[PATCH] D151347: [RISCV] Use vfslide1down for build_vectors of non-constant floats

[Craig Topper via Phabricator via llvm-commits]

craig.topper added a comment.

There's a general note at the beginning of section 10. Vector Arithmetic Instruction Formats

  For floating-point operations, the scalar can be taken from a scalar f register. If FLEN > SEW, the value in the f registers is checked for a valid NaN-boxed value, in which case the least-signi