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tree-optimization/117333 - ICE with NULL access size DR

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dr_may_alias_p ICEs when TYPE_SIZE of DR->ref is NULL but this is
valid IL when the access size of an aggregate copy can be infered
from the RHS.

	PR tree-optimization/117333
	* tree-data-ref.cc (dr_may_alias_p): Guard against NULL
	access size.

	* gcc.dg/torture/pr117333.c: New testcase.
This commit is contained in:
Richard Biener 2024-10-29 09:42:12 +01:00 committed by Richard Biener
parent 5e247ac0c2
commit 0e99b22aa6
2 changed files with 31 additions and 0 deletions
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29
gcc/testsuite/gcc.dg/torture/pr117333.c Normal file
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@ -0,0 +1,29 @@
/* { dg-do compile } */
struct s
{
unsigned long ul;
int i;
char ac[];
};
const struct s gs = { 3, -4, "abcdef" };
void copy_s(struct s*d, const struct s*s)
{
*d = *s;
}
unsigned test(struct s*ps, _Bool direct)
{
if(direct)
*ps = gs;
else
copy_s(ps, &gs);
return sizeof(*ps);
}
unsigned size(void)
{
return sizeof(gs);
}

2
gcc/tree-data-ref.cc
View File

@ -3004,6 +3004,8 @@ dr_may_alias_p (const struct data_reference *a, const struct data_reference *b,
&& DR_BASE_ADDRESS (b)
&& operand_equal_p (DR_BASE_ADDRESS (a), DR_BASE_ADDRESS (b))
&& operand_equal_p (DR_OFFSET (a), DR_OFFSET (b))
&& tree_size_a
&& tree_size_b
&& poly_int_tree_p (tree_size_a)
&& poly_int_tree_p (tree_size_b)
&& !ranges_maybe_overlap_p (wi::to_poly_widest (DR_INIT (a)),