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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. Brendan G Bohannon‏ @cr88192 28 Apr 2017

      working on C compiler for SH: writes out logic for loading a double constant; has thought that on nearly any other arch this would be a joke

      1 reply 0 retweets 0 likes
    2. Brendan G Bohannon‏ @cr88192 28 Apr 2017
      Replying to @cr88192

      on most other arch's, double-load is a single memory load, not a pair of loads; also no PC-rel or direct memory-load operations for FPU...

      2 replies 0 retweets 0 likes
    3. Rich Felker‏ @RichFelker 28 Apr 2017
      Replying to @cr88192

      Huh? fmov.d

      1 reply 0 retweets 0 likes
    4. Brendan G Bohannon‏ @cr88192 28 Apr 2017
      Replying to @RichFelker

      I was meaning PC-rel or absolute loads (like can be done on x86). using fmov.d would require multiple FPSCR reloads & an address register.

      2 replies 0 retweets 0 likes
    5. Rich Felker‏ @RichFelker 28 Apr 2017
      Replying to @cr88192

      mova; fmov.d

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker 28 Apr 2017
      Replying to @RichFelker @cr88192

      Of course you can't put an abs addr or big offset in a 16bit opcode. They're idiomatically put in constant pools adj to fn, with mov.l/mova.

      10:09 AM - 28 Apr 2017
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Brendan G Bohannon‏ @cr88192 28 Apr 2017
          Replying to @RichFelker

          double arith requires PR=1,SZ=0; encoding mov.d requires PR=0,SZ=1. so, reused GPR loading logic, but did "lds r0,fpul; fsts fpul,fr0; ..."

          2 replies 0 retweets 0 likes
        3. Brendan G Bohannon‏ @cr88192 28 Apr 2017
          Replying to @cr88192 @RichFelker

          could probably still save a few operations here, but would need some alternate constant-loading logic to do so...

          0 replies 0 retweets 0 likes
        4. End of conversation

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