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@ -281,28 +281,35 @@ const uint64_t basic_data<T>::POWERS_OF_10_64[] = {
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// These are generated by support/compute-powers.py.
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template <typename T>
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const uint64_t basic_data<T>::POW10_SIGNIFICANDS[] = {
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0xfa8fd5a0081c0288, 0xbaaee17fa23ebf76, 0x8b16fb203055ac76, 0xcf42894a5dce35ea,
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0x9a6bb0aa55653b2d, 0xe61acf033d1a45df, 0xab70fe17c79ac6ca, 0xff77b1fcbebcdc4f,
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0xbe5691ef416bd60c, 0x8dd01fad907ffc3c, 0xd3515c2831559a83, 0x9d71ac8fada6c9b5,
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0xea9c227723ee8bcb, 0xaecc49914078536d, 0x823c12795db6ce57, 0xc21094364dfb5637,
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0x9096ea6f3848984f, 0xd77485cb25823ac7, 0xa086cfcd97bf97f4, 0xef340a98172aace5,
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0xb23867fb2a35b28e, 0x84c8d4dfd2c63f3b, 0xc5dd44271ad3cdba, 0x936b9fcebb25c996,
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0xdbac6c247d62a584, 0xa3ab66580d5fdaf6, 0xf3e2f893dec3f126, 0xb5b5ada8aaff80b8,
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0x87625f056c7c4a8b, 0xc9bcff6034c13053, 0x964e858c91ba2655, 0xdff9772470297ebd,
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0xa6dfbd9fb8e5b88f, 0xf8a95fcf88747d94, 0xb94470938fa89bcf, 0x8a08f0f8bf0f156b,
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0xcdb02555653131b6, 0x993fe2c6d07b7fac, 0xe45c10c42a2b3b06, 0xaa242499697392d3,
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0xfd87b5f28300ca0e, 0xbce5086492111aeb, 0x8cbccc096f5088cc, 0xd1b71758e219652c,
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0x9c40000000000000, 0xe8d4a51000000000, 0xad78ebc5ac620000, 0x813f3978f8940984,
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0xc097ce7bc90715b3, 0x8f7e32ce7bea5c70, 0xd5d238a4abe98068, 0x9f4f2726179a2245,
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0xed63a231d4c4fb27, 0xb0de65388cc8ada8, 0x83c7088e1aab65db, 0xc45d1df942711d9a,
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0x924d692ca61be758, 0xda01ee641a708dea, 0xa26da3999aef774a, 0xf209787bb47d6b85,
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0xb454e4a179dd1877, 0x865b86925b9bc5c2, 0xc83553c5c8965d3d, 0x952ab45cfa97a0b3,
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0xde469fbd99a05fe3, 0xa59bc234db398c25, 0xf6c69a72a3989f5c, 0xb7dcbf5354e9bece,
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0x88fcf317f22241e2, 0xcc20ce9bd35c78a5, 0x98165af37b2153df, 0xe2a0b5dc971f303a,
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0xa8d9d1535ce3b396, 0xfb9b7cd9a4a7443c, 0xbb764c4ca7a44410, 0x8bab8eefb6409c1a,
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0xd01fef10a657842c, 0x9b10a4e5e9913129, 0xe7109bfba19c0c9d, 0xac2820d9623bf429,
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0x80444b5e7aa7cf85, 0xbf21e44003acdd2d, 0x8e679c2f5e44ff8f, 0xd433179d9c8cb841,
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0x9e19db92b4e31ba9, 0xeb96bf6ebadf77d9, 0xaf87023b9bf0ee6b
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0xfa8fd5a0081c0288, 0xbaaee17fa23ebf76, 0x8b16fb203055ac76,
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0xcf42894a5dce35ea, 0x9a6bb0aa55653b2d, 0xe61acf033d1a45df,
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0xab70fe17c79ac6ca, 0xff77b1fcbebcdc4f, 0xbe5691ef416bd60c,
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0x8dd01fad907ffc3c, 0xd3515c2831559a83, 0x9d71ac8fada6c9b5,
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0xea9c227723ee8bcb, 0xaecc49914078536d, 0x823c12795db6ce57,
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0xc21094364dfb5637, 0x9096ea6f3848984f, 0xd77485cb25823ac7,
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0xa086cfcd97bf97f4, 0xef340a98172aace5, 0xb23867fb2a35b28e,
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0x84c8d4dfd2c63f3b, 0xc5dd44271ad3cdba, 0x936b9fcebb25c996,
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0xdbac6c247d62a584, 0xa3ab66580d5fdaf6, 0xf3e2f893dec3f126,
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0xb5b5ada8aaff80b8, 0x87625f056c7c4a8b, 0xc9bcff6034c13053,
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0x964e858c91ba2655, 0xdff9772470297ebd, 0xa6dfbd9fb8e5b88f,
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0xf8a95fcf88747d94, 0xb94470938fa89bcf, 0x8a08f0f8bf0f156b,
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0xcdb02555653131b6, 0x993fe2c6d07b7fac, 0xe45c10c42a2b3b06,
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0xaa242499697392d3, 0xfd87b5f28300ca0e, 0xbce5086492111aeb,
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0x8cbccc096f5088cc, 0xd1b71758e219652c, 0x9c40000000000000,
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0xe8d4a51000000000, 0xad78ebc5ac620000, 0x813f3978f8940984,
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0xc097ce7bc90715b3, 0x8f7e32ce7bea5c70, 0xd5d238a4abe98068,
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0x9f4f2726179a2245, 0xed63a231d4c4fb27, 0xb0de65388cc8ada8,
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0x83c7088e1aab65db, 0xc45d1df942711d9a, 0x924d692ca61be758,
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0xda01ee641a708dea, 0xa26da3999aef774a, 0xf209787bb47d6b85,
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0xb454e4a179dd1877, 0x865b86925b9bc5c2, 0xc83553c5c8965d3d,
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0x952ab45cfa97a0b3, 0xde469fbd99a05fe3, 0xa59bc234db398c25,
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0xf6c69a72a3989f5c, 0xb7dcbf5354e9bece, 0x88fcf317f22241e2,
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0xcc20ce9bd35c78a5, 0x98165af37b2153df, 0xe2a0b5dc971f303a,
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0xa8d9d1535ce3b396, 0xfb9b7cd9a4a7443c, 0xbb764c4ca7a44410,
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0x8bab8eefb6409c1a, 0xd01fef10a657842c, 0x9b10a4e5e9913129,
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0xe7109bfba19c0c9d, 0xac2820d9623bf429, 0x80444b5e7aa7cf85,
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0xbf21e44003acdd2d, 0x8e679c2f5e44ff8f, 0xd433179d9c8cb841,
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0x9e19db92b4e31ba9, 0xeb96bf6ebadf77d9, 0xaf87023b9bf0ee6b,
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};
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// Binary exponents of pow(10, k), for k = -348, -340, ..., 340, corresponding
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@ -339,7 +346,7 @@ FMT_FUNC fp get_cached_power(int min_exponent, int &pow10_exponent) {
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(min_exponent + fp::significand_size - 1) * one_over_log2_10));
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// Decimal exponent of the first (smallest) cached power of 10.
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const int first_dec_exp = -348;
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// Difference between two consecutive decimal exponents in cached powers of 10.
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// Difference between 2 consecutive decimal exponents in cached powers of 10.
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const int dec_exp_step = 8;
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index = (index - first_dec_exp - 1) / dec_exp_step + 1;
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pow10_exponent = first_dec_exp + index * dec_exp_step;
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@ -2933,7 +2933,7 @@ void basic_writer<Range>::write_double(T value, const format_specs &spec) {
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auto dec_pow = internal::get_cached_power(
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min_exp - (fp_value.e + internal::fp::significand_size), dec_exp);
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internal::fp product = fp_value * dec_pow;
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// Generate output.
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// Generate output using Grisu digit-gen-mix algorithm.
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internal::fp one(1ull << -product.e, product.e);
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uint64_t hi = product.f >> -one.e;
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uint64_t f = product.f & (one.f - 1);
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@ -39,7 +39,7 @@ for i, exp in enumerate(range(min_exponent, max_exponent + 1, step)):
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print('Significands:', end='')
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for i, fp in enumerate(powers):
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if i % 4 == 0:
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if i % 3 == 0:
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print(end='\n ')
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print(' {:0<#16x}'.format(fp.f, ), end=',')
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