https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106977
--- Comment #14 from Iain Sandoe <iains at gcc dot gnu.org> --- (In reply to ibuclaw from comment #13) > Confirmed, D is doing NRVO return whereas C++ isn't. I am not sure that the NVRO is the issue (it is correct ABI for an 8 byte struct to be returned in EAX:EDX). The value can be "created" in the return slot (i.e. doing the NVRO) without altering that. ------ If the caller is passing two regs it seems to me likely that (for some reason it thinks that the value is returned via an sret pointer). The callee then get s the set pointer in the register it is expecting *this to be in... and boom .. we are broken at some point, So it would seem that we might want to find a reproducer that we can look at the various tree dumps and see if/where an sret is introduced? (if that's not the cause, then we'll have to find a new hypothesis)
