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Merge pull request #27155 from kitaisreal/parse-int-unsafe-updated

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Updated readIntTextUnsafe
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Maksim Kita 2021-08-05 11:37:22 +03:00 committed by GitHub
commit 2ca6b2cfc0
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1 changed files with 3 additions and 7 deletions
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10
src/IO/ReadHelpers.h
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@ -403,7 +403,6 @@ bool tryReadIntText(T & x, ReadBuffer & buf) // -V1071
* Differs in following:
* - for numbers starting with zero, parsed only zero;
* - symbol '+' before number is not supported;
* - symbols :;<=>? are parsed as some numbers.
*/
template <typename T, bool throw_on_error = true>
void readIntTextUnsafe(T & x, ReadBuffer & buf)
@ -437,15 +436,12 @@ void readIntTextUnsafe(T & x, ReadBuffer & buf)
while (!buf.eof())
{
/// This check is suddenly faster than
/// unsigned char c = *buf.position() - '0';
/// if (c < 10)
/// for unknown reason on Xeon E5645.
unsigned char value = *buf.position() - '0';
if ((*buf.position() & 0xF0) == 0x30) /// It makes sense to have this condition inside loop.
if (value < 10)
{
res *= 10;
res += *buf.position() & 0x0F;
res += value;
++buf.position();
}
else