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ICE: SEGFAULT in mem rtx - GCC-4.5.1
- From: vikram1729 <vsp1729 at gmail dot com>
- To: gcc-help at gcc dot gnu dot org
- Date: Sun, 22 Nov 2015 23:54:24 -0700 (MST)
- Subject: ICE: SEGFAULT in mem rtx - GCC-4.5.1
- Authentication-results: sourceware.org; auth=none
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?
Thanks & Regards
-VSP
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