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Re: [PATCH v1 6/6] s390x/tcg: Fix VECTOR SUBTRACT WITH BORROW COMPUTE BO

From: Richard Henderson
Subject: Re: [PATCH v1 6/6] s390x/tcg: Fix VECTOR SUBTRACT WITH BORROW COMPUTE BORROW INDICATION
Date: Fri, 18 Oct 2019 11:55:59 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 
On 10/18/19 9:10 AM, David Hildenbrand wrote:
> +    /* Isolate the carry to the next doubleword */
>      tcg_gen_andi_i64(dl, th, 1);

You can remove this now, since the only possible results are 0/1; it was only
our subtract implementation that produced -1/0.


r~
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