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| author | William Tu <u9012063@gmail.com> | 2022-01-26 19:45:26 -0800 |
|---|---|---|
| committer | Ian Stokes <ian.stokes@intel.com> | 2022-02-02 14:36:55 +0000 |
| commit | 33027afd229cdc3c7066105b20bbb791cb3341f6 (patch) | |
| tree | 4425e5b0c55012ab84ef90f57628f00dcda28849 /acinclude.m4 | |
| parent | 0bca7fa1a3dd86bc75c7daf716b425289927feb7 (diff) | |
| download | openvswitch-33027afd229cdc3c7066105b20bbb791cb3341f6.tar.gz | |
acinclude: Detect avx512 vpopcntdq compiler support.
Ubuntu Xenial 16.04 is using GCC 5.4 and it does not support
target "-mavx512vpopcntdq" and cuases error
lib/dpif-netdev-lookup-avx512-gather.c:356:47:
error: attribute(target("avx512vpopcntdq")) is unknown
GCC 7+ supports vpopcntdq:
https://gcc.gnu.org/gcc-7/changes.html
The patch detects vpopcntdq and disables AVX512 when not found.
Fixes: 1e314891340d ("dpcls-avx512: Enable avx512 vector popcount instruction.")
Reported-by: Greg Rose <gvrose8192@gmail.com>
Signed-off-by: William Tu <u9012063@gmail.com>
Tested-by: Greg Rose <gvrose8192@gmail.com>
Reviewed-by: Greg Rose <gvrose8192@gmail.com>
Acked-by: Cian Ferriter <cian.ferriter@intel.com>
Signed-off-by: Ian Stokes <ian.stokes@intel.com>
Diffstat (limited to 'acinclude.m4')
| -rw-r--r-- | acinclude.m4 | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/acinclude.m4 b/acinclude.m4 index 5c971e98c..0c360fd1e 100644 --- a/acinclude.m4 +++ b/acinclude.m4 @@ -77,7 +77,7 @@ dnl Checks if compiler and binutils supports AVX512. AC_DEFUN([OVS_CHECK_AVX512], [ OVS_CHECK_BINUTILS_AVX512 OVS_CHECK_CC_OPTION( - [-mavx512f], [ovs_have_cc_mavx512f=yes], [ovs_have_cc_mavx512f=no]) + [-mavx512f -mavx512vpopcntdq], [ovs_have_cc_mavx512f=yes], [ovs_have_cc_mavx512f=no]) AM_CONDITIONAL([HAVE_AVX512F], [test $ovs_have_cc_mavx512f = yes]) if test "$ovs_have_cc_mavx512f" = yes; then AC_DEFINE([HAVE_AVX512F], [1], |