[#Compiler] Day 1 of #AoCO2025 Study Notes
While the original uses #CompilerExplorer, I wanted to replicate the analysis locally.
In this post, I have used #gcc, #clang, llvm-objdump and #LLDB to analyze.
Read more here: https://gapry.github.io/2026/01/01/Advent-of-Compiler-Optimisations-Study-Notes-01.html
`error: cannot tail-call: return value used after call` is a bad error message when the real cause is "return type is too large" (on x86-64 bigger than 16B; on arm bigger than 4B).
(Also, I can guess at what code it wants to generate that it can't tail-call such things, but also that's silly code.)
I don't imagine that the fixes for such things are easy.
I wish #GCC had a way for me to specify a function-scoped cleanup function; for use with my alloca()-allocated variables.
block-scoped: alloc=VLA, cleanup=[[gnu::cleanup()]]
function-scoped: alloc=alloca(), cleanup=???
@mrmasterkeyboard @hexaheximal In terms of architectures I'm mostly limited by time, hardware that I have access to and toolchain support.
If @musl / #musl (or rather the musl-cross binaries) and #toybox as well as #Linux and #Clang / #LLVM or #GCC support go and #boot is documented porting is relatively "easy"…
_OS/1337 OFC doesn't have much to it so compared to #AdelieLinux, it should be straightforward.
#OS1337 on #Xenon is quite low on the list but still not on the bottom because I have systems in my possession. Unlike "normal" #32bit #PowerPC systems.
Gapry
Luke T. Shumaker
Kevin Karhan 
_OS/1337 (or even multithreading) support built-in, which on most modern systems results in dogshit performance below rated base clock because modern CPUs and Chipsets expect the OS to communicate with them and if it doesn't they gonna assume the OS is fubar and drop into failsafe modes. With some luck they may even prevent the CPU from frying itself and turn on the fan on their own.I don't have much hands-on aside from mainstream #ix86 / #x86 / #amd64 Systems and #ARMv5r11 / #ARM64 SBCs.
Somali, Mİsİr, Cibuti ve KİK, İsrailın Somalilandı tanıma kararına kınama dilekçesi sundu. Bu hamle, ulusátığı hukuk ve bölgesel bağımılık önceçeği tür siçmenin önce kınma oldu
Detaylı daçılar. Detaylar sizin işi
[Перевод] Когда компиляторы удивляют
Компиляторы то и дело удивляют меня очень хитрыми трюками. Когда я впервые увидел эту оптимизацию, то едва смог поверить в её реальность. Я изучал оптимизацию циклов и написал простую функцию, суммирующую все числа до заданного значения...
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