On 11/22/2015 11:54 PM, vikram1729 wrote:
Hi
I am building gcc-4.5.1 cross compiler. I am getting SEGFAULT ICE at
simplify-rtx.c:167, i.e. at this function
/* If X is a MEM referencing the constant pool, return the real value.
Otherwise return X. */
rtx
avoid_constant_pool_reference (rtx x)
{
rtx c, tmp, addr;
....
....
--> addr = targetm.delegitimize_address (addr); //SEGFAULT here
/* Split the address into a base and integer offset. */
if (GET_CODE (addr) == CONST
....
}
When debugging, call debug_rtx(x) gives this pattern:
(mem/c/i:SI (plus:SI (reg/f:SI 129 virtual-stack-vars)
(const_int -8 [0xfffffff8])) [0 __ul+0 S4 A32])
To solve it, I tried to implement my own delegitimize function:
static rtx
target_delegitimize_address (rtx orig_x)
{
//rtx x = orig_x;
rtx x = delegitimize_mem_from_attrs (orig_x);
if (GET_CODE (x) != MEM)
return XEXP(x, 0);
x = XEXP (x, 0);
if (GET_CODE (x) == PLUS
&& GET_CODE (XEXP (x, 1)) == CONST_INT
&& GET_CODE (XEXP (x, 0)) == REG)
//DON'T KNOW WHAT TO WRITE HERE. Tried this but failed: return XVECEXP
(XEXP(x, 1), 0, 0);
return orig_x;
}
Is it a backend problem?
This is most definitely a problem with your target files.
You certainly don't want to be returning XVECEXP (anything) since you
don't have a vector type.
In fact, for (plus (virtual-stack-vars) (const_int)), I'd think you'd
want to return the address as-is.
The delegitimize_address look, to the best of my knowledge, is primarily
supposed to be dealing with embedded UNSPECs or other obfuscated RTL for
PIC support and the like. A simple base+offset address shouldn't need
delegitimization.
jeff
