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Re: [PATCH 2/4] target/ppc: added solutions for building with disable-tc

From: Richard Henderson
Subject: Re: [PATCH 2/4] target/ppc: added solutions for building with disable-tcg
Date: Mon, 12 Apr 2021 08:40:47 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1

On 4/11/21 10:08 PM, David Gibson wrote:
Not directly related to what you're trying to accomplish here, but the
whole vscr_sat thing looks really weird.  I have no idea why we're
splitting out the storage of VSCR[SAT] for the TCG case at all.  If
you wanted to clean that up as a preliminary, I'd be grateful.

That's about efficiently implementing the vector saturation instructions in TCG. See GEN_VXFORM_SAT in translate/vmx-impl.c.inc.

The SAT bit is represented as a vector that e.g. compares the result of addition with the result of saturating addition. We don't need to resolve that to a single bit until the VSCR register is read.


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