Commit 86583a07 authored by Liam Merwick's avatar Liam Merwick Committed by Thomas Huth
Browse files

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: default avatarLiam Merwick <Liam.Merwick@oracle.com>
Reviewed-by: default avatarDarren Kenny <Darren.Kenny@oracle.com>
Reviewed-by: default avatarMark Kanda <Mark.Kanda@oracle.com>
Signed-off-by: default avatarThomas Huth <thuth@redhat.com>
parent ba278776

configure

+9 −2
Original line number Diff line number Diff line
@@ -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