Re: [PATCH v6 06/82] target/arm: Implement SVE2 saturating/rounding bitwise shift left (predicated)

[Richard Henderson]

On 5/11/21 3:43 AM, Peter Maydell wrote:
> > +#define do_sqshl_d(n, m) \
> > +   ({ uint32_t discard; do_sqrshl_d(n, m, false, &discard); })
> Why pass in &discard rather than just NULL ? (Similarly below.)

sat != NULL means enable saturation.

Discard the results because unlike NEON, there is no architectural SVE flag to 
indicate that saturation has occurred.


r~