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oe1cxw's profile
Claire Xen 🏳️‍⚧️🏳️‍🌈🧙🏻‍♀️ BLM 🏴🚩
Claire Xen 🏳️‍⚧️🏳️‍🌈🧙🏻‍♀️ BLM 🏴🚩
Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩
@oe1cxw

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Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩

@oe1cxw

Neurodiverse trans geek girl. Yosys, RISC-V, SAT/SMT.

She/her/hers
clairexen.net
Joined September 2014

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    1. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 15 Sep 2017
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      I fell like no matter what else I'll do in life, I'll go to hell just for that last line.pic.twitter.com/qDuTYPUFIm

      29 replies 95 retweets 298 likes
    2.  🎮 Pavel Bibergal‏ @cyberkm 15 Sep 2017
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      Replying to @oe1cxw @hugin84

      Just make sure that your optimizing compiler will not consider it as undefined behavior and make "wonders" for you.

      1 reply 0 retweets 6 likes
    3.  🎮 Pavel Bibergal‏ @cyberkm 15 Sep 2017
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      Replying to @cyberkm @oe1cxw @hugin84

      Personally I would use inline assembly and set the Program Counter to 0. Explicitly, better readability compiler will not optimize it out.

      1 reply 0 retweets 6 likes
    4. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 15 Sep 2017
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      Replying to @cyberkm @hugin84

      Would still need a linker symbol for addr 0 tho: I'm pretty sure writing to a null pointer is also UB and might be optimized away as well.

      1 reply 0 retweets 1 like
    5. Boris Claas Kiefer‏ @hugin84 15 Sep 2017
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      Replying to @oe1cxw @cyberkm

      UB is a C thing, the linker should(tm) only rip out stuff that's not used

      2 replies 0 retweets 3 likes
    6. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 15 Sep 2017
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      Replying to @hugin84 @cyberkm

      Yes. I know. That's why I said I need a linker symbol for addr 0: So that the compiler does not treat it is a null pointer.pic.twitter.com/tVOJa3T9Ht

      5 replies 8 retweets 25 likes
    7. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 15 Sep 2017
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      Replying to @oe1cxw @hugin84

      What did you think I meant when I said that I need a linker symbol for addr 0 because writing to a null pointer is UB?

      1 reply 0 retweets 0 likes
    8. Boris Claas Kiefer‏ @hugin84 15 Sep 2017
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      Replying to @oe1cxw

      you replied to the inline asm comment, inline asm is off limits for the compiler, so I thought you were talking about linker doing things

      1 reply 0 retweets 1 like
    9. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 15 Sep 2017
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      Replying to @hugin84

      Ah, okay. What I meant was that putting the function call in inline asm isn't sufficient because the write to *dst_ptr is also UB when >>

      1 reply 0 retweets 1 like
      Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 15 Sep 2017
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      Replying to @oe1cxw @hugin84

      >> the compiler can see that it's a null pointer. Therefore I must hide the address in a linker symbol so compiler doesn't know it's null.

      11:05 AM - 15 Sep 2017
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      • SΞbastien F4GRX
      1 reply 0 retweets 1 like
        1. Boris Claas Kiefer‏ @hugin84 15 Sep 2017
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          Replying to @oe1cxw

          true, I missed that. volatile global variable would also work

          0 replies 0 retweets 1 like
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