From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: Rashmica Gupta <rashmica@linux.ibm.com>, linuxppc-dev@lists.ozlabs.org
Cc: alistair@popple.id.au, npiggin@gmail.com
Subject: Re: [PATCH] selftests/powerpc: Fix matrix multiply assist test
Date: Fri, 29 Jul 2022 23:03:06 +1000 [thread overview]
Message-ID: <165909978606.253830.18356182209193654780.b4-ty@ellerman.id.au> (raw)
In-Reply-To: <20220617043935.428083-1-rashmica@linux.ibm.com>
On Fri, 17 Jun 2022 14:39:35 +1000, Rashmica Gupta wrote:
> The ISA states: "when ACC[i] contains defined data, the contents of VSRs
> 4×i to 4×i+3 are undefined until either a VSX Move From ACC instruction
> is used to copy the contents of ACC[i] to VSRs 4×i to 4×i+3 or some other
> instruction directly writes to one of these VSRs." We aren't doing this.
>
> This test only works on Power10 because the hardware implementation
> happens to map ACC0 to VSRs 0-3, but will fail on any other implementation
> that doesn't do this. So add xxmfacc between writing to the accumulator
> and accessing the VSRs.
>
> [...]
Applied to powerpc/next.
[1/1] selftests/powerpc: Fix matrix multiply assist test
https://git.kernel.org/powerpc/c/cd1e64935f79e31d666172c52c951ca97152b783
cheers
prev parent reply other threads:[~2022-07-29 13:22 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-17 4:39 [PATCH] selftests/powerpc: Fix matrix multiply assist test Rashmica Gupta
2022-07-29 13:03 ` Michael Ellerman [this message]
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