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arch/Config.in.x86: add support for x86-64-v2, x86-64-v3, x86-64-v4

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In the face of the vast amount of x86-64 CPU architecture variants,
Linux distributions have worked together to define "micro-architecture
levels" in the x86-64 psABI, called x86-64-v2, x86-64-v3 and
x86-64-v4. They standardize a set of CPU features, and GCC since its
version 11.x has support for these micro-architecture levels as
-march= options.

It makes sense to support them in Buildroot, especially for those who
want to build toolchains that aim at targeting a reasonably broad
family of x86-64 processors.

It only really makes sense to use as 64-bit CPUs, and not as 32-bit
ones, so we guard them behind BR2_x86_64.

More details:

 https://gitlab.com/x86-psABIs/x86-64-ABI/-/blob/master/x86-64-ABI/low-level-sys-info.tex
 https://developers.redhat.com/blog/2021/01/05/building-red-hat-enterprise-linux-9-for-the-x86-64-v2-microarchitecture-level
 https://www.phoronix.com/scan.php?page=news_item&px=GCC-11-x86-64-Feature-Levels
 https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=59482fa1e7243bd905c7e27c92ae2b89c79fff87

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
[yann.morin.1998@free.fr:
  - they are x86-64-only CPUs
  - add gcc commit URL
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
This commit is contained in:
Thomas Petazzoni 2022-01-09 09:01:23 +01:00 committed by Yann E. MORIN
parent d6ce2a1681
commit eeace1cc13
1 changed files with 63 additions and 0 deletions
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arch/Config.in.x86
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@ -92,6 +92,66 @@ config BR2_x86_x86_64
"Generic CPU with 64-bit extensions" by the GCC
documentation. It is a 64-bit CPU with MMX, SSE and SSE2
support.
config BR2_x86_x86_64_v2
bool "x86-64-v2"
depends on BR2_x86_64
select BR2_X86_CPU_HAS_MMX
select BR2_X86_CPU_HAS_SSE
select BR2_X86_CPU_HAS_SSE2
select BR2_X86_CPU_HAS_SSE3
select BR2_X86_CPU_HAS_SSSE3
select BR2_X86_CPU_HAS_SSE4
select BR2_X86_CPU_HAS_SSE42
select BR2_ARCH_NEEDS_GCC_AT_LEAST_11
help
This option corresponds to the x86-64-v2 micro-architecture
level, as defined by the x86-64 psABI document, see
https://gitlab.com/x86-psABIs/x86-64-ABI/-/blob/master/x86-64-ABI/low-level-sys-info.tex.
It is close to the Nehalem CPU architecture, and is
applicable for CPUs that support CMPXCHG16B, LAHF-SAHF,
POPCNT, SSE3, SSE4.1, SSE4.2, SSSE3.
config BR2_x86_x86_64_v3
bool "x86-64-v3"
depends on BR2_x86_64
select BR2_X86_CPU_HAS_MMX
select BR2_X86_CPU_HAS_SSE
select BR2_X86_CPU_HAS_SSE2
select BR2_X86_CPU_HAS_SSE3
select BR2_X86_CPU_HAS_SSSE3
select BR2_X86_CPU_HAS_SSE4
select BR2_X86_CPU_HAS_SSE42
select BR2_X86_CPU_HAS_AVX
select BR2_X86_CPU_HAS_AVX2
select BR2_ARCH_NEEDS_GCC_AT_LEAST_11
help
This option corresponds to the x86-64-v3 micro-architecture
level, as defined by the x86-64 psABI document, see
https://gitlab.com/x86-psABIs/x86-64-ABI/-/blob/master/x86-64-ABI/low-level-sys-info.tex.
It is close to the Haswell CPU architecture, and is
applicable for CPUs that support all of x86-64-v2 plus AVX,
AVX2, BMI1, BMI2, F16C, FMA, LZCNT, MOVBE, XSAVE.
config BR2_x86_x86_64_v4
bool "x86-64-v4"
depends on BR2_x86_64
select BR2_X86_CPU_HAS_MMX
select BR2_X86_CPU_HAS_SSE
select BR2_X86_CPU_HAS_SSE2
select BR2_X86_CPU_HAS_SSE3
select BR2_X86_CPU_HAS_SSSE3
select BR2_X86_CPU_HAS_SSE4
select BR2_X86_CPU_HAS_SSE42
select BR2_X86_CPU_HAS_AVX
select BR2_X86_CPU_HAS_AVX2
select BR2_ARCH_NEEDS_GCC_AT_LEAST_11
help
This option corresponds to the x86-64-v4 micro-architecture
level, as defined by the x86-64 psABI document, see
https://gitlab.com/x86-psABIs/x86-64-ABI/-/blob/master/x86-64-ABI/low-level-sys-info.tex.
It is applicable for CPUs that support all of x86-64-v3 plus
AVX512F, AVX512BW, AVX512CD, AVX512DQ, AVX512VL.
config BR2_x86_nocona
bool "nocona"
select BR2_X86_CPU_HAS_MMX
@ -293,6 +353,9 @@ config BR2_GCC_TARGET_ARCH
default "pentium4" if BR2_x86_pentium4
default "prescott" if BR2_x86_prescott
default "x86-64" if BR2_x86_x86_64
default "x86-64-v2" if BR2_x86_x86_64_v2
default "x86-64-v3" if BR2_x86_x86_64_v3
default "x86-64-v4" if BR2_x86_x86_64_v4
default "nocona" if BR2_x86_nocona
default "core2" if BR2_x86_core2
default "corei7" if BR2_x86_corei7