Date: Sat, 5 Jun 2021 23:15:04 +0200 From: Arnd Bergmann <arnd@...nel.org> To: musl@...ts.openwall.com Subject: Re: Adding PowerPC SPE support On Sat, Jun 5, 2021 at 7:12 PM Rich Felker <dalias@...c.org> wrote: > > When the soft-float ABI for PowerPC was added in 2016 (commit > 5a92dd95c77cee81755f1a441ae0b71e3ae2bcdb, mail thread "[PATCH v3] Add > PowerPC soft-float support") with Freescale cpus having the > alternative SPE FPU as the main use case, I noted that we could > probably support hard float on them, but that it would involve > determining some difficult ABI constraints. I'm now revisiting adding > this support. Note that regardless of the technical issues, there is a practical problem in the long run, since gcc-8.5 was the last release with powerpcspe support, and at some point in the future everyone will move to gcc-9 or higher. The last e500/e500v2 based SoCs are now ten years old, and are listed as available until 2025 but also "not recommended for new designs". Linux kernel support for these has been marked as "odd fixes" instead of "maintained" since early 2020, but in practice this has been the case for much longer. If I remember correctly, someone mentioned using musl on bare metal e200 based microcontrollers, which is more interesting for powerpcspe support than Linux user space, but this requires additional patches already. Arnd
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