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| author | Andrew Gierth <rhodiumtoad@postgresql.org> | 2020-02-01 21:57:14 +0000 |
|---|---|---|
| committer | Andrew Gierth <rhodiumtoad@postgresql.org> | 2020-02-01 21:57:14 +0000 |
| commit | 1fd687a035558238c0e3cab09fc22dc61a088869 (patch) | |
| tree | a1bb4aeffc21f7fc0e96f7d86d0b80c5c3b0ab8c /src/include/utils/builtins.h | |
| parent | 7bae0ad9fcb76b28410571dc71edfdc3175c4a02 (diff) | |
| download | postgresql-1fd687a035558238c0e3cab09fc22dc61a088869.tar.gz postgresql-1fd687a035558238c0e3cab09fc22dc61a088869.zip | |
Optimizations for integer to decimal output.
Using a lookup table of digit pairs reduces the number of divisions
needed, and calculating the length upfront saves some work; these
ideas are taken from the code previously committed for floats.
David Fetter, reviewed by Kyotaro Horiguchi, Tels, and me.
Discussion: https://postgr.es/m/20190924052620.GP31596%40fetter.org
Diffstat (limited to 'src/include/utils/builtins.h')
| -rw-r--r-- | src/include/utils/builtins.h | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/src/include/utils/builtins.h b/src/include/utils/builtins.h index a241af4bdf9..e2016a8bc2d 100644 --- a/src/include/utils/builtins.h +++ b/src/include/utils/builtins.h @@ -18,6 +18,8 @@ #include "nodes/nodes.h" #include "utils/fmgrprotos.h" +/* Sign + the most decimal digits an 8-byte number could have */ +#define MAXINT8LEN 20 /* bool.c */ extern bool parse_bool(const char *value, bool *result); @@ -46,10 +48,12 @@ extern int32 pg_atoi(const char *s, int size, int c); extern int16 pg_strtoint16(const char *s); extern int32 pg_strtoint32(const char *s); extern void pg_itoa(int16 i, char *a); +int pg_ultoa_n(uint32 l, char *a); +int pg_ulltoa_n(uint64 l, char *a); extern void pg_ltoa(int32 l, char *a); extern void pg_lltoa(int64 ll, char *a); -extern char *pg_ltostr_zeropad(char *str, int32 value, int32 minwidth); -extern char *pg_ltostr(char *str, int32 value); +extern char *pg_ultostr_zeropad(char *str, uint32 value, int32 minwidth); +extern char *pg_ultostr(char *str, uint32 value); extern uint64 pg_strtouint64(const char *str, char **endptr, int base); /* oid.c */ |