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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. Steve Canon‏ @stephentyrone 18 Nov 2017
      Replying to @stephentyrone @oshepherd and

      Not a big problem when writing from scratch. Massive goddamn pain in the ass when trying to patch hand-written asm designed to use everything available.

      1 reply 0 retweets 2 likes
    2. Steve Canon‏ @stephentyrone 18 Nov 2017
      Replying to @stephentyrone @oshepherd and

      Could be worse though, could be Cortex-M0 asm.

      1 reply 0 retweets 0 likes
    3.  🎃 unsafe { mem::transmute(@erincandescent) }  🎃‏ @erincandescent 18 Nov 2017
      Replying to @stephentyrone @hikari_no_yume and

      ...That is Thumb-1 (its a complete superset of the usermode ARMv4T instructions)

      1 reply 0 retweets 0 likes
    4. Steve Canon‏ @stephentyrone 18 Nov 2017
      Replying to @erincandescent @oshepherd and

      Yeah, you’re right. For some reason I was misremembering having CLZ. Ugh, bad memories.

      1 reply 0 retweets 2 likes
    5. Steve Canon‏ @stephentyrone 18 Nov 2017
      Replying to @stephentyrone @oshepherd and

      (FFS people, when you design an ISA, put CLZ in. The fact that you never see it in high-level languages does not mean it’s not necessary.)

      2 replies 0 retweets 4 likes
    6. Steve Canon‏ @stephentyrone 18 Nov 2017
      Replying to @stephentyrone @oshepherd and

      Someone really needs to publish a paper that’s just a list of bad ISA and ABI decisions and why they’re bad and what to do instead.

      5 replies 4 retweets 26 likes
    7.  🎃 unsafe { mem::transmute(@erincandescent) }  🎃‏ @erincandescent 18 Nov 2017
      Replying to @stephentyrone @hikari_no_yume and

      Starting point: * Your ISA should have [R+R<<k] loads/stores * An instruction which can compute A=B+C<<k is incredibly useful * 20-bit branch range is not enough (look at the size of a chromium lib sometime) * Have something like A64 BFM or PPC RLWINM

      5 replies 0 retweets 14 likes
    8. Steve Canon‏ @stephentyrone 18 Nov 2017
      Replying to @erincandescent @oshepherd and

      Some starter notes for the ABI side: - do not pass FP values in GPR. When you’re bringing up a new arch, you’ll benchmark the math library and think this is a good idea. It isn’t. The math library is not at all like other FP code.

      2 replies 1 retweet 4 likes
    9. Steve Canon‏ @stephentyrone 18 Nov 2017
      Replying to @stephentyrone @oshepherd and

      - do not place struct return pointers or va_args counts in one of the normal param registers. You want to have a single map from parameter types and positions to registers / memory.

      2 replies 0 retweets 1 like
    10. rcombs, now 100% asbestos-free‏ @11rcombs 18 Nov 2017
      Replying to @stephentyrone @oshepherd and

      can we say "do not put va_args parameters in registers"

      2 replies 0 retweets 1 like
      Rich Felker‏ @RichFelker 18 Nov 2017
      Replying to @11rcombs @stephentyrone and

      This pessimizes certain mildly variadic functions like open(2).

      7:33 PM - 18 Nov 2017
      0 replies 0 retweets 0 likes

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