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   John Regehr (regehr@mastodon.social)'s status on Saturday, 25-Jan-2025 10:33:39 JST John Regehr

   in reply to

   • mx alex tax1a - 2020 (5)
   • William D. Jones
   • Erin 💽✨

   @erincandescent @atax1a @cr1901 I've been working pretty closely with AArch64 for a couple years and it's just a pleasure overall, it has the right bitfield operations, the right addressing modes, the immediate encodings are cute and useful, it's just fun. when I want to be annoyed I compare the codegen for a small C function in RISC-V vs. AArch64

   • Jeff "never puts away anything, especially oven mitts" Cliff, Bringer of Nightmares 🏴‍☠️🦝🐙 🇱🇧🧯 🇨🇦🐧 likes this.
   • Embed this notice
     John Regehr (regehr@mastodon.social)'s status on Saturday, 25-Jan-2025 10:33:39 JST John Regehr

     in reply to

     • mx alex tax1a - 2020 (5)
     • William D. Jones
     • Erin 💽✨

     @erincandescent @atax1a @cr1901 but what this really means is that my LLVM backend bug hunting work should have focused on RISC-V, where the compiler has to try really hard. also, encoding the instructions would have been like 20% of the effort.

     Jeff "never puts away anything, especially oven mitts" Cliff, Bringer of Nightmares 🏴‍☠️🦝🐙 🇱🇧🧯 🇨🇦🐧 likes this.
   • Embed this notice
     Erin 💽✨ (erincandescent@akko.erincandescent.net)'s status on Saturday, 25-Jan-2025 10:33:41 JST Erin 💽✨

     in reply to

     • mx alex tax1a - 2020 (5)
     • William D. Jones

     @atax1a @cr1901 The AArch64 [SU]?BFM instructions are similarly swiss army knife and very pleasing for their flexibility (and how many friendly mnemonics are mapped to them)

   • Embed this notice
     William D. Jones (cr1901@mastodon.social)'s status on Saturday, 25-Jan-2025 10:33:42 JST William D. Jones

     in reply to

     • mx alex tax1a - 2020 (5)

     @atax1a *Looks up rlwinm semantics*

     Wow, that's a mouthful :o... what an interesting insn...

   • Embed this notice
     mx alex tax1a - 2020 (5) (atax1a@infosec.exchange)'s status on Saturday, 25-Jan-2025 10:33:42 JST mx alex tax1a - 2020 (5)

     in reply to

     • William D. Jones

     @cr1901 raymond chen calls it the swiss-army knife of ppc

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     mx alex tax1a - 2020 (5) (atax1a@infosec.exchange)'s status on Saturday, 25-Jan-2025 10:33:43 JST mx alex tax1a - 2020 (5)

     she rlwinm on my immediate til i branch unconditionally [incredibly loud instruction-TLB miss]