tap.expect_eq (util::sign ( 1), 1, "sign( 1)");
tap.expect_eq (util::sign (POS_ZERO), 1., "sign (POS_ZERO)"); tap.expect_eq (util::sign (POS_ZERO), 1.f, "sign (POS_ZERO)");
tap.expect_eq (util::sign (NEG_ZERO), -1., "sign (NEG_ZERO)"); tap.expect_eq (util::sign (NEG_ZERO), -1.f, "sign (NEG_ZERO)");
tap.expect_eq (util::sign ( numeric_limits<double>::infinity ()), 1., "sign +inf"); tap.expect_eq (util::sign ( numeric_limits<double>::infinity ()), 1., "sign +inf");
tap.expect_eq (util::sign (-numeric_limits<double>::infinity ()), -1., "sign -inf"); tap.expect_eq (util::sign (-numeric_limits<double>::infinity ()), -1., "sign -inf");