[linuxsh-shmedia-dev] Re: SH5 gcc bug

[kaz K. <kk...@rr...>]

Joern Rennecke <joe...@su...> wrote:
> No, the bug has never been in the fsf compiler in the first place, but for
> the wrong reasons.  The generic code plays fast and loose with subregs
> if you let it, which can result in incorrect no-op truncations from 64
> to 32 bits - the ABI requires a sign extension.  We have fixed this in
> our compiler version, but in the end we had to disable the base register
> + index register addressing mode.  There is a plan how to fix the problem
> while still allowing this addressing mode, but it uses a completely
> different approach, and it will require some significant amount of work
> to implement.

Ah, I understand. Thanks for the clarification.

Regards,
	kaz