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* [Bug c/95049] New: GCC never terminates with trivial input program
@ 2020-05-11 9:00 luis at luismarques dot eu
2020-05-11 9:36 ` [Bug tree-optimization/95049] " rguenth at gcc dot gnu.org
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: luis at luismarques dot eu @ 2020-05-11 9:00 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95049
Bug ID: 95049
Summary: GCC never terminates with trivial input program
Product: gcc
Version: 9.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: luis at luismarques dot eu
Target Milestone: ---
Since at least GCC 9.1 the following trivial program results in an infinite
compilation time when compiling with -O2 or higher. This continues to happen
with GCC trunk as of the date of filing this bug.
void a() {
for (int b; b; b = !b) {
}
}
^ permalink raw reply [flat|nested] 7+ messages in thread* [Bug tree-optimization/95049] GCC never terminates with trivial input program 2020-05-11 9:00 [Bug c/95049] New: GCC never terminates with trivial input program luis at luismarques dot eu @ 2020-05-11 9:36 ` rguenth at gcc dot gnu.org 2020-05-11 11:44 ` [Bug tree-optimization/95049] [9/10/11 Regression] " rguenth at gcc dot gnu.org ` (4 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: rguenth at gcc dot gnu.org @ 2020-05-11 9:36 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95049 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Component|c |tree-optimization Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org Ever confirmed|0 |1 Last reconfirmed| |2020-05-11 Status|UNCONFIRMED |ASSIGNED --- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> --- Mine. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/95049] [9/10/11 Regression] GCC never terminates with trivial input program 2020-05-11 9:00 [Bug c/95049] New: GCC never terminates with trivial input program luis at luismarques dot eu 2020-05-11 9:36 ` [Bug tree-optimization/95049] " rguenth at gcc dot gnu.org @ 2020-05-11 11:44 ` rguenth at gcc dot gnu.org 2020-05-11 15:53 ` cvs-commit at gcc dot gnu.org ` (3 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: rguenth at gcc dot gnu.org @ 2020-05-11 11:44 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95049 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Summary|GCC never terminates with |[9/10/11 Regression] GCC |trivial input program |never terminates with | |trivial input program Target Milestone|--- |9.4 Priority|P3 |P2 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/95049] [9/10/11 Regression] GCC never terminates with trivial input program 2020-05-11 9:00 [Bug c/95049] New: GCC never terminates with trivial input program luis at luismarques dot eu 2020-05-11 9:36 ` [Bug tree-optimization/95049] " rguenth at gcc dot gnu.org 2020-05-11 11:44 ` [Bug tree-optimization/95049] [9/10/11 Regression] " rguenth at gcc dot gnu.org @ 2020-05-11 15:53 ` cvs-commit at gcc dot gnu.org 2020-06-23 11:06 ` [Bug tree-optimization/95049] [9/10 " cvs-commit at gcc dot gnu.org ` (2 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: cvs-commit at gcc dot gnu.org @ 2020-05-11 15:53 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95049 --- Comment #2 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:84f4954c38228e4cb3e6f0b5471883e6c2523631 commit r11-277-g84f4954c38228e4cb3e6f0b5471883e6c2523631 Author: Richard Biener <rguenther@suse.de> Date: Mon May 11 13:40:37 2020 +0200 tree-optimization/95049 - fix not terminating RPO VN iteration This rejects lattice changes from one constant to another. 2020-05-11 Richard Biener <rguenther@suse.de> PR tree-optimization/95049 * tree-ssa-sccvn.c (set_ssa_val_to): Reject lattice transition between different constants. * gcc.dg/torture/pr95049.c: New testcase. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/95049] [9/10 Regression] GCC never terminates with trivial input program 2020-05-11 9:00 [Bug c/95049] New: GCC never terminates with trivial input program luis at luismarques dot eu ` (2 preceding siblings ...) 2020-05-11 15:53 ` cvs-commit at gcc dot gnu.org @ 2020-06-23 11:06 ` cvs-commit at gcc dot gnu.org 2020-09-11 10:38 ` [Bug tree-optimization/95049] [9 " cvs-commit at gcc dot gnu.org 2020-09-11 10:39 ` rguenth at gcc dot gnu.org 5 siblings, 0 replies; 7+ messages in thread From: cvs-commit at gcc dot gnu.org @ 2020-06-23 11:06 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95049 --- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-10 branch has been updated by Richard Biener <rguenth@gcc.gnu.org>: https://gcc.gnu.org/g:80416aac46779533476425424e06753bac67e148 commit r10-8348-g80416aac46779533476425424e06753bac67e148 Author: Richard Biener <rguenther@suse.de> Date: Mon May 11 13:40:37 2020 +0200 tree-optimization/95049 - fix not terminating RPO VN iteration This rejects lattice changes from one constant to another. 2020-05-11 Richard Biener <rguenther@suse.de> PR tree-optimization/95049 * tree-ssa-sccvn.c (set_ssa_val_to): Reject lattice transition between different constants. * gcc.dg/torture/pr95049.c: New testcase. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/95049] [9 Regression] GCC never terminates with trivial input program 2020-05-11 9:00 [Bug c/95049] New: GCC never terminates with trivial input program luis at luismarques dot eu ` (3 preceding siblings ...) 2020-06-23 11:06 ` [Bug tree-optimization/95049] [9/10 " cvs-commit at gcc dot gnu.org @ 2020-09-11 10:38 ` cvs-commit at gcc dot gnu.org 2020-09-11 10:39 ` rguenth at gcc dot gnu.org 5 siblings, 0 replies; 7+ messages in thread From: cvs-commit at gcc dot gnu.org @ 2020-09-11 10:38 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95049 --- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-9 branch has been updated by Richard Biener <rguenth@gcc.gnu.org>: https://gcc.gnu.org/g:0c7ae564f42b605e21001e5e6968a58cc454be9b commit r9-8863-g0c7ae564f42b605e21001e5e6968a58cc454be9b Author: Richard Biener <rguenther@suse.de> Date: Mon May 11 13:40:37 2020 +0200 tree-optimization/95049 - fix not terminating RPO VN iteration This rejects lattice changes from one constant to another. 2020-05-11 Richard Biener <rguenther@suse.de> PR tree-optimization/95049 * tree-ssa-sccvn.c (set_ssa_val_to): Reject lattice transition between different constants. * gcc.dg/torture/pr95049.c: New testcase. (cherry picked from commit 84f4954c38228e4cb3e6f0b5471883e6c2523631) ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/95049] [9 Regression] GCC never terminates with trivial input program 2020-05-11 9:00 [Bug c/95049] New: GCC never terminates with trivial input program luis at luismarques dot eu ` (4 preceding siblings ...) 2020-09-11 10:38 ` [Bug tree-optimization/95049] [9 " cvs-commit at gcc dot gnu.org @ 2020-09-11 10:39 ` rguenth at gcc dot gnu.org 5 siblings, 0 replies; 7+ messages in thread From: rguenth at gcc dot gnu.org @ 2020-09-11 10:39 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95049 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |FIXED Known to work| |9.3.1 Status|ASSIGNED |RESOLVED --- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> --- Fixed. ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2020-09-11 10:39 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2020-05-11 9:00 [Bug c/95049] New: GCC never terminates with trivial input program luis at luismarques dot eu 2020-05-11 9:36 ` [Bug tree-optimization/95049] " rguenth at gcc dot gnu.org 2020-05-11 11:44 ` [Bug tree-optimization/95049] [9/10/11 Regression] " rguenth at gcc dot gnu.org 2020-05-11 15:53 ` cvs-commit at gcc dot gnu.org 2020-06-23 11:06 ` [Bug tree-optimization/95049] [9/10 " cvs-commit at gcc dot gnu.org 2020-09-11 10:38 ` [Bug tree-optimization/95049] [9 " cvs-commit at gcc dot gnu.org 2020-09-11 10:39 ` rguenth at gcc dot gnu.org
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