[PATCH] D75729: [RISCV] Select +0.0 immediate using fcvt.{d, s}.{x, w} fN, x0

[Luís Marques via Phabricator via llvm-commits]

luismarques added a comment.

GCC seems to use `fmv.s.x` / `fmv.d.x` (the former of which now should be called `fmv.w.x`? ) instead of `fcvt`, not sure why. A quick Googling returned:

http://gcc.1065356.n8.nabble.com/New-Port-for-RISC-V-td1338959.html

> +;; Floating-point constant +0.0, used for FCVT-based moves when FMV is
>  +;; not available in RV32.

Which would suggest that, at least at some point in the past, there was a reason for preferring FMV over FCVT? Weird. I have to look into that more carefully.


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