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Re: [Qemu-devel] [PATCH v6 15/16] tcg/ppc: Update vector support to v2.0
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From: |
Richard Henderson |
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Subject: |
Re: [Qemu-devel] [PATCH v6 15/16] tcg/ppc: Update vector support to v2.07 |
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Date: |
Tue, 2 Jul 2019 16:25:57 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.1 |
On 7/1/19 1:41 PM, Aleksandar Markovic wrote:
> If we go back to my example, it appears to me that doubleword
> integer max/min Altivec instruction do not depend on VSX in any
> way, or, at least, I did not find anything in Altivec docs that
> mentions it (I could be wrong).
You are correct, for the case of min/max -- and indeed all of the other
arithmetic added in this patch -- we do not need VSX.
However, the load/store instructions added by this patch do require VSX.
AFAIK, there is exactly one v2.07 core design, the power8.
It has both Altivec and VSX, so it's really only a technicality
to check both v2.07 + Altivec + VSX, but I do anyway. It does
not seem worthwhile to decompose these checks further.
r~