Re: Reloading failes

[Jim Wilson <wilson at tuliptree dot org>]

andersa@tiscali.no wrote:
> (set (reg:SI 2 r3)
>      (mem/s:SI (plus:SI (mem:SI (plus:SI (reg/f:SI 6 r7)
>                                          (const_int -16)))
>                         (const_int 4))))

This looks like a REG_OK_STRICT bug in your port.

Normally, pseudo registers can be treated just like a hard register. 
However, during reload, any pseudo register remaining will be converted 
to a stack slot, so they must be treated like a MEM instead of like a 
REG.  This is handled via REG_OK_STRICT.  When REG_OK_STRICT is true, we 
don't accept pseudo registers.  When REG_OK_STRICT is false, we do 
accept pseudo registers.

This is handled for you if you things like GO_IF_LEGITIMATE_ADDRESS are 
macros in the tm.h file.  However, if this calls a function in the 
target .c file, then you need to manually pass the value of 
REG_OK_STRICT to the function in the target .c file, and then check the 
value in that function.  There are many ports that do this already.  I 
suggest you look at one of them to see how this is done.

Jim