Le vendredi 11 avril 2008 à 11:14 -0700, Jim Wilson a écrit :
> Stelian Pop wrote:
> > #define PREFERRED_RELOAD_CLASS(X, CLASS) \
> > ((CONSTANT_P(X)) ? EIGHT_REGS : \
> > (MEM_P(X)) ? EVEN_REGS : CLASS)
> >
> > #define PREFERRED_OUTPUT_RELOAD_CLASS(X, CLASS) \
> > ((CONSTANT_P(X)) ? EIGHT_REGS : \
> > (MEM_P(X)) ? EVEN_REGS : CLASS)
>
> I think most of your trouble is here. Suppose we are trying to reload a
> constant into an even-reg. We call PREFERRED_RELOAD_CLASS, which says
> to use eight_regs instead, and you get a fatal_insn error because you
> didn't get the even-reg that the instruction needed.
[...]
I've tried the suggestion above and it did indeed help. However, I had a
few additional issues:
- the stack pointer and the frame pointer MUST be placed into an
even-reg, or else reload will generate (mem (plus (reg) (const))) insn
(when eliminating the pointers).
- I had to add a PLUS case in PREFERRED_RELOAD_CLASS() or else reload
kept generating incorrect insn (putting constants into EVEN_REGS for
example). I'm not sure this is correct or if it hides something else...
#define STACK_POINTER_REGNUM 30
#define FRAME_POINTER_REGNUM 28
#define PREFERRED_RELOAD_CLASS(X, CLASS) ardac_preferred_reload_class(X, CLASS)
#define PREFERRED_OUTPUT_RELOAD_CLASS(X, CLASS) ardac_preferred_reload_class(X,
CLASS)
enum reg_class
ardac_preferred_reload_class(rtx x, enum reg_class class)
{
if (CONSTANT_P(x)) {
switch (class) {
case NO_REGS:
case STACK_REGS:
return NO_REGS;
case EVEN_REGS:
case EIGHTEVEN_REGS:
return EIGHTEVEN_REGS;
case EIGHT_REGS:
case GENERAL_REGS:
return EIGHT_REGS;
default:
gcc_unreachable ();
}
}
else if (MEM_P(x)) {
switch (class) {
case NO_REGS:
case STACK_REGS:
return NO_REGS;
case EIGHT_REGS:
case EIGHTEVEN_REGS:
return EIGHTEVEN_REGS;
case EVEN_REGS:
case GENERAL_REGS:
return EVEN_REGS;
default:
gcc_unreachable ();
}
}
else {
if (GET_CODE (x) == PLUS
&& GET_CODE (XEXP (x, 0)) == REG
&& GET_CODE (XEXP (x, 1)) == CONST_INT) {
return EIGHTEVEN_REGS;
}
return class;
}
}
Now it compiler 100+ files from libgcc without error so I guess the
register assignment problem is solved. It now fails later:
/home/tiniou/LTD/LTD/aRDAC/wip/src/gcc-4.3.0/libgcc/../gcc/unwind-dw2-fde.c: In
function ‘frame_heapsort’:
/home/tiniou/LTD/LTD/aRDAC/wip/src/gcc-4.3.0/libgcc/../gcc/unwind-dw2-fde.c:521:
internal compiler error: in expand_call, at calls.c:3149
I haven't investigated why yet, but this is probably not related to the above.
Thanks,
--
Stelian Pop <[EMAIL PROTECTED]>
