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* [Bug middle-end/94539] New: gcc.dg/alias-14.c fails on gcc 10, succeeds on gcc 9, when turned into an execution test
@ 2020-04-09 12:37 ppalka at gcc dot gnu.org
2020-04-09 13:28 ` [Bug middle-end/94539] [10 Regression] " rguenth at gcc dot gnu.org
` (7 more replies)
0 siblings, 8 replies; 9+ messages in thread
From: ppalka at gcc dot gnu.org @ 2020-04-09 12:37 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94539
Bug ID: 94539
Summary: gcc.dg/alias-14.c fails on gcc 10, succeeds on gcc 9,
when turned into an execution test
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: ppalka at gcc dot gnu.org
Target Milestone: ---
The test gcc/testsuite/gcc.dg/alias-14.c fails when compiled and executed with
gcc 10, and succeeds when compiled and executed with gcc 9.
It was added in r6-1220 as a compile-only test, but seems like it should be an
execution test? Apologies in advance if this test is bogus as an execution
test.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/94539] [10 Regression] gcc.dg/alias-14.c fails on gcc 10, succeeds on gcc 9, when turned into an execution test
2020-04-09 12:37 [Bug middle-end/94539] New: gcc.dg/alias-14.c fails on gcc 10, succeeds on gcc 9, when turned into an execution test ppalka at gcc dot gnu.org
@ 2020-04-09 13:28 ` rguenth at gcc dot gnu.org
2020-04-09 14:02 ` hubicka at gcc dot gnu.org
` (6 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: rguenth at gcc dot gnu.org @ 2020-04-09 13:28 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94539
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Last reconfirmed| |2020-04-09
Target Milestone|--- |10.0
CC| |hubicka at gcc dot gnu.org,
| |rguenth at gcc dot gnu.org
Keywords| |wrong-code
Status|UNCONFIRMED |NEW
Summary|gcc.dg/alias-14.c fails on |[10 Regression]
|gcc 10, succeeds on gcc 9, |gcc.dg/alias-14.c fails on
|when turned into an |gcc 10, succeeds on gcc 9,
|execution test |when turned into an
| |execution test
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
On x86_64 we're failing
/* Again we should make void * in the structure conflict with any pointer.
*/
asm ("":"=r"(ptr):"0"(&c));
c.a=NULL;
*ptr=(float*)(size_t)1;
if (!c.a)
__builtin_abort ();
and at that point FRE1 already has
<bb 10> :
__asm__("" : "=r" ptr_23 : "0" &b);
*ptr_23 = 1B;
__asm__("" : "=r" ptr_26 : "0" &c);
c.a = 0B;
*ptr_26 = 1B;
__builtin_abort ();
I'll have a more detailed look.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/94539] [10 Regression] gcc.dg/alias-14.c fails on gcc 10, succeeds on gcc 9, when turned into an execution test
2020-04-09 12:37 [Bug middle-end/94539] New: gcc.dg/alias-14.c fails on gcc 10, succeeds on gcc 9, when turned into an execution test ppalka at gcc dot gnu.org
2020-04-09 13:28 ` [Bug middle-end/94539] [10 Regression] " rguenth at gcc dot gnu.org
@ 2020-04-09 14:02 ` hubicka at gcc dot gnu.org
2020-04-09 16:37 ` ppalka at gcc dot gnu.org
` (5 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: hubicka at gcc dot gnu.org @ 2020-04-09 14:02 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94539
--- Comment #2 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Hmm, the testcase is mine so I will take a look (and make it dg-do-run :)
Honza
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/94539] [10 Regression] gcc.dg/alias-14.c fails on gcc 10, succeeds on gcc 9, when turned into an execution test
2020-04-09 12:37 [Bug middle-end/94539] New: gcc.dg/alias-14.c fails on gcc 10, succeeds on gcc 9, when turned into an execution test ppalka at gcc dot gnu.org
2020-04-09 13:28 ` [Bug middle-end/94539] [10 Regression] " rguenth at gcc dot gnu.org
2020-04-09 14:02 ` hubicka at gcc dot gnu.org
@ 2020-04-09 16:37 ` ppalka at gcc dot gnu.org
2020-04-14 6:14 ` rguenth at gcc dot gnu.org
` (4 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: ppalka at gcc dot gnu.org @ 2020-04-09 16:37 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94539
--- Comment #3 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Bisection seems to be pointing to r10-779
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/94539] [10 Regression] gcc.dg/alias-14.c fails on gcc 10, succeeds on gcc 9, when turned into an execution test
2020-04-09 12:37 [Bug middle-end/94539] New: gcc.dg/alias-14.c fails on gcc 10, succeeds on gcc 9, when turned into an execution test ppalka at gcc dot gnu.org
` (2 preceding siblings ...)
2020-04-09 16:37 ` ppalka at gcc dot gnu.org
@ 2020-04-14 6:14 ` rguenth at gcc dot gnu.org
2020-04-14 6:14 ` rguenth at gcc dot gnu.org
` (3 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: rguenth at gcc dot gnu.org @ 2020-04-14 6:14 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94539
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Yeah, this commit has caused other issues in the past that are meanwhile fixed
though.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/94539] [10 Regression] gcc.dg/alias-14.c fails on gcc 10, succeeds on gcc 9, when turned into an execution test
2020-04-09 12:37 [Bug middle-end/94539] New: gcc.dg/alias-14.c fails on gcc 10, succeeds on gcc 9, when turned into an execution test ppalka at gcc dot gnu.org
` (3 preceding siblings ...)
2020-04-14 6:14 ` rguenth at gcc dot gnu.org
@ 2020-04-14 6:14 ` rguenth at gcc dot gnu.org
2020-04-14 11:15 ` rguenth at gcc dot gnu.org
` (2 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: rguenth at gcc dot gnu.org @ 2020-04-14 6:14 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94539
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P1
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/94539] [10 Regression] gcc.dg/alias-14.c fails on gcc 10, succeeds on gcc 9, when turned into an execution test
2020-04-09 12:37 [Bug middle-end/94539] New: gcc.dg/alias-14.c fails on gcc 10, succeeds on gcc 9, when turned into an execution test ppalka at gcc dot gnu.org
` (4 preceding siblings ...)
2020-04-14 6:14 ` rguenth at gcc dot gnu.org
@ 2020-04-14 11:15 ` rguenth at gcc dot gnu.org
2020-04-15 7:19 ` cvs-commit at gcc dot gnu.org
2020-04-15 7:20 ` rguenth at gcc dot gnu.org
7 siblings, 0 replies; 9+ messages in thread
From: rguenth at gcc dot gnu.org @ 2020-04-14 11:15 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94539
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Like
diff --git a/gcc/tree-ssa-alias.c b/gcc/tree-ssa-alias.c
index df9ba0de0d6..2850141303e 100644
--- a/gcc/tree-ssa-alias.c
+++ b/gcc/tree-ssa-alias.c
@@ -831,6 +831,15 @@ same_type_for_tbaa (tree type1, tree type2)
&& TREE_CODE (type2) == ARRAY_TYPE)
return -1;
+ /* void * is compatible with all other pointers. */
+ if (POINTER_TYPE_P (type1)
+ && POINTER_TYPE_P (type2)
+ && (TREE_CODE (TREE_TYPE (type1)) == VOID_TYPE
+ || TYPE_STRUCTURAL_EQUALITY_P (TREE_TYPE (type1))
+ || TREE_CODE (TREE_TYPE (type2)) == VOID_TYPE
+ || TYPE_STRUCTURAL_EQUALITY_P (TREE_TYPE (type2))))
+ return -1;
+
/* ??? In Ada, an lvalue of an unconstrained type can be used to access an
object of one of its constrained subtypes, e.g. when a function with an
unconstrained parameter passed by reference is called on an object and
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/94539] [10 Regression] gcc.dg/alias-14.c fails on gcc 10, succeeds on gcc 9, when turned into an execution test
2020-04-09 12:37 [Bug middle-end/94539] New: gcc.dg/alias-14.c fails on gcc 10, succeeds on gcc 9, when turned into an execution test ppalka at gcc dot gnu.org
` (5 preceding siblings ...)
2020-04-14 11:15 ` rguenth at gcc dot gnu.org
@ 2020-04-15 7:19 ` cvs-commit at gcc dot gnu.org
2020-04-15 7:20 ` rguenth at gcc dot gnu.org
7 siblings, 0 replies; 9+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2020-04-15 7:19 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94539
--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:
https://gcc.gnu.org/g:e71b408aa242ffc76ffd19ebcdbd40279a1d9349
commit r10-7730-ge71b408aa242ffc76ffd19ebcdbd40279a1d9349
Author: Richard Biener <rguenther@suse.de>
Date: Tue Apr 14 13:16:25 2020 +0200
middle-end/94539 - void * aliases every other pointer
This makes same_type_for_tbaa_p conservative in the same way
get_alias_set is about void * which we allow to alias all other
pointers.
2020-04-15 Richard Biener <rguenther@suse.de>
PR middle-end/94539
* tree-ssa-alias.c (same_type_for_tbaa): Defer to
alias_sets_conflict_p for pointers.
* gcc.dg/alias-14.c: Make dg-do run.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/94539] [10 Regression] gcc.dg/alias-14.c fails on gcc 10, succeeds on gcc 9, when turned into an execution test
2020-04-09 12:37 [Bug middle-end/94539] New: gcc.dg/alias-14.c fails on gcc 10, succeeds on gcc 9, when turned into an execution test ppalka at gcc dot gnu.org
` (6 preceding siblings ...)
2020-04-15 7:19 ` cvs-commit at gcc dot gnu.org
@ 2020-04-15 7:20 ` rguenth at gcc dot gnu.org
7 siblings, 0 replies; 9+ messages in thread
From: rguenth at gcc dot gnu.org @ 2020-04-15 7:20 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94539
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.
^ permalink raw reply [flat|nested] 9+ messages in thread
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2020-04-09 12:37 [Bug middle-end/94539] New: gcc.dg/alias-14.c fails on gcc 10, succeeds on gcc 9, when turned into an execution test ppalka at gcc dot gnu.org
2020-04-09 13:28 ` [Bug middle-end/94539] [10 Regression] " rguenth at gcc dot gnu.org
2020-04-09 14:02 ` hubicka at gcc dot gnu.org
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