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tree-optimization/103987 - guard DSE modref query

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This adds a missing guard for a pointer to the DSE modref query,
otherwise we can end up invoking APIs desired to only work on
pointers on non-pointers when there are mismatches between declared
and actual arguments of functions in the program.

2022-01-18  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/103987
	* tree-ssa-dse.cc (dse_optimize_call): Properly guard modref
	query with a pointer check.

	* gcc.dg/torture/pr103987.c: New testcase.
This commit is contained in:
Richard Biener 2022-01-18 13:26:22 +01:00
parent 4288b57aff
commit 3ed40db0f1
2 changed files with 18 additions and 2 deletions
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13
gcc/testsuite/gcc.dg/torture/pr103987.c Normal file
View File

@ -0,0 +1,13 @@
/* { dg-do compile } */
void foo();
void bar(int i)
{
foo (i);
}
void foo(int *p)
{
*p = 0;
}

7
gcc/tree-ssa-dse.cc
View File

@ -43,6 +43,7 @@ along with GCC; see the file COPYING3. If not see
#include "cgraph.h"
#include "ipa-modref-tree.h"
#include "ipa-modref.h"
#include "target.h"
/* This file implements dead store elimination.
@ -1190,10 +1191,12 @@ dse_optimize_call (gimple_stmt_iterator *gsi, sbitmap live_bytes)
{
tree arg = access_node.get_call_arg (stmt);
if (!arg)
if (!arg || !POINTER_TYPE_P (TREE_TYPE (arg)))
return false;
if (integer_zerop (arg) && flag_delete_null_pointer_checks)
if (integer_zerop (arg)
&& !targetm.addr_space.zero_address_valid
(TYPE_ADDR_SPACE (TREE_TYPE (arg))))
continue;
ao_ref ref;