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| author | Liam Merwick <Liam.Merwick@oracle.com> | 2018-10-19 21:38:59 +0100 |
|---|---|---|
| committer | Thomas Huth <thuth@redhat.com> | 2018-10-24 07:39:10 +0100 |
| commit | 86583a07c4a7d55b04db5942a70d176f5299144a (patch) | |
| tree | 5693a0c5354822b29c82f7573eba34c6834e5faf | |
| parent | ba27877618abcc4906db9a9168dbbb3104c1a3d0 (diff) | |
| download | qemu-86583a07c4a7d55b04db5942a70d176f5299144a.zip qemu-86583a07c4a7d55b04db5942a70d176f5299144a.tar.gz qemu-86583a07c4a7d55b04db5942a70d176f5299144a.tar.bz2 | |
configure: Provide option to explicitly disable AVX2
The configure script detects if the compiler has AVX2 support and
automatically sets avx2_opt="yes" which in turn defines CONFIG_AVX2_OPT.
There is no way of explicitly overriding this setting so this commit adds
two command-line options: --enable-avx2 and --disable-avx2.
The default behaviour, when no option is specified, is to maintain the
current behaviour and enable AVX2 if the compiler supports it.
Signed-off-by: Liam Merwick <Liam.Merwick@oracle.com>
Reviewed-by: Darren Kenny <Darren.Kenny@oracle.com>
Reviewed-by: Mark Kanda <Mark.Kanda@oracle.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
| -rwxr-xr-x | configure | 11 |
1 files changed, 9 insertions, 2 deletions
@@ -428,7 +428,7 @@ usb_redir="" opengl="" opengl_dmabuf="no" cpuid_h="no" -avx2_opt="no" +avx2_opt="" zlib="yes" capstone="" lzo="" @@ -1329,6 +1329,10 @@ for opt do ;; --disable-glusterfs) glusterfs="no" ;; + --disable-avx2) avx2_opt="no" + ;; + --enable-avx2) avx2_opt="yes" + ;; --enable-glusterfs) glusterfs="yes" ;; --disable-virtio-blk-data-plane|--enable-virtio-blk-data-plane) @@ -1703,6 +1707,7 @@ disabled with --disable-FEATURE, default is enabled if available: libxml2 for Parallels image format tcmalloc tcmalloc support jemalloc jemalloc support + avx2 AVX2 optimization support replication replication support vhost-vsock virtio sockets device support opengl opengl support @@ -5032,7 +5037,7 @@ fi # There is no point enabling this if cpuid.h is not usable, # since we won't be able to select the new routines. -if test $cpuid_h = yes; then +if test "$cpuid_h" = "yes" -a "$avx2_opt" != "no"; then cat > $TMPC << EOF #pragma GCC push_options #pragma GCC target("avx2") @@ -5046,6 +5051,8 @@ int main(int argc, char *argv[]) { return bar(argv[0]); } EOF if compile_object "" ; then avx2_opt="yes" + else + avx2_opt="no" fi fi |