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re PR tree-optimization/56210 (invalid -Warray-bounds warning) 

2013-03-18  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/56210
	* tree-ssa-structalias.c (find_func_aliases_for_builtin_call):
	Handle string / character search functions.
	* tree-ssa-alias.c (ref_maybe_used_by_call_p_1): Likewise.

From-SVN: r196777
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Richard Biener 2013-03-18 10:33:11 +00:00 committed by Richard Biener
parent 31348d52c0
commit 92608d0edb
3 changed files with 67 additions and 0 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2013-03-18 Richard Biener <rguenther@suse.de>
PR tree-optimization/56210
* tree-ssa-structalias.c (find_func_aliases_for_builtin_call):
Handle string / character search functions.
* tree-ssa-alias.c (ref_maybe_used_by_call_p_1): Likewise.
2013-03-18 Richard Biener <rguenther@suse.de> 2013-03-18 Richard Biener <rguenther@suse.de>
PR middle-end/56483 PR middle-end/56483

37
gcc/tree-ssa-alias.c
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@ -1314,6 +1314,43 @@ ref_maybe_used_by_call_p_1 (gimple call, ao_ref *ref)
size); size);
return refs_may_alias_p_1 (&dref, ref, false); return refs_may_alias_p_1 (&dref, ref, false);
} }
/* These read memory pointed to by the first argument. */
case BUILT_IN_INDEX:
case BUILT_IN_STRCHR:
case BUILT_IN_STRRCHR:
{
ao_ref dref;
ao_ref_init_from_ptr_and_size (&dref,
gimple_call_arg (call, 0),
NULL_TREE);
return refs_may_alias_p_1 (&dref, ref, false);
}
/* These read memory pointed to by the first argument with size
in the third argument. */
case BUILT_IN_MEMCHR:
{
ao_ref dref;
ao_ref_init_from_ptr_and_size (&dref,
gimple_call_arg (call, 0),
gimple_call_arg (call, 2));
return refs_may_alias_p_1 (&dref, ref, false);
}
/* These read memory pointed to by the first and second arguments. */
case BUILT_IN_STRSTR:
case BUILT_IN_STRPBRK:
{
ao_ref dref;
ao_ref_init_from_ptr_and_size (&dref,
gimple_call_arg (call, 0),
NULL_TREE);
if (refs_may_alias_p_1 (&dref, ref, false))
return true;
ao_ref_init_from_ptr_and_size (&dref,
gimple_call_arg (call, 1),
NULL_TREE);
return refs_may_alias_p_1 (&dref, ref, false);
}
/* The following builtins do not read from memory. */ /* The following builtins do not read from memory. */
case BUILT_IN_FREE: case BUILT_IN_FREE:
case BUILT_IN_MALLOC: case BUILT_IN_MALLOC:

23
gcc/tree-ssa-structalias.c
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@ -4196,6 +4196,29 @@ find_func_aliases_for_builtin_call (gimple t)
return true; return true;
} }
break; break;
/* String / character search functions return a pointer into the
source string or NULL. */
case BUILT_IN_INDEX:
case BUILT_IN_STRCHR:
case BUILT_IN_STRRCHR:
case BUILT_IN_MEMCHR:
case BUILT_IN_STRSTR:
case BUILT_IN_STRPBRK:
if (gimple_call_lhs (t))
{
tree src = gimple_call_arg (t, 0);
get_constraint_for_ptr_offset (src, NULL_TREE, &rhsc);
constraint_expr nul;
nul.var = nothing_id;
nul.offset = 0;
nul.type = ADDRESSOF;
rhsc.safe_push (nul);
get_constraint_for (gimple_call_lhs (t), &lhsc);
process_all_all_constraints (lhsc, rhsc);
lhsc.release();
rhsc.release();
}
return true;
/* Trampolines are special - they set up passing the static /* Trampolines are special - they set up passing the static
frame. */ frame. */
case BUILT_IN_INIT_TRAMPOLINE: case BUILT_IN_INIT_TRAMPOLINE: