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serfloat: do not test encode(bits)=bits anymore

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This commit is contained in:
Pieter Wuille 2024-01-05 14:26:52 -05:00
parent bdddf364c9
commit b45f1f5658
1 changed files with 2 additions and 5 deletions
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7
src/test/serfloat_tests.cpp
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@ -47,7 +47,6 @@ BOOST_AUTO_TEST_CASE(double_serfloat_tests) {
BOOST_CHECK_EQUAL(TestDouble(4.0), 0x4010000000000000ULL);
BOOST_CHECK_EQUAL(TestDouble(785.066650390625), 0x4088888880000000ULL);
// Roundtrip test on IEC559-compatible systems
if (std::numeric_limits<double>::is_iec559) {
BOOST_CHECK_EQUAL(sizeof(double), 8U);
BOOST_CHECK_EQUAL(sizeof(uint64_t), 8U);
@ -64,8 +63,7 @@ BOOST_AUTO_TEST_CASE(double_serfloat_tests) {
TestDouble(-std::numeric_limits<double>::signaling_NaN());
TestDouble(std::numeric_limits<double>::denorm_min());
TestDouble(-std::numeric_limits<double>::denorm_min());
// Test exact encoding: on currently supported platforms, EncodeDouble
// should produce exactly the same as the in-memory representation for non-NaN.
// On IEC559-compatible systems, construct doubles to test from the encoding.
for (int j = 0; j < 1000; ++j) {
// Iterate over 9 specific bits exhaustively; the others are chosen randomly.
// These specific bits are the sign bit, and the 2 top and bottom bits of
@ -92,8 +90,7 @@ BOOST_AUTO_TEST_CASE(double_serfloat_tests) {
if (x & 256) v |= (uint64_t{1} << 63);
double f;
memcpy(&f, &v, 8);
uint64_t v2 = TestDouble(f);
if (!std::isnan(f)) BOOST_CHECK_EQUAL(v, v2);
TestDouble(f);
}
}
}