Re: expected baseline changes for forky => isa for arch available

Hi,

On 2026-08-17 12:02, Bastien Roucaries wrote:
> Le jeudi 13 août 2026, 15:17:09 heure d’été d’Europe centrale Bastien Roucaries a écrit :
> 
> > > and the result will be that the package fails to install on baseline 
> > > CPUs, and only installs successfully on those CPUs where it can actually 
> > > work.
> > 
> > You could even now test at run time using isa-support package and 
> > /usr/libexec/x86_64-linux-gnu/isa-support/test-SSE3
> > /usr/libexec/x86_64-linux-gnu/isa-support/test-SSE4.1
> > /usr/libexec/x86_64-linux-gnu/isa-support/test-SSE4.2
> > /usr/libexec/x86_64-linux-gnu/isa-support/test-x86-64-v2
> > /usr/libexec/x86_64-linux-gnu/isa-support/test-x86-64-v3
> > 
> > qemu command are available in case of problem:
> > /usr/libexec/x86_64-linux-gnu/isa-support/qemu-bad-SSE3
> > /usr/libexec/x86_64-linux-gnu/isa-support/qemu-bad-SSE4.1
> > /usr/libexec/x86_64-linux-gnu/isa-support/qemu-bad-SSE4.2
> > /usr/libexec/x86_64-linux-gnu/isa-support/qemu-bad-x86-64-v2
> > /usr/libexec/x86_64-linux-gnu/isa-support/qemu-bad-x86-64-v3
> > /usr/libexec/x86_64-linux-gnu/isa-support/qemu-good-SSE3
> > /usr/libexec/x86_64-linux-gnu/isa-support/qemu-good-SSE4.1
> > /usr/libexec/x86_64-linux-gnu/isa-support/qemu-good-SSE4.2
> > /usr/libexec/x86_64-linux-gnu/isa-support/qemu-good-x86-64-v2
> > /usr/libexec/x86_64-linux-gnu/isa-support/qemu-good-x86-64-v3
> > 
> > run it with program and you could check if program run with or without extra instruction.
> 
> 
> Now we have
> [amd64]
> /usr/libexec/x86_64-linux-gnu/isa-support/test-SSE3
> /usr/libexec/x86_64-linux-gnu/isa-support/test-SSE4.1
> /usr/libexec/x86_64-linux-gnu/isa-support/test-SSE4.2
> /usr/libexec/x86_64-linux-gnu/isa-support/test-x86-64-v2
> /usr/libexec/x86_64-linux-gnu/isa-support/test-x86-64-v3
> 
> [arm64]
> /usr/libexec/aarch64-linux-gnu/isa-support/test-ARMv8CRC
> 
> [armhf]
> /usr/libexec/arm-linux-gnueabihf/isa-support/test-ARMv8
> /usr/libexec/arm-linux-gnueabihf/isa-support/test-ARMv8CRC
> /usr/libexec/arm-linux-gnueabihf/isa-support/test-arm64-baseline
> /usr/libexec/arm-linux-gnueabihf/isa-support/test-neon
> 
> [i386] (test-SSE2 retained for compatibility)
> /usr/libexec/i386-linux-gnu/isa-support/test-SSE2
> /usr/libexec/i386-linux-gnu/isa-support/test-SSE3
> /usr/libexec/i386-linux-gnu/isa-support/test-SSE4.1
> /usr/libexec/i386-linux-gnu/isa-support/test-SSE4.2
> /usr/libexec/i386-linux-gnu/isa-support/test-amd64-baseline
> /usr/libexec/i386-linux-gnu/isa-support/test-i386-baseline
> /usr/libexec/i386-linux-gnu/isa-support/test-x86-64-v1
> /usr/libexec/i386-linux-gnu/isa-support/test-x86-64-v2
> /usr/libexec/i386-linux-gnu/isa-support/test-x86-64-v3
> 
> [ppc64]
> /usr/libexec/powerpc64-linux-gnu/isa-support/test-altivec
> /usr/libexec/powerpc64-linux-gnu/isa-support/test-power10
> /usr/libexec/powerpc64-linux-gnu/isa-support/test-power8
> /usr/libexec/powerpc64-linux-gnu/isa-support/test-power9
> 
> [s390x]
> /usr/libexec/s390x-linux-gnu/isa-support/test-z14
> /usr/libexec/s390x-linux-gnu/isa-support/test-z15
> /usr/libexec/s390x-linux-gnu/isa-support/test-z16
> /usr/libexec/s390x-linux-gnu/isa-support/test-z17
> 
> Note that this program does not depends on proc, and work under qemu. So are safe to use.
> 
> Will like to have isa ABI test for loong64 and riscv64

I don't think we want to add any test for riscv64 at this stage. RISC-V 
is still a young architecture, so requiring newer extensions for some 
packages means requiring very recent hardware. For instance we do not 
support any hardware with vector extension in trixie, so I do not think 
it is fair requiring that, even for some packages, in forky.

On the other hand runtime detection and support for newer extensions is 
definitely welcome provided it works.

Regards
Aurelien

-- 
Aurelien Jarno                          GPG: 4096R/1DDD8C9B
[email protected]                     http://aurel32.net

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