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* [Bug ipa/66863] New: wrong code at -Os and above on x86_64-linux-gnu
@ 2015-07-14 3:11 su at cs dot ucdavis.edu
2015-07-14 7:56 ` [Bug tree-optimization/66863] [6 Regression] " glisse at gcc dot gnu.org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: su at cs dot ucdavis.edu @ 2015-07-14 3:11 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66863
Bug ID: 66863
Summary: wrong code at -Os and above on x86_64-linux-gnu
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: ipa
Assignee: unassigned at gcc dot gnu.org
Reporter: su at cs dot ucdavis.edu
Target Milestone: ---
The current gcc trunk mis-compiles the following code on x86_64-linux-gnu at
-Os and above in both 32-bit and 64-bit modes.
This is a regression from 5.1.x.
$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-unknown-linux-gnu/6.0.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-trunk/configure --prefix=/usr/local/gcc-trunk
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 6.0.0 20150713 (experimental) [trunk revision 225727] (GCC)
$
$ gcc-trunk -O1 small.c; ./a.out
$ gcc-5.1 -Os small.c; ./a.out
$
$ gcc-trunk -Os small.c
$ ./a.out
Floating point exception (core dumped)
$
---------------------------------
int a, b;
int
fn1 (int p1)
{
if (p1 < -2147483647)
return 0;
else
return 1;
}
int
fn2 (int p1, short p2)
{
return p2 ? p1 % p2 : 0;
}
int
main ()
{
b = fn2 (fn1 (a), a);
return 0;
}
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/66863] [6 Regression] wrong code at -Os and above on x86_64-linux-gnu
2015-07-14 3:11 [Bug ipa/66863] New: wrong code at -Os and above on x86_64-linux-gnu su at cs dot ucdavis.edu
@ 2015-07-14 7:56 ` glisse at gcc dot gnu.org
2015-07-14 8:15 ` rguenth at gcc dot gnu.org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: glisse at gcc dot gnu.org @ 2015-07-14 7:56 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66863
Marc Glisse <glisse at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2015-07-14
Component|ipa |tree-optimization
Target Milestone|--- |6.0
Summary|wrong code at -Os and above |[6 Regression] wrong code
|on x86_64-linux-gnu |at -Os and above on
| |x86_64-linux-gnu
Ever confirmed|0 |1
--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
In VRP:
_3 = (short int) a.0_2;
if (a.0_2 == -2147483648)
goto <bb 7>;
else
goto <bb 3>;
<bb 7>:
_10 = ASSERT_EXPR <_3, _3 == 0>;
goto <bb 4>;
<bb 3>:
_11 = ASSERT_EXPR <_3, _3 != 0>;
The == ASSERT_EXPR looks fine, but this last != ASSERT_EXPR is a bit
optimistic.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/66863] [6 Regression] wrong code at -Os and above on x86_64-linux-gnu
2015-07-14 3:11 [Bug ipa/66863] New: wrong code at -Os and above on x86_64-linux-gnu su at cs dot ucdavis.edu
2015-07-14 7:56 ` [Bug tree-optimization/66863] [6 Regression] " glisse at gcc dot gnu.org
@ 2015-07-14 8:15 ` rguenth at gcc dot gnu.org
2015-07-14 11:39 ` rguenth at gcc dot gnu.org
2015-07-14 11:39 ` rguenth at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: rguenth at gcc dot gnu.org @ 2015-07-14 8:15 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66863
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 #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Probably caused by
2015-06-30 Richard Biener <rguenther@suse.de>
* tree-vrp.c (register_edge_assert_for_2): Also register
asserts for dominating conversion results.
I'll have a look.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/66863] [6 Regression] wrong code at -Os and above on x86_64-linux-gnu
2015-07-14 3:11 [Bug ipa/66863] New: wrong code at -Os and above on x86_64-linux-gnu su at cs dot ucdavis.edu
` (2 preceding siblings ...)
2015-07-14 11:39 ` rguenth at gcc dot gnu.org
@ 2015-07-14 11:39 ` rguenth at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: rguenth at gcc dot gnu.org @ 2015-07-14 11:39 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66863
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Jul 14 11:39:14 2015
New Revision: 225768
URL: https://gcc.gnu.org/viewcvs?rev=225768&root=gcc&view=rev
Log:
2015-07-14 Richard Biener <rguenther@suse.de>
PR tree-optimization/66863
* tree-vrp.c (register_edge_assert_for_2): Properly restrict
what we record for conversion use stmt lhs inequalities.
* gcc.dg/torture/pr66863.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/torture/pr66863.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-vrp.c
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/66863] [6 Regression] wrong code at -Os and above on x86_64-linux-gnu
2015-07-14 3:11 [Bug ipa/66863] New: wrong code at -Os and above on x86_64-linux-gnu su at cs dot ucdavis.edu
2015-07-14 7:56 ` [Bug tree-optimization/66863] [6 Regression] " glisse at gcc dot gnu.org
2015-07-14 8:15 ` rguenth at gcc dot gnu.org
@ 2015-07-14 11:39 ` rguenth at gcc dot gnu.org
2015-07-14 11:39 ` rguenth at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: rguenth at gcc dot gnu.org @ 2015-07-14 11:39 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66863
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.
^ permalink raw reply [flat|nested] 5+ messages in thread
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2015-07-14 3:11 [Bug ipa/66863] New: wrong code at -Os and above on x86_64-linux-gnu su at cs dot ucdavis.edu
2015-07-14 7:56 ` [Bug tree-optimization/66863] [6 Regression] " glisse at gcc dot gnu.org
2015-07-14 8:15 ` rguenth at gcc dot gnu.org
2015-07-14 11:39 ` rguenth at gcc dot gnu.org
2015-07-14 11:39 ` rguenth at gcc dot gnu.org
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