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From: Yongseok Koh <yskoh@mellanox.com>
To: Thomas Monjalon <thomas@monjalon.net>, "bruce.richardson@intel.com"
<bruce.richardson@intel.com>, "ferruh.yigit@intel.com"
<ferruh.yigit@intel.com>
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"anatoly.burakov@intel.com" <anatoly.burakov@intel.com>, Yongseok Koh
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Thread-Topic: [PATCH v2] build: disable compiler AVX512F support
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Date: Fri, 2 Nov 2018 21:04:05 +0000
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Subject: [dpdk-dev] [PATCH v2] build: disable compiler AVX512F support
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This is a workaround to prevent a crash, which might be caused by
optimization of newer gcc (7.3.0) on Intel Skylake.
Bugzilla ID: 97
Cc: stable@dpdk.org
Signed-off-by: Yongseok Koh <yskoh@mellanox.com>
---
v2:
* disable the flag only in case of gcc
config/x86/meson.build | 5 +++++
mk/rte.cpuflags.mk | 7 +++++++
2 files changed, 12 insertions(+)
diff --git a/config/x86/meson.build b/config/x86/meson.build
index 33efb5e547..8ddca0ea9f 100644
--- a/config/x86/meson.build
+++ b/config/x86/meson.build
@@ -47,6 +47,11 @@ endif
if cc.get_define('__AVX512F__', args: march_opt) !=3D ''
dpdk_conf.set('RTE_MACHINE_CPUFLAG_AVX512F', 1)
compile_time_cpuflags +=3D ['RTE_CPUFLAG_AVX512F']
+else
+# disable AVX512F support of gcc as a workaround for Bug 97
+ if cc.get_id() =3D=3D 'gcc' and cc.has_argument('-mavx512f')
+ machine_args +=3D '-mno-avx512f'
+ endif
endif
=20
dpdk_conf.set('RTE_CACHE_LINE_SIZE', 64)
diff --git a/mk/rte.cpuflags.mk b/mk/rte.cpuflags.mk
index 43ed84155b..a8c26fb011 100644
--- a/mk/rte.cpuflags.mk
+++ b/mk/rte.cpuflags.mk
@@ -68,6 +68,13 @@ endif
ifneq ($(filter $(AUTO_CPUFLAGS),__AVX512F__),)
ifeq ($(CONFIG_RTE_ENABLE_AVX512),y)
CPUFLAGS +=3D AVX512F
+else
+# disable AVX512F support of gcc as a workaround for Bug 97
+ifeq ($(CONFIG_RTE_TOOLCHAIN_GCC),y)
+ ifeq ($(shell $(CC) --target-help | grep -q mavx512f && echo 1), 1)
+ MACHINE_CFLAGS +=3D -mno-avx512f
+ endif
+endif
endif
endif
=20
--=20
2.11.0