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re PR middle-end/58956 (wrong code at -O1 and above (affecting gcc 4.6 to trunk))

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2013-11-19  Richard Biener  <rguenther@suse.de>

	PR middle-end/58956
	* tree-ssa-ter.c (find_replaceable_in_bb): Avoid forwarding
	loads into stmts that may clobber it.

	* gcc.dg/torture/pr58956.c: New testcase.

From-SVN: r205026
This commit is contained in:
Richard Biener 2013-11-19 13:28:35 +00:00 committed by Richard Biener
parent b4d05578ef
commit 7d07de0b2e
4 changed files with 44 additions and 4 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2013-11-19 Richard Biener <rguenther@suse.de>
PR middle-end/58956
* tree-ssa-ter.c (find_replaceable_in_bb): Avoid forwarding
loads into stmts that may clobber it.
2013-11-19 Bernd Schmidt <bernds@codesourcery.com>
* cgraphunit.c (symtab_terminator): New variable.

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2013-11-19 Richard Biener <rguenther@suse.de>
PR middle-end/58956
* gcc.dg/torture/pr58956.c: New testcase.
2013-11-19 Marek Polacek <polacek@redhat.com>
* c-c++-common/ubsan/null-1.c: New test.

30
gcc/testsuite/gcc.dg/torture/pr58956.c Normal file
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@ -0,0 +1,30 @@
/* { dg-do run } */
extern void abort (void);
struct S
{
int f0;
} a = {1}, b, g, *c = &b, **f = &c;
int *d, **e = &d, h;
struct S
foo ()
{
*e = &h;
if (!d)
__builtin_unreachable ();
*f = &g;
return a;
}
int
main ()
{
struct S *i = c;
*i = foo ();
if (b.f0 != 1)
abort ();
return 0;
}

7
gcc/tree-ssa-ter.c
View File

@ -602,8 +602,7 @@ find_replaceable_in_bb (temp_expr_table_p tab, basic_block bb)
/* If the stmt does a memory store and the replacement
is a load aliasing it avoid creating overlapping
assignments which we cannot expand correctly. */
if (gimple_vdef (stmt)
&& gimple_assign_single_p (stmt))
if (gimple_vdef (stmt))
{
gimple def_stmt = SSA_NAME_DEF_STMT (use);
while (is_gimple_assign (def_stmt)
@ -612,8 +611,8 @@ find_replaceable_in_bb (temp_expr_table_p tab, basic_block bb)
= SSA_NAME_DEF_STMT (gimple_assign_rhs1 (def_stmt));
if (gimple_vuse (def_stmt)
&& gimple_assign_single_p (def_stmt)
&& refs_may_alias_p (gimple_assign_lhs (stmt),
gimple_assign_rhs1 (def_stmt)))
&& stmt_may_clobber_ref_p (stmt,
gimple_assign_rhs1 (def_stmt)))
same_root_var = true;
}