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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 29 Nov 2018
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    @eddyb_r @Gankro Can we just make node_ids in rustc pseudorandom sequences to begin with and then make the hash the identity function? Do node_ids have to be sequential?

    11:00 AM - 29 Nov 2018
    • 3 Likes
    • nick fitzgerald Jed Davis 🏳️‍🌈 Manish
    2 replies 0 retweets 3 likes
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      2. Manish‏ @ManishEarth 29 Nov 2018
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        Replying to @pcwalton @eddyb_r

        Stylo's PrecomputedHashMap approach is similar: atoms already contain a hash so we use a pass through hasher

        1 reply 0 retweets 0 likes
      3. Patrick Walton‏ @pcwalton 29 Nov 2018
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        Replying to @ManishEarth @eddyb_r

        musl’s random number generator should have period 2^31: see https://en.wikipedia.org/wiki/Linear_congruential_generator#c%E2%89%A00 … https://git.musl-libc.org/cgit/musl/tree/src/prng/rand.c …

        0 replies 0 retweets 0 likes
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      2. eddyb, thriving in isolation,‏ @eddyb_r 29 Nov 2018
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        Replying to @pcwalton

        NodeId's aren't used that much anymore. this approach would be interesting for DefId (which types also contain) though!

        2 replies 0 retweets 3 likes
      3. Niko Matsakis‏ @nikomatsakis 29 Nov 2018
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        Replying to @eddyb_r @pcwalton

        I've definitely thought about this for `DefId`. Actually I had planned to make a `DefId` be literally a cryptographic hash of its contents, I don't know that I had considered *random* hashes assigned on creation. The former persists across incremental sessions, which is nice.

        0 replies 0 retweets 1 like
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