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Commitabd9ca3

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Make assorted performance improvements in snprintf.c.
In combination, these changes make our version of snprintf as fastor faster than most platforms' native snprintf, except for casesinvolving floating-point conversion (which we still delegate tothe native sprintf). The speed penalty for a float conversionis down to around 10% though, much better than before.Notable changes:* Rather than always parsing the format twice to see if it containsinstances of %n$, do the extra scan only if we actually find a $.This obviously wins for non-localized formats, and even when thereis use of %n$, we can avoid scanning text before the first % twice.* Use strchrnul() if available to find the next %, and emit theliteral text between % escapes as strings rather than char-by-char.* Create a bespoke function (dopr_outchmulti) for the common caseof emitting N copies of the same character, in place of writingloops around dopr_outch.* Simplify construction of the format string for invocations of sprintffor floats.* Const-ify some internal functions, and avoid unnecessary use ofpass-by-reference arguments.Patch by me, reviewed by Andres FreundDiscussion:https://postgr.es/m/11787.1534530779@sss.pgh.pa.us
1 parent9bc9f72 commitabd9ca3

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5 files changed

+432
-273
lines changed

5 files changed

+432
-273
lines changed

‎configure‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -15100,7 +15100,7 @@ fi
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LIBS_including_readline="$LIBS"
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LIBS=`echo "$LIBS" | sed -e 's/-ledit//g' -e 's/-lreadline//g'`
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15103-
for ac_func in cbrt clock_gettime fdatasync getifaddrs getpeerucred getrlimit mbstowcs_l memmove poll posix_fallocate ppoll pstat pthread_is_threaded_np readlink setproctitle setproctitle_fast setsid shm_open symlink sync_file_range utime utimes wcstombs_l
15103+
for ac_func in cbrt clock_gettime fdatasync getifaddrs getpeerucred getrlimit mbstowcs_l memmove poll posix_fallocate ppoll pstat pthread_is_threaded_np readlink setproctitle setproctitle_fast setsid shm_openstrchrnulsymlink sync_file_range utime utimes wcstombs_l
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do :
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as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
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ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"

‎configure.in‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1571,7 +1571,7 @@ PGAC_FUNC_WCSTOMBS_L
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LIBS_including_readline="$LIBS"
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LIBS=`echo "$LIBS" | sed -e 's/-ledit//g' -e 's/-lreadline//g'`
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1574-
AC_CHECK_FUNCS([cbrt clock_gettime fdatasync getifaddrs getpeerucred getrlimit mbstowcs_l memmove poll posix_fallocate ppoll pstat pthread_is_threaded_np readlink setproctitle setproctitle_fast setsid shm_open symlink sync_file_range utime utimes wcstombs_l])
1574+
AC_CHECK_FUNCS([cbrt clock_gettime fdatasync getifaddrs getpeerucred getrlimit mbstowcs_l memmove poll posix_fallocate ppoll pstat pthread_is_threaded_np readlink setproctitle setproctitle_fast setsid shm_openstrchrnulsymlink sync_file_range utime utimes wcstombs_l])
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AC_REPLACE_FUNCS(fseeko)
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case $host_os in

‎src/include/pg_config.h.in‎

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -523,6 +523,9 @@
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/* Define to 1 if you have the <stdlib.h> header file. */
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#undef HAVE_STDLIB_H
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/* Define to 1 if you have the `strchrnul' function. */
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#undef HAVE_STRCHRNUL
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/* Define to 1 if you have the `strerror_r' function. */
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#undef HAVE_STRERROR_R
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‎src/include/pg_config.h.win32‎

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Original file line numberDiff line numberDiff line change
@@ -394,6 +394,9 @@
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/* Define to 1 if you have the <stdlib.h> header file. */
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#define HAVE_STDLIB_H 1
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/* Define to 1 if you have the `strchrnul' function. */
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/* #undef HAVE_STRCHRNUL */
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/* Define to 1 if you have the `strerror_r' function. */
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/* #undef HAVE_STRERROR_R */
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