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pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

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Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

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    Patrick Walton‏ @pcwalton 7 Feb 2019
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    Given that _mm_add_epi32() and _mm_sub_epi32() add and subtract four 32-bit integers respectively, you might think that _mm_mul_epi32() multiplies four 32-bit integers. Oh, if only things were that easy in SSE land.

    4:15 PM - 7 Feb 2019
    • 22 Likes
    • Akhil Indurti Mike Penick Diego Bernardes Sibelius Seraphini BrendanEich Sam Grace Sneddon 🏳️‍🌈 (they/them) Heli Skunk 🌻🦨🏴 #BlackLivesMatter Chris McDonald Ethan Smith
    2 replies 0 retweets 22 likes
      1. This Tweet is unavailable.
      2. Andrew Gallant‏ @burntsushi5 7 Feb 2019
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        My favorite is that AVX2's ALIGNR is very different from SSE's ALIGNR. https://github.com/rust-lang/regex/blob/60d087a23025e045ae754a345b04003c31d83d93/src/vector/avx2.rs#L164-L166 …

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      2. Pepijn de Vos‏ @pepijndevos 7 Feb 2019
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        Replying to @pcwalton

        Why? Because 32*32 multiplication has 64 bit results? Or just because reasons...

        1 reply 0 retweets 0 likes
      3. Mischan Toosarani-Hausberger‏ @AboveVacant 8 Feb 2019
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        Replying to @pepijndevos @pcwalton

        Yes, you would need a __mm256i return value which was not really a thing in pre-AVX times. I think that interface trade-off when switching from addition to multiplication is often seen in low-level APIs

        0 replies 0 retweets 0 likes
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      1. EngineersBox‏ @EngineersBox 8 Feb 2019
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        Replying to @pcwalton

        Considering it’s matrix-matrix wouldn’t the result be signed integers that are 64 bit

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