gazaxian

Gaz Liddon • Co-Studio Head • Rockstar Dundee • Ancient Artifact • All views are my own

[gazaxian @gyratory]

Fantastic video about reverse engineering and emulation

https://t.co/1J0A7aL31T

[Double Eleven @DoubleElevenLtd]

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Read More: https://t.co/9WzBTjXXxd

[Rockstar Games @RockstarGames]

Red Dead Redemption and Undead Nightmare are coming to Netflix, iOS, Android, PS5, Xbox Series X|S, and Nintendo Switch 2 on Dec 2.

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[gazaxian @gyratory]

@Jonathan_Blow @atlanticesque It's a good choice for compiler dev :)

[gazaxian @gyratory]

@grantkirkhope Someone’s noticed your tritoning :)

https://t.co/BERbxwWtuF

[gazaxian @gyratory]

@UridiumAuthor My favourite inception trufax is the famous inception honking noise is Non, je ne regrette rien slowed down. https://t.co/nwlzP4WYCe

[gazaxian @gyratory]

@Jonathan_Blow “up” goes to the subsequent stack frame. Stack frames are numbered, your current stack frame is 0 and “up” increases that value

[gazaxian @gyratory]

@t2_steve @UridiumAuthor On X64 checking if a float value is negative is 1 instruction (UCOMISS). I think it’d be two if you want to check the top bit

[gazaxian @gyratory]

@mandola_kl @t2_steve @UridiumAuthor It is a bit :D I'd probably use isnan() from the standard library

https://t.co/6y0dIILfPE

[gazaxian @gyratory]

@UridiumAuthor Ah, MSVC has similar options.

I don't do much C/C++ these days and the languages I like to do hobby projects focus on removing undefined behaviour like this :)

https://t.co/h432PQ7HLZ

[gazaxian @gyratory]

@UridiumAuthor What compiler are you using? With Clang, you can get the compiler to insert run-time checks for various undefined behaviours, including FP problems. It's helpful to have these options on for dev builds and turn them off for release

https://t.co/s1XsnJbRLS

[gazaxian @gyratory]

@UridiumAuthor And this guy's videos are great. They are almost wholly about compute vs. memory bottlenecks on a system with ridiculously high latency memory access.

https://t.co/d9nb1GQqTZ

[gazaxian @gyratory]

@UridiumAuthor Mike's a game programmer BTW

[gazaxian @gyratory]

@UridiumAuthor Yeah, it has divides; a latency of around 20 cycles but they dispatch in a cycle and as long as you don’t need the results during the latency period you can carry on executing instructions

[gazaxian @gyratory]

@UridiumAuthor Oh for sure but it hasn’t been that way for a while; CPU’s got a lot faster but memory didn’t keep pace. Funnily enough quick arm / x64 code for x+y*40 uses shifts rather muls :)

[gazaxian @gyratory]

@UridiumAuthor and I -think- it’d be 7 cycles for a table lookup with the potential for a cache vs 5 for calculating x*40+y in X64

[gazaxian @gyratory]

@UridiumAuthor In Arm64 the calculation of x+y*40 is around 3 cycles with zero cache penalty