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    Fabian Giesen (rygorous@mastodon.gamedev.place)'s status on Thursday, 29-May-2025 03:16:57 JSTFabian GiesenFabian Giesen
    in reply to
    • Jessica Paquette
    • John Regehr
    • Owen Anderson

    @regehr @resistor @barrelshifter For some examples:
    - PPC and ARM A64 very visibly go for the rotate+mask approach. PPC does everything with rot left + mask (see e.g. https://devblogs.microsoft.com/oldnewthing/20180810-00/?p=99465), A64 is rot right + mask (https://www.scs.stanford.edu/~zyedidia/arm64/ubfm.html), and the A64 logic immediates use basically the same mask generation logic. (So it can be shared if desired, in a small design.)
    - I have seen datapath details for some Intel designs that used funnel shift right for all usual shifts.

    In conversationabout 14 days ago from gnusocial.jppermalink

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    1. Domain not in remote thumbnail source whitelist: devblogs.microsoft.com
      The PowerPC 600 series, part 5: Rotates and shifts - The Old New Thing
      from Raymond Chen
      Get out your Swiss army knife.
    2. No result found on File_thumbnail lookup.
      UBFM -- A64
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