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    John Ripley (jripley@mastodon.social)'s status on Saturday, 25-Jan-2025 10:43:21 JSTJohn RipleyJohn Ripley
    in reply to
    • John Regehr

    @regehr There's an insidious problem on targets where the ISA has a few instructions which rely on alignment (e.g some SSE/AVX and even recent ARM). Unaligned access works until the optimizer figures out a way to save a cycle by using the faster vector op, and then it breaks. This turns into a heisenbug where any attempt to track it down breaks the optimization.

    In conversationabout 4 months ago from mastodon.socialpermalink
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