a621198a03
The Ryu algorithm is very fast with its table, but that table grows too large for long doubles. This patch adds a method of calculating the digits of long doubles using just wide integers and fast modulo operations. This results in significant performance improvements vs the previous int calc mode, while taking up a similar amound of peak memory. It will be slow in some %e/%g cases, but reasonable fast for %f with no loss of accuracy.
31 lines
1023 B
JSON
31 lines
1023 B
JSON
{
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"printf": {
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"LIBC_CONF_PRINTF_DISABLE_FLOAT": {
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"value": false,
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"doc": "Disable printing floating point values in printf and friends."
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},
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"LIBC_CONF_PRINTF_DISABLE_INDEX_MODE": {
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"value": false,
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"doc": "Disable index mode in the printf format string."
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},
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"LIBC_CONF_PRINTF_DISABLE_WRITE_INT": {
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"value": false,
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"doc": "Disable handling of %n in printf format string."
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},
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"LIBC_CONF_PRINTF_FLOAT_TO_STR_USE_MEGA_LONG_DOUBLE_TABLE": {
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"value": false,
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"doc": "Use large table for better printf long double performance."
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}
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},
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"string": {
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"LIBC_CONF_STRING_UNSAFE_WIDE_READ": {
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"value": false,
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"doc": "Read more than a byte at a time to perform byte-string operations like strlen."
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},
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"LIBC_CONF_MEMSET_X86_USE_SOFTWARE_PREFETCHING": {
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"value": false,
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"doc": "Inserts prefetch for write instructions (PREFETCHW) for memset on x86 to recover performance when hardware prefetcher is disabled."
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}
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}
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}
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