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Add charconv test cases (#835) 

* Fix GH-331 "<charconv>: Test plain shortest's large integer fallback".

* Add rounding test cases.
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Stephan T. Lavavej 2020-05-18 17:36:13 -07:00 коммит произвёл GitHub
Родитель 809a908e50
Коммит 4e30363272
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23
tests/std/tests/P0067R5_charconv/double_general_precision_to_chars_test_cases.hpp
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@ -5025,4 +5025,27 @@ inline constexpr DoublePrecisionToCharsTestCase double_general_precision_to_char
"17976931348623157081452742373170435679807056752584499659891747680315726078002853876058955863276687817154045895"
"35143824642343213268894641827684675467035375169860499105765512820762454900903893289440758685084551339423045832"
"36903222948165808559332123348274797826204144723168738177180919299881250404026184124858368"},
// The UCRT had trouble with rounding this value. charconv was never affected, but let's test it anyways.
{0x1.88e2d605edc3dp+345, chars_format::general, 105,
"109995565999999994887854821710219658911365648587951921896774663603198787416706536331386569598149846892544"},
{0x1.88e2d605edc3dp+345, chars_format::general, 19, "1.099955659999999949e+104"},
{0x1.88e2d605edc3dp+345, chars_format::general, 18, "1.09995565999999995e+104"},
{0x1.88e2d605edc3dp+345, chars_format::general, 17, "1.0999556599999999e+104"},
{0x1.88e2d605edc3dp+345, chars_format::general, 16, "1.09995566e+104"},
{0x1.88e2d605edc3dp+345, chars_format::general, 15, "1.09995566e+104"},
{0x1.88e2d605edc3dp+345, chars_format::general, 14, "1.09995566e+104"},
{0x1.88e2d605edc3dp+345, chars_format::general, 13, "1.09995566e+104"},
{0x1.88e2d605edc3dp+345, chars_format::general, 12, "1.09995566e+104"},
{0x1.88e2d605edc3dp+345, chars_format::general, 11, "1.09995566e+104"},
{0x1.88e2d605edc3dp+345, chars_format::general, 10, "1.09995566e+104"},
{0x1.88e2d605edc3dp+345, chars_format::general, 9, "1.09995566e+104"},
{0x1.88e2d605edc3dp+345, chars_format::general, 8, "1.0999557e+104"},
{0x1.88e2d605edc3dp+345, chars_format::general, 7, "1.099956e+104"},
{0x1.88e2d605edc3dp+345, chars_format::general, 6, "1.09996e+104"},
{0x1.88e2d605edc3dp+345, chars_format::general, 5, "1.1e+104"},
{0x1.88e2d605edc3dp+345, chars_format::general, 4, "1.1e+104"},
{0x1.88e2d605edc3dp+345, chars_format::general, 3, "1.1e+104"},
{0x1.88e2d605edc3dp+345, chars_format::general, 2, "1.1e+104"},
{0x1.88e2d605edc3dp+345, chars_format::general, 1, "1e+104"},
};

24
tests/std/tests/P0067R5_charconv/double_scientific_precision_to_chars_test_cases_1.hpp
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@ -287,4 +287,28 @@ inline constexpr DoublePrecisionToCharsTestCase double_scientific_precision_to_c
{1e-63, chars_format::scientific, 1, "1.0e-63"},
{1e+83, chars_format::scientific, 0, "1e+83"},
{1e+83, chars_format::scientific, 1, "1.0e+83"},
// The UCRT had trouble with rounding this value. charconv was never affected, but let's test it anyways.
{0x1.88e2d605edc3dp+345, chars_format::scientific, 104,
"1.09995565999999994887854821710219658911365648587951921896774663603198787416706536331386569598149846892544e+"
"104"},
{0x1.88e2d605edc3dp+345, chars_format::scientific, 18, "1.099955659999999949e+104"},
{0x1.88e2d605edc3dp+345, chars_format::scientific, 17, "1.09995565999999995e+104"},
{0x1.88e2d605edc3dp+345, chars_format::scientific, 16, "1.0999556599999999e+104"},
{0x1.88e2d605edc3dp+345, chars_format::scientific, 15, "1.099955660000000e+104"},
{0x1.88e2d605edc3dp+345, chars_format::scientific, 14, "1.09995566000000e+104"},
{0x1.88e2d605edc3dp+345, chars_format::scientific, 13, "1.0999556600000e+104"},
{0x1.88e2d605edc3dp+345, chars_format::scientific, 12, "1.099955660000e+104"},
{0x1.88e2d605edc3dp+345, chars_format::scientific, 11, "1.09995566000e+104"},
{0x1.88e2d605edc3dp+345, chars_format::scientific, 10, "1.0999556600e+104"},
{0x1.88e2d605edc3dp+345, chars_format::scientific, 9, "1.099955660e+104"},
{0x1.88e2d605edc3dp+345, chars_format::scientific, 8, "1.09995566e+104"},
{0x1.88e2d605edc3dp+345, chars_format::scientific, 7, "1.0999557e+104"},
{0x1.88e2d605edc3dp+345, chars_format::scientific, 6, "1.099956e+104"},
{0x1.88e2d605edc3dp+345, chars_format::scientific, 5, "1.09996e+104"},
{0x1.88e2d605edc3dp+345, chars_format::scientific, 4, "1.1000e+104"},
{0x1.88e2d605edc3dp+345, chars_format::scientific, 3, "1.100e+104"},
{0x1.88e2d605edc3dp+345, chars_format::scientific, 2, "1.10e+104"},
{0x1.88e2d605edc3dp+345, chars_format::scientific, 1, "1.1e+104"},
{0x1.88e2d605edc3dp+345, chars_format::scientific, 0, "1e+104"},
};

8
tests/std/tests/P0067R5_charconv/double_to_chars_test_cases.hpp
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@ -2787,6 +2787,14 @@ inline constexpr DoubleToCharsTestCase double_to_chars_test_cases[] = {
{1.234e9, chars_format{}, "1.234e+09"},
{1.234e10, chars_format{}, "1.234e+10"},
// GH-331 "<charconv>: Test plain shortest's large integer fallback"
// The exactly-representable integer 123456789012345683968 is 21 digits, but scientific shortest needs 22
// characters. Therefore, the plain overload must select fixed notation. Because this 21-digit number exceeds the
// 17-digit round-trip limit, we can't use Ryu - we need to activate the large integer fallback (Ryu Printf for
// double).
{123456789012345683968.0, chars_format::scientific, "1.2345678901234568e+20"},
{123456789012345683968.0, chars_format{}, "123456789012345683968"},
// Exact value is 1.9156918820264798304697...e-56, incorrectly rounded by dtoa_milo() (Grisu2).
{0x1.e0ffed391517ep-186, chars_format::scientific, "1.9156918820264798e-56"},

8
tests/std/tests/P0067R5_charconv/float_to_chars_test_cases.hpp
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@ -497,6 +497,14 @@ inline constexpr FloatToCharsTestCase float_to_chars_test_cases[] = {
{1.234e9f, chars_format{}, "1.234e+09"},
{1.234e10f, chars_format{}, "1.234e+10"},
// GH-331 "<charconv>: Test plain shortest's large integer fallback"
// The exactly-representable integer 123456790528 is 12 digits, but scientific shortest needs 13 characters.
// Therefore, the plain overload must select fixed notation. Because this 12-digit number exceeds the 9-digit
// round-trip limit, we can't use Ryu - we need to activate the large integer fallback (currently, long division for
// float).
{123456790528.0f, chars_format::scientific, "1.2345679e+11"},
{123456790528.0f, chars_format{}, "123456790528"},
// Test hexfloat corner cases.
{0x1.728p+0f, chars_format::hex, "1.728p+0"}, // instead of "2.e5p-1"
{0x0.000002p-126f, chars_format::hex, "0.000002p-126"}, // instead of "1p-149", min subnormal