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build: support arch-specific compiling for Neoverse N1

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Enable arch-specific compiling and dynamic optimal function selection
for Arm Neoverse-N1.

Support for -march=armv8.2-a+crc+crypto -mtune=neoverse-n1 for
Neoverse-N1 is added starting from gcc-9.2.0

                    without change  with change improvement
[L2 - 1x flows]     11.00 Mpps      11.46 Mpps  4%
[L2 - 10Kx flows]   6.83 Mpps       7.17 Mpps   5%
[L3 - 1x flows]     10.39 Mpps      10.78 Mpps  3.7%
[L3 - 10Kx flows]   6.67 Mpps       7.19 Mpps   7.8%

Type: feature

Change-Id: I5d24d17820b3dd6909b913202e8c31fc7d48650f
Signed-off-by: Lijian Zhang <Lijian.Zhang@arm.com>
Reviewed-by: Jieqiang Wang <Jieqiang.Wang@arm.com>
Reviewed-by: Govindarajan Mohandoss <Govindarajan.Mohandoss@arm.com>
This commit is contained in:
Lijian.Zhang
2020-02-18 19:58:19 +08:00
committed by Damjan Marion
parent e09912001f
commit 690ce8672c
2 changed files with 15 additions and 0 deletions
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4
src/cmake/cpu.cmake
View File

@ -107,6 +107,10 @@ elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64.*|AARCH64.*)")
if(compiler_flag_march_cortexa72)
list(APPEND MARCH_VARIANTS "cortexa72\;-march=armv8-a+crc+crypto -mtune=cortex-a72 -DCLIB_N_PREFETCHES=6")
endif()
check_c_compiler_flag("-march=armv8.2-a+crc+crypto -mtune=neoverse-n1" compiler_flag_march_neoversen1)
if(compiler_flag_march_neoversen1)
list(APPEND MARCH_VARIANTS "neoversen1\;-march=armv8.2-a+crc+crypto -mtune=neoverse-n1 -DCLIB_N_PREFETCHES=6")
endif()
endif()
macro(vpp_library_set_multiarch_sources lib)

11
src/vppinfra/cpu.h
View File

@ -322,6 +322,8 @@ clib_cpu_part ()
#define AARCH64_CPU_PART_QDF24XX 0xc00
#define AARCH64_CPU_IMPLEMENTER_CORTEXA72 0x41
#define AARCH64_CPU_PART_CORTEXA72 0xd08
#define AARCH64_CPU_IMPLEMENTER_NEOVERSEN1 0x41
#define AARCH64_CPU_PART_NEOVERSEN1 0xd0c
static inline int
clib_cpu_march_priority_thunderx2t99 ()
@ -350,6 +352,15 @@ clib_cpu_march_priority_cortexa72 ()
return -1;
}
static inline int
clib_cpu_march_priority_neoversen1 ()
{
if ((AARCH64_CPU_IMPLEMENTER_NEOVERSEN1 == clib_cpu_implementer ()) &&
(AARCH64_CPU_PART_NEOVERSEN1 == clib_cpu_part ()))
return 10;
return -1;
}
#ifdef CLIB_MARCH_VARIANT
#define CLIB_MARCH_FN_PRIORITY() CLIB_MARCH_SFX(clib_cpu_march_priority)()
#else