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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 10 Feb 2018
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      Does anyone have a license for @synopsys VCS and can report bugs? People are sending me patches for my open source IP cores to work around bugs in VCS handling of signed expressions. I'm not going to merge them. Fix VCS instead! Ugh!

      3 replies 3 retweets 7 likes
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    2. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 10 Feb 2018
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      From the simulation traces I've been shown and the proposed patch it looks like VCS is (at least in some situations) using the LHS of an assignment to determine the signedness of the RHS expression. That is of course *not* how Verilog works. (See 5.5.1 of IEEE Std 1364-2005.)pic.twitter.com/eTSafVIAu4

      1 reply 1 retweet 5 likes
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    3. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 10 Feb 2018
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      I'd post a MCVE for this but of course I can't create one because I don't have access to a copy of VCS. Here is all the information I have: https://github.com/cliffordwolf/picorv32/issues/33 … https://github.com/cliffordwolf/picorv32/pull/53 ….

      1 reply 0 retweets 0 likes
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    4. Viacheslav T.‏ @c60k28 10 Feb 2018
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      Replying to @oe1cxw

      The issue is closed, do you still wants input here?

      1 reply 0 retweets 0 likes
      Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 10 Feb 2018
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      Replying to @c60k28

      The issue is closed because this is not a bug in PicoRV32. It's a bug in VCS and therefore not my problem. But I still think it would be good to let @synopsys know that their tools seems to be broken.

      6:51 AM - 10 Feb 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        1. Viacheslav T.‏ @c60k28 10 Feb 2018
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          Replying to @oe1cxw @synopsys

          Just commented, I'll be around if you want to run different test.

          1 reply 0 retweets 1 like
        2. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 10 Feb 2018
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          Replying to @c60k28 @synopsys

          Thanks for running the test. For anyone reading along: Looks like the VCS bug is fixed in recent versions of VCS.https://github.com/cliffordwolf/picorv32/issues/33#issuecomment-364670154 …

          0 replies 0 retweets 1 like
          3. End of conversation

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