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| author | Alan Coopersmith <alan.coopersmith@oracle.com> | 2020-09-28 16:16:07 -0700 |
|---|---|---|
| committer | Alan Coopersmith <alan.coopersmith@oracle.com> | 2020-09-28 16:16:07 -0700 |
| commit | caa71668af7fd3ebdd56353c8f0ab90824773969 (patch) | |
| tree | 7e580e287802860f4c76df0b73ec1f4a25b1398d /configure.ac | |
| parent | 1a9269a95c353e3de9f4d33bab9f1363d84e79db (diff) | |
| download | xorg-lib-libX11-caa71668af7fd3ebdd56353c8f0ab90824773969.tar.gz | |
Use __builtin_popcountl if available to replace Ones() in GetImage.c
If the compiler knows of a better algorithm for counting the number of
bits set in a word for the target CPU, let it use that, instead of the
classic algorithm optimized for PDP-6.
Based on libXext commit 490a25e6f8a4d2482af4364c700b68ad11a4d10b
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index b7602026..7a8ad520 100644 --- a/configure.ac +++ b/configure.ac @@ -152,6 +152,7 @@ AC_MSG_RESULT($XLIB_LOADABLE_XCURSOR) AC_CHECK_HEADERS([sys/filio.h sys/select.h sys/ioctl.h sys/socket.h]) # Checks for typedefs, structures, and compiler characteristics. +AX_GCC_BUILTIN([__builtin_popcountl]) # Checks for library functions. AC_CHECK_FUNCS([strtol seteuid]) |