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fadis_'s profile
Fadis
Fadis
Fadis
@fadis_

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Fadis

@fadis_

組み込みから*NIXシステム、HPCまで、計算機をこよなく愛するゲームプログラマ。C++を関数型言語と間違えているタイプのC++er。遺伝的FM音源とかの人。 丼:@fadis@mstdn.jp 欲しい物リスト:http://amzn.to/Mzt8F0 

大阪
github.com/Fadis/
Joined July 2010

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    1. Fadis‏ @fadis_ 11 Sep 2014
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      gcc(少なくとも4.7まで それ以降は未確認)のベクタエクステンションはコードが要求した要素数とプロセッサのSIMDレジスタの幅が一致していると確かに速いんだけど、そうでない場合1要素づつ計算した方が速いような酷いコードを吐くんだよな…

      1 reply 3 retweets 4 likes
    2. くろいえのぐ‏ @enogu 11 Sep 2014
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      Replying to @fadis_

      @fadis_ まじで

      1 reply 0 retweets 0 likes
    3. Fadis‏ @fadis_ 11 Sep 2014
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      Replying to @enogu

      @enogu SSE使うとfloat4つの時だけ異様に性能が出て、AVX使うと8つの時だけ異様に性能が出る ._.

      1 reply 1 retweet 1 like
    4. くろいえのぐ‏ @enogu 11 Sep 2014
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      Replying to @fadis_

      @fadis_ つまりARM使えと

      1 reply 0 retweets 0 likes
    5. Fadis‏ @fadis_ 11 Sep 2014
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      Replying to @enogu

      @enogu どうしてそうなったw

      1 reply 0 retweets 0 likes
    6. くろいえのぐ‏ @enogu 11 Sep 2014
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      Replying to @fadis_

      @fadis_ あれにはSIMDは実装されていなかったような。逆にThumbがあるけどw

      1 reply 0 retweets 0 likes
    7. Fadis‏ @fadis_ 11 Sep 2014
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      Replying to @enogu

      @enogu ARMはむしろ中途半端なSIMD(およびSIMDもどき)が乱立しててx86よりカオス

      1 reply 1 retweet 0 likes
    8. くろいえのぐ‏ @enogu 11 Sep 2014
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      Replying to @fadis_

      @fadis_ mjd

      3 replies 0 retweets 0 likes
    9. Fadis‏ @fadis_ 11 Sep 2014
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      Replying to @enogu

      @enogu ARMでSIMD命令とだけ言った場合、32bitレジスタを8bit 4つとみなす命令セットのことで、それとは別にIntelが関わってた時代にIWMMXっていう拡張命令セットがあって、

      1 reply 0 retweets 0 likes
    10. くろいえのぐ‏ @enogu 11 Sep 2014
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      Replying to @fadis_

      @fadis_ XScaleの命令セットなんて公式にフィードバックされているものなんです?

      1 reply 0 retweets 0 likes
      Fadis‏ @fadis_ 11 Sep 2014
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      Replying to @enogu

      @enogu されてないから今日ではIWMMXが動くSoCを見かける事は殆ど無くなったな

      8:28 AM - 11 Sep 2014
      0 replies 0 retweets 0 likes

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