musl - Re: [PATCH] riscv: declare all vector registers as clobbers of syscalls

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Message-ID: <65f31ff1-e386-ad20-5260-d07bdd2a4c20@ispras.ru>
Date: Sun, 4 Oct 2026 10:14:21 +0300 (MSK)
From: Alexander Monakov <amonakov@...ras.ru>
To: musl@...ts.openwall.com
cc: Rich Felker <dalias@...c.org>, 
    Alex Rønne Petersen <alex@...xrp.com>
Subject: Re: [PATCH] riscv: declare all vector registers as clobbers
 of syscalls


On Sun, 4 Oct 2026, Alex Rønne Petersen wrote:

> > Is there a predefined macro that declares the availability of these
> > registers that we could use? I really do not want to hard-code
> > particular gcc or clang versions.
> 
> Unfortunately no:
> 
>     $ riscv64-linux-gnu-gcc -march=rv64gc -dM -E - < /dev/null | grep __riscv

But this is not the right test. You have to diff -E -dM from two runs, one with
-march=rv64gc, another with -march=rv64gcv (and you'll find __riscv_vector).

HTH
Alexander

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