From: David Gibson <david@gibson.dropbear.id.au>
To: matheus.ferst@eldorado.org.br
Cc: peter.maydell@linaro.org, richard.henderson@linaro.org,
f4bug@amsat.org, qemu-devel@nongnu.org, groug@kaod.org,
qemu-ppc@nongnu.org
Subject: Re: [PATCH v2 0/2] target/ppc: Fix vextu[bhw][lr]x on big endian hosts
Date: Fri, 27 Aug 2021 12:42:00 +1000 [thread overview]
Message-ID: <YShQ+JgQYH316OE7@yekko> (raw)
In-Reply-To: <20210826141446.2488609-1-matheus.ferst@eldorado.org.br>
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On Thu, Aug 26, 2021 at 11:14:44AM -0300, matheus.ferst@eldorado.org.br wrote:
> From: Matheus Ferst <matheus.ferst@eldorado.org.br>
>
> The definition of struct Int128 is currently independent of the host
> endianness, causing different results when using the member s128 of
> union ppc_vsr_t in big-endian builds with CONFIG_INT128 or
> !CONFIG_INT128.
>
> The only PPC instructions that seem to be affected by this issue are the
> "Vector Extract Unsigned Byte/Halfword/Word to GPR using GPR-specified
> Left/Right-Index." Even on builds with Int128 support, however, their
> helpers give the wrong result on big-endian hosts.
>
> The first patch in this series changes the definition of struct Int128
> to allow its use in the ppc_vsr_t union. The second patch fixes the
> helper definition.
Applied to ppc-for-6.2, thanks.
>
> Matheus Ferst (2):
> include/qemu/int128.h: define struct Int128 according to the host
> endianness
> target/ppc: fix vextu[bhw][lr]x helpers
>
> include/qemu/int128.h | 27 ++++++++++++++++++++-------
> target/ppc/int_helper.c | 38 ++++++++++----------------------------
> 2 files changed, 30 insertions(+), 35 deletions(-)
>
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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prev parent reply other threads:[~2021-08-27 2:46 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-26 14:14 [PATCH v2 0/2] target/ppc: Fix vextu[bhw][lr]x on big endian hosts matheus.ferst
2021-08-26 14:14 ` [PATCH v2 1/2] include/qemu/int128.h: define struct Int128 according to the host endianness matheus.ferst
2021-08-26 14:14 ` [PATCH v2 2/2] target/ppc: fix vextu[bhw][lr]x helpers matheus.ferst
2021-08-27 2:42 ` David Gibson [this message]
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