[Bug backends/27925] riscv backend only provides return value locations for code compiled for LP64D ABI

[wilson at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27925

--- Comment #5 from Jim Wilson <wilson at gcc dot gnu.org> ---
I hadn't thought about the kernel.  It is compiled LP64 and with the FP
extensions disabled, to avoid accidentally using FP registers.  It does
save/restore FP registers in the context switching code, but otherwise doesn't
use FP registers, so that we don't have to save/restore FP registers in system
calls.  If there are no FP types in the kernel then LP64D will behave
identically to LP64.  But if you have a testsuite that checks all features,
then we would have to implement LP64 correctly, and your patch is a step in the
right direction.

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