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From: Balaji V. Iyer<bviyer@n...>
Date: Sun Dec 9 09:55:36 CET 2007
Subject: [openrisc] Help with another constraint
Hello Everyone,
I am trying to partition register files in GCC port of Opencores
(OPENRISC 1000). It is currently failing the following constraint in
negdi2

(insn 15 13 16 (set (mem:SI (plus:SI (reg/f:SI 2 r2)
(const_int -28 [0xffffffe4])) [0 D.1256+0 S4 A32])
(neg:SI (reg:SI 3 r3 [orig:80 D.1255 ] [80]))) 38 {negsi2} (nil)
(nil))
../../gcc-4.0.2/gcc/libgcc2.c:72: internal compiler error: in
final_scan_insn, at final.c:2439
Please submit a full bug report,


REGISTER R2 is the frame pointer!!

I think this is because of the way I am handling the frame
pointer...This is how I do it in the or32.h file



#define FRAME_POINTER_REGNUM 2
#define FRAME_POINTER_REQUIRED 0

#define INITIAL_FRAME_POINTER_OFFSET(DEPTH)
\
{ int regno;
\
int offset = 0;
\
for( regno=0; regno < FIRST_PSEUDO_REGISTER; regno++ )
\
if( regs_ever_live[regno] && !call_used_regs[regno] )
\
offset += 4;
\
(DEPTH) = (!current_function_is_leaf || regs_ever_live[LINK_REGNUM] ?
4 : 0) + \
(frame_pointer_needed ? 4 : 0)
+ \
offset
+ \
OR32_ALIGN(current_function_outgoing_args_size,4)
+ \
OR32_ALIGN(get_frame_size(),4);
\
}


#define FIX_FRAME_POINTER_ADDRESS(ADDR,DEPTH) \
{ int offset = -1;
\
rtx regs = stack_pointer_rtx;
\
if (ADDR == frame_pointer_rtx)
\
offset = 0;
\
else if (GET_CODE (ADDR) == PLUS && XEXP (ADDR, 1) ==
frame_pointer_rtx \
&& GET_CODE (XEXP (ADDR, 0)) == CONST_INT)
\
offset = INTVAL (XEXP (ADDR, 0));
\
else if (GET_CODE (ADDR) == PLUS && XEXP (ADDR, 0) ==
frame_pointer_rtx \
&& GET_CODE (XEXP (ADDR, 1)) == CONST_INT)
\
offset = INTVAL (XEXP (ADDR, 1));
\
else if (GET_CODE (ADDR) == PLUS && XEXP (ADDR, 0) ==
frame_pointer_rtx) \
{ rtx other_reg = XEXP (ADDR, 1);
\
offset = 0;
\
regs = gen_rtx (PLUS, Pmode, stack_pointer_rtx, other_reg); }
\
else if (GET_CODE (ADDR) == PLUS && XEXP (ADDR, 1) ==
frame_pointer_rtx) \
{ rtx other_reg = XEXP (ADDR, 0);
\
offset = 0;
\
regs = gen_rtx (PLUS, Pmode, stack_pointer_rtx, other_reg); }
\
if (offset >= 0)
\
{ int regno;
\
extern char call_used_regs[];
\
offset += 4; /* I don't know why??? */
\
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
\
if (regs_ever_live[regno] && ! call_used_regs[regno])
\
offset += 4;
\
ADDR = plus_constant (regs, offset + (DEPTH)); } } What am I doing wrong?? ANy help is highly highly appreciated! Yours Sincerely, Balaji V. Iyer. -- Balaji V. Iyer PhD Student, Center for Efficient, Scalable and Reliable Computing, Department of Electrical and Computer Engineering, North Carolina State University.