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Re: [Qemu-arm] [PATCH v3-a 26/27] target/arm: Extend vec_reg_offset to l


From: Richard Henderson
Subject: Re: [Qemu-arm] [PATCH v3-a 26/27] target/arm: Extend vec_reg_offset to larger sizes
Date: Thu, 17 May 2018 09:51:11 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0

On 05/17/2018 08:57 AM, Peter Maydell wrote:
> This looks right for element sizes up to 8, but I don't understand
> how it handles 16 byte elements as the commit message says -- the
> d[0] and d[1] are the wrong way round and don't form a single
> 16-byte big-endian value, so they must need special casing somewhere
> else ?

You're right that it's not a proper int128 for host arithmetic.  Fortunately,
the only operation we have on 128-bit values, at present, is move.

How better might you word the commit message?


r~



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