[Conscat]

QBE has no support for SIMD last I looked into it, so I don't think it would be appropriate for an SPMD language. https://todo.sr.ht/~mpu/qbe/5

It's common for shader compilers to invent their own IR, like Shadey and Slang IR.

[rurban]

That link just says that the maintainer of the fork mpu for hare has no will nor abilities to add full SIMD support. But qbe is still written and maintained by Brian Callahan here: https://c9x.me/compile/