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* [Bug middle-end/40692] New: [4.5 Regression] Endless recursion between fold_ternary and fold_cond_expr_with_comparison
@ 2009-07-08 22:09 jakub at gcc dot gnu dot org
2009-07-08 23:10 ` [Bug middle-end/40692] " jakub at gcc dot gnu dot org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: jakub at gcc dot gnu dot org @ 2009-07-08 22:09 UTC (permalink / raw)
To: gcc-bugs
Linux kernel, in particularly xen-blkfront.c, doesn't compile with GCC trunk.
4.5.0 20090625 was still fine, 4.5.0 20090630 is already wrong.
Simplified testcase:
#define M1(x) (((x) & 0x00000002) ? 0x2 : ((x) & 0x1))
#define M2(x) (((x) & 0x0000000c) ? M1 ((x) >> 2) << 2 : M1 (x))
struct A { char f[1]; };
char a[M2 (4096UL - (long)&((struct A *) 16)->f)];
--
Summary: [4.5 Regression] Endless recursion between fold_ternary
and fold_cond_expr_with_comparison
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
AssignedTo: jakub at gcc dot gnu dot org
ReportedBy: jakub at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40692
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/40692] [4.5 Regression] Endless recursion between fold_ternary and fold_cond_expr_with_comparison
2009-07-08 22:09 [Bug middle-end/40692] New: [4.5 Regression] Endless recursion between fold_ternary and fold_cond_expr_with_comparison jakub at gcc dot gnu dot org
@ 2009-07-08 23:10 ` jakub at gcc dot gnu dot org
2009-07-09 11:19 ` jakub at gcc dot gnu dot org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: jakub at gcc dot gnu dot org @ 2009-07-08 23:10 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from jakub at gcc dot gnu dot org 2009-07-08 23:09 -------
Caused by r149060. Will debug tomorrow.
Alternative testcase that doesn't warn about VLA at file scope:
#define M1(x) (((x) & 0x00000002) ? 0x2 : ((x) & 0x1))
#define M2(x) (((x) & 0x0000000c) ? M1 ((x) >> 2) << 2 : M1 (x))
struct A { char f[1]; };
int foo (void)
{
return M2 (4096UL - (long)&((struct A *) 16UL)->f);
}
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40692
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/40692] [4.5 Regression] Endless recursion between fold_ternary and fold_cond_expr_with_comparison
2009-07-08 22:09 [Bug middle-end/40692] New: [4.5 Regression] Endless recursion between fold_ternary and fold_cond_expr_with_comparison jakub at gcc dot gnu dot org
2009-07-08 23:10 ` [Bug middle-end/40692] " jakub at gcc dot gnu dot org
@ 2009-07-09 11:19 ` jakub at gcc dot gnu dot org
2009-07-09 11:32 ` jakub at gcc dot gnu dot org
2009-07-23 17:52 ` hjl at gcc dot gnu dot org
3 siblings, 0 replies; 5+ messages in thread
From: jakub at gcc dot gnu dot org @ 2009-07-09 11:19 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from jakub at gcc dot gnu dot org 2009-07-09 11:19 -------
Subject: Bug 40692
Author: jakub
Date: Thu Jul 9 11:19:22 2009
New Revision: 149418
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=149418
Log:
PR middle-end/40692
* fold-const.c (fold_cond_expr_with_comparison): Don't replace
arg1 with arg01 if arg1 is already INTEGER_CST.
* gcc.c-torture/compile/pr40692.c: New test.
Added:
trunk/gcc/testsuite/gcc.c-torture/compile/pr40692.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/fold-const.c
trunk/gcc/testsuite/ChangeLog
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40692
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/40692] [4.5 Regression] Endless recursion between fold_ternary and fold_cond_expr_with_comparison
2009-07-08 22:09 [Bug middle-end/40692] New: [4.5 Regression] Endless recursion between fold_ternary and fold_cond_expr_with_comparison jakub at gcc dot gnu dot org
2009-07-08 23:10 ` [Bug middle-end/40692] " jakub at gcc dot gnu dot org
2009-07-09 11:19 ` jakub at gcc dot gnu dot org
@ 2009-07-09 11:32 ` jakub at gcc dot gnu dot org
2009-07-23 17:52 ` hjl at gcc dot gnu dot org
3 siblings, 0 replies; 5+ messages in thread
From: jakub at gcc dot gnu dot org @ 2009-07-09 11:32 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from jakub at gcc dot gnu dot org 2009-07-09 11:32 -------
Fixed.
--
jakub at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40692
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/40692] [4.5 Regression] Endless recursion between fold_ternary and fold_cond_expr_with_comparison
2009-07-08 22:09 [Bug middle-end/40692] New: [4.5 Regression] Endless recursion between fold_ternary and fold_cond_expr_with_comparison jakub at gcc dot gnu dot org
` (2 preceding siblings ...)
2009-07-09 11:32 ` jakub at gcc dot gnu dot org
@ 2009-07-23 17:52 ` hjl at gcc dot gnu dot org
3 siblings, 0 replies; 5+ messages in thread
From: hjl at gcc dot gnu dot org @ 2009-07-23 17:52 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from hjl at gcc dot gnu dot org 2009-07-23 17:51 -------
Subject: Bug 40692
Author: hjl
Date: Thu Jul 23 17:50:56 2009
New Revision: 150020
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=150020
Log:
2009-07-23 H.J. Lu <hongjiu.lu@intel.com>
Backport from mainline:
2009-07-22 Richard Guenther <rguenther@suse.de>
PR c++/40799
* g++.dg/lookup/using21.C: New testcase.
2009-07-19 Jan Hubicka <jh@suse.cz>
PR tree-optimization/40676
* gcc.c-torture/compile/pr40676.c: New testcase.
2009-07-15 Richard Guenther <rguenther@suse.de>
PR middle-end/40753
* gcc.c-torture/compile/pr40753.c: New testcase.
2009-07-14 Dodji Seketeli <dodji@redhat.com>
PR debug/40705
* g++.dg/debug/dwarf2/typedef1.C: New test.
PR c++/40357
* g++.dg/other/typedef3.C: New test.
2009-07-10 Richard Guenther <rguenther@suse.de>
PR tree-optimization/40496
* g++.dg/opt/pr40496.C: New testcase.
2009-07-09 Jakub Jelinek <jakub@redhat.com>
PR middle-end/40692
* gcc.c-torture/compile/pr40692.c: New test.
2009-07-08 Jerry DeLisle <jvdelisle@gcc.gnu.org>
PR libfortran/40330
PR libfortran/40662
* gfortran.dg/fmt_cache_1.f: New test.
Added:
branches/gcc-4_4-branch/gcc/testsuite/g++.dg/debug/dwarf2/typedef1.C
- copied unchanged from r150018,
trunk/gcc/testsuite/g++.dg/debug/dwarf2/typedef1.C
branches/gcc-4_4-branch/gcc/testsuite/g++.dg/lookup/using21.C
- copied unchanged from r150018,
trunk/gcc/testsuite/g++.dg/lookup/using21.C
branches/gcc-4_4-branch/gcc/testsuite/g++.dg/opt/pr40496.C
- copied unchanged from r150018, trunk/gcc/testsuite/g++.dg/opt/pr40496.C
branches/gcc-4_4-branch/gcc/testsuite/g++.dg/other/typedef3.C
- copied unchanged from r150018,
trunk/gcc/testsuite/g++.dg/other/typedef3.C
branches/gcc-4_4-branch/gcc/testsuite/gcc.c-torture/compile/pr40676.c
- copied unchanged from r150018,
trunk/gcc/testsuite/gcc.c-torture/compile/pr40676.c
branches/gcc-4_4-branch/gcc/testsuite/gcc.c-torture/compile/pr40692.c
- copied unchanged from r150018,
trunk/gcc/testsuite/gcc.c-torture/compile/pr40692.c
branches/gcc-4_4-branch/gcc/testsuite/gcc.c-torture/compile/pr40753.c
- copied unchanged from r150018,
trunk/gcc/testsuite/gcc.c-torture/compile/pr40753.c
branches/gcc-4_4-branch/gcc/testsuite/gfortran.dg/fmt_cache_1.f
- copied unchanged from r150018,
trunk/gcc/testsuite/gfortran.dg/fmt_cache_1.f
Modified:
branches/gcc-4_4-branch/gcc/testsuite/ChangeLog
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40692
^ permalink raw reply [flat|nested] 5+ messages in thread
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2009-07-08 22:09 [Bug middle-end/40692] New: [4.5 Regression] Endless recursion between fold_ternary and fold_cond_expr_with_comparison jakub at gcc dot gnu dot org
2009-07-08 23:10 ` [Bug middle-end/40692] " jakub at gcc dot gnu dot org
2009-07-09 11:19 ` jakub at gcc dot gnu dot org
2009-07-09 11:32 ` jakub at gcc dot gnu dot org
2009-07-23 17:52 ` hjl at gcc dot gnu dot org
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