[Bug target/99773] ARM v8.1-m MVE interaction with -mfloat-abi not clear

[rearnsha at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99773

--- Comment #1 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
-march=armv8.1-m.main+mve -mfloat-abi=hard should use the VFP registers for
passing any FP arguments so the build attribute for Tag_ABI_VFP_args should be
set to show that.

It's true that soft-float routines will still be needed to do any FP operations
in this case, but that doesn't affect the ABI at public interfaces.