GNU C library 2.33 released

Posted Feb 6, 2021 16:54 UTC (Sat) by Wol (subscriber, #4433)
In reply to: GNU C library 2.33 released by joib
Parent article: GNU C library 2.33 released

> Stupid indeed. One can understand not wanting to spend chip area on large vector units, but fusing out functional units for product segmentation reason? Argh.

Or is this a bit of complex real-estate that has a habit of not working? Fusing out stuff that fails QA and segmenting the product has some logic behind it.

Cheers,
Wol

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GNU C library 2.33 released

Posted Feb 6, 2021 17:49 UTC (Sat) by anton (subscriber, #25547) [Link]

At least Skylake (and its variants up to Comet Lake) can do AVX/AVX2 work with the upper 128 bits of the unit powered down, at lower performance (and it works that way until the upper 128 bits have been powered up). So a better way to deal with both market segmentation and partially failing SIMD units would be to support AVX but on the Pentiums run it without the upper 128 bits of the functional unit. If you wonder about non-working lower 128 bits: then SSE won't work and they cannot sell the die even with disabled AVX.