[PATCH] RX: Incorrect output for displacement of subtruct expression

[Oleg Endo]

On Fri, 2024-12-27 at 23:11 +0900, Yoshinori Sato wrote:
> 
> I am trying to get FDPIC support in RX.
> gcc, which supports this FDPIC, generated the following code for a switch
> statement:
> 
> 1:      mvfc    pc, r3
> 	shll    #2, r14
>         add     r3, r14
>         mov.L   .L282 - 1b[r14], r14
> 
> 1:      bra     r14
>         .balign 4
> .L282:
>         .long .L284 - 1b
>         .long .L280 - 1b
>         .long .L280 - 1b
> 
> I investigated why this code wasn't working as expected and discovered that it
> was due to this bug.
> This kind of code is not output by the release version of gcc, and even when
> written in assembler, it is not written in this way, so I don't think anyone
> noticed the bug.

Very nice detective work.  Thanks!

Best regards,
Oleg Endo