SDL_TARGETING(3)

✨ SDL_TARGETING ✨

ok so bestie, welcome to SDL_TARGETING(3) from the SDL3 functions crew 💖 this one's a macro, and it's giving "tell the compiler to build this one specific function for a whole different CPU" energy. iconic behavior, honestly.

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🌸 NAME 🌸

SDL_TARGETING — a macro that tags a function as targeting a specific CPU architecture. yeah. that's the whole job. she's niche but she's powerful. 💅

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🎀 SYNOPSIS 🎀

#include <SDL3/SDL_intrin.h>

#define SDL_TARGETING(x) __attribute__((target(x)))

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🦋 DESCRIPTION 🦋

so basically? this is a lil hint to the compiler saying "hey bestie, build this function with support for a CPU instruction set that might be totally different from the rest of the program." lowkey unhinged, highkey useful. ✨

the deets are laid out in the GCC docs, if you wanna go read them yourself:

https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-target-function-attribute

a classic use case is turning on SSE2 support for one function, even when the rest of your source code was never compiled to use SSE2 at all. like, main character function only:

#ifdef SDL_SSE2_INTRINSICS
static void SDL_TARGETING("sse2") DoSomethingWithSSE2(char *x) {
   ...use SSE2 intrinsic functions, etc...
}
#endif

// later...
#ifdef SDL_SSE2_INTRINSICS
if (SDL_HasSSE2()) {
    DoSomethingWithSSE2(str);
}
#endif

ok so here's the vibe 🧚: the application as a whole is built without SSE2 instructions, so it'll still run on Intel machines that don't support SSE2. but then, at runtime, it checks whether the system supports the instructions, and only then calls into the function that uses SSE2 opcodes. and those ifdefs? they make sure this code isn't even used on platforms that don't have SSE2 at all. no cap, that's the whole strategy. 🫶

and on compilers that don't have target support? this macro is just defined to nothing. poof. gone. defined to nothing, periodt. 💀

oh also — this symbol is used by SDL internally, but apps and other libraries are 100% welcome to use it for their own interfaces too. share the wealth, bestie. 💜

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🌈 AVAILABILITY 🌈

this macro is available since SDL 3.2.0. she's not ancient, she's fresh. ⭐

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heads up bestie: this is a compiler hint, so what it actually does depends on your compiler having target support. on compilers without it, it's a no-op. don't come for me, come for the compiler. 🙈

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and that's the page!! 🌸 brought to you by Simple Directmedia Layer, version SDL 3.4.18, in the SDL_TARGETING(3) era. slay, bye bestie 💖🎀✨