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I've posted two patches on Phabricator to add support for VScale in LLVM. A brief recap on `vscale`: The scalable vector type in LLVM IR is defined as `<vscale x n x m>`, to create types such as `<vscale x 16 x i8>` for a scalable vector with at least 16 bytes. In the definition of the scalable type, `vscale` is specified as a positive constant of type integer that will only be

...r e.g memcpy or strcpy or anything else which is *not* fixed length and not even the program knows how long the vector will be, there is data-dependent fail-on-first. A related thread goes through this, pay attention to Stephen's questions and it becomes clear: https://groups.google.com/forum/?nomobile=true#!topic/comp.arch/3z3PlCwdq8U A link to ARM SVE ffirst capability is also proved in that thread. Yes, SVE has ffirst although it is a SIMD variant rather than one that affects VL. > RISC-V RVV explicitly allows changing VL (which I am assuming is the > same as vscale) at runtime, so V...