FUTHARK-ISPC(1)

💖 FUTHARK-ISPC(1) 💖

okay bestie, welcome to the futhark-ispc page — it lives in section 1 of the Futhark manual and it's literally the tool that turns your Futhark into multithreaded ISPC 🔥

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✨ NAME ✨

futhark-ispc — compile Futhark to multithreaded ISPC 🦋

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🌸 SYNOPSIS 🌸

futhark ispc [options...] <program.fut>

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💅 DESCRIPTION 💅

so here's the tea: futhark ispc takes your Futhark program and translates it into a lil combo of C and ISPC code, and ISPC is the one handling all the parallel loops. main character energy fr 💫

Other than that it acts basically the same as futhark-multicore. And heads up bestie — you need to have ispc chillin' on your PATH. no ispc, no vibes 😭

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🎀 OPTIONS 🎀

It accepts the exact same options as futhark-multicore. that's it, that's the section, go read that one, iykyk 👑

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🌈 ENVIRONMENT VARIABLES 🌈

• CC — the C compiler that compiles your program. If you leave it unset it defaults to cc. 💜
• CFLAGS — a space-separated list of options you pass to the C compiler. If it's unset, it defaults to -O3 -std=c99 -pthread. ✨
• ISPCFLAGS — a space-separated list of options you pass to ispc. If it's unset, it defaults to -O3 --woff. 💖

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⭐ EXECUTABLE OPTIONS ⭐

The executables that get generated accept the same options as the ones generated by futhark-multicore. twin behaviour fr fr 🫶

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🧚 LIBRARY USAGE 🧚

okay this part matters. when you compile a program called foo.fut using futhark ispc --library, you get a foo.kernels.ispc file dropped into existence. that file has to be compiled with ispc and then linked with your final program. no skipping steps bestie 🙈

like, for example:

$ ispc -o foo.kernels.o foo.kernels.ispc --addressing=64 --pic --woff -O3

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💀 BUGS 💀

ngl, right now this only works on Unix-like systems, because it depends on pthreads. the good news? adding Windows support would likely not be difficult. so like… someone should do it 👀

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👑 SEE ALSO 👑

futhark-multicore, futhark-test

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Copyright 2013-2020, DIKU, University of Copenhagen 💜

so yeah, that's the whole vibe check. this was Futhark version 0.25.32, dated Mar 11, 2026, and that's the FUTHARK-ISPC(1) page — slay, go compile something iconic ✨💅