diff options
author | Thiago Macieira <thiago.macieira@intel.com> | 2013-08-06 19:32:37 -0700 |
---|---|---|
committer | The Qt Project <gerrit-noreply@qt-project.org> | 2014-05-27 06:26:57 +0200 |
commit | 689e8055f5c4f3bbdbb9a90ac0405b5295f81374 (patch) | |
tree | 619de88b9d816d5d9d8b7b0fc420bd286f81627d /configure | |
parent | cb09e1e88944e1ab9b0d00a95cdc71bdab69ad58 (diff) |
Add support for single-file multi-target intrinsics in Qt
GCC 4.9 now allows us to #include any and all intrinsics headers, not
just the one for which we're compiling code, a behavior that ICC and
MSVC have had for some time. With that, we're able to have the functions
for different targets in the same source file. See the GCC manual:
http://gcc.gnu.org/onlinedocs/gcc/Function-Multiversioning.html
This functionality is notified by the QT_COMPILER_SUPPORTS_HERE(XXX)
macro, which indicates that all the intrinsics from
QT_COMPILER_SUPPORTS_xxx are available and enabled. To complement, a
QT_COMPILER_SUPPORTS(XXX) macro is also added.
Unlike ICC and MSVC, GCC requires a special function attribute, which
will also cause code optimization. That's the QT_FUNCTION_TARGET macro.
Note: because of the absence of the target attribute, ICC and MSVC will
not generate instructions with the VEX prefix unless they only exist
with the VEX prefix or if -mavx / -arch:AVX are enabled.
Change-Id: I0c1880c20324bd8e0fc68a863e36d1fa7755dff0
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@digia.com>
Diffstat (limited to 'configure')
-rwxr-xr-x | configure | 2 |
1 files changed, 1 insertions, 1 deletions
@@ -6035,7 +6035,7 @@ for SUBARCH in SSE2 SSE3 SSSE3 SSE4_1 SSE4_2 AVX AVX2 \ eval "VAL=\$CFG_$SUBARCH" case "$VAL" in yes) - echo "#define QT_COMPILER_SUPPORTS_$SUBARCH" \ + echo "#define QT_COMPILER_SUPPORTS_$SUBARCH 1" \ >>"$outpath/src/corelib/global/qconfig.h.new" ;; esac |