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* [Bug tree-optimization/95045] New: wrong code at -O3 on x86_64-linux-gnu
@ 2020-05-11 5:11 qrzhang at gatech dot edu
2020-05-11 6:55 ` [Bug tree-optimization/95045] " rguenth at gcc dot gnu.org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: qrzhang at gatech dot edu @ 2020-05-11 5:11 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95045
Bug ID: 95045
Summary: wrong code at -O3 on x86_64-linux-gnu
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: qrzhang at gatech dot edu
Target Milestone: ---
Recent regression. Bisection points to g:283cb9ea6293e813e4
$ gcc-trunk -v
gcc version 11.0.0 20200510 (experimental) [master revision
4ae915cdbf0:8eedda9eef3:ef6394205d7bcab00dca01182d708ad5a6360a7b] (GCC)
$ gcc-trunk abc.c ; ./a.out
4
$ gcc-trunk -O3 abc.c ; ./a.out
0
$ cat abc.c
int a, c, f;
long b;
char d;
int e[3];
int g[9][3][2];
int main() {
{
h:
for (f = 0; f <= 5; f++) {
b = 3;
for (; b >= 0; b--) {
e[2] = d = 0;
for (; d <= 3; d++) {
g[8][2][0] = e[1] = c = 0;
for (; c <= 1; c++)
e[c + 1] = g[d + 5][2][c] = 4;
}
if (a)
goto h;
}
}
}
printf("%d\n", e[2]);
}
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug tree-optimization/95045] wrong code at -O3 on x86_64-linux-gnu 2020-05-11 5:11 [Bug tree-optimization/95045] New: wrong code at -O3 on x86_64-linux-gnu qrzhang at gatech dot edu @ 2020-05-11 6:55 ` rguenth at gcc dot gnu.org 2020-05-11 7:27 ` [Bug tree-optimization/95045] [11 Regression] " marxin at gcc dot gnu.org ` (3 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: rguenth at gcc dot gnu.org @ 2020-05-11 6:55 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95045 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |ASSIGNED Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org Last reconfirmed| |2020-05-11 Ever confirmed|0 |1 --- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> --- Mine. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/95045] [11 Regression] wrong code at -O3 on x86_64-linux-gnu 2020-05-11 5:11 [Bug tree-optimization/95045] New: wrong code at -O3 on x86_64-linux-gnu qrzhang at gatech dot edu 2020-05-11 6:55 ` [Bug tree-optimization/95045] " rguenth at gcc dot gnu.org @ 2020-05-11 7:27 ` marxin at gcc dot gnu.org 2020-05-11 8:01 ` rguenth at gcc dot gnu.org ` (2 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: marxin at gcc dot gnu.org @ 2020-05-11 7:27 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95045 Martin Liška <marxin at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Target Milestone|--- |11.0 Known to work| |10.1.0 CC| |marxin at gcc dot gnu.org Summary|wrong code at -O3 on |[11 Regression] wrong code |x86_64-linux-gnu |at -O3 on x86_64-linux-gnu Known to fail| |11.0 Version|unknown |11.0 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/95045] [11 Regression] wrong code at -O3 on x86_64-linux-gnu 2020-05-11 5:11 [Bug tree-optimization/95045] New: wrong code at -O3 on x86_64-linux-gnu qrzhang at gatech dot edu 2020-05-11 6:55 ` [Bug tree-optimization/95045] " rguenth at gcc dot gnu.org 2020-05-11 7:27 ` [Bug tree-optimization/95045] [11 Regression] " marxin at gcc dot gnu.org @ 2020-05-11 8:01 ` rguenth at gcc dot gnu.org 2020-05-12 6:22 ` cvs-commit at gcc dot gnu.org 2020-05-12 6:26 ` rguenth at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: rguenth at gcc dot gnu.org @ 2020-05-11 8:01 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95045 --- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> --- OK, this one is an interesting one (might be also latent before the rewrite). I'll deal with it separately. The issue is around the inner loop having multiple exits, one being also the exit from the outer loop and edge inserts on that edge getting mis-ordered (we commit them only after processing all inserts). ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/95045] [11 Regression] wrong code at -O3 on x86_64-linux-gnu 2020-05-11 5:11 [Bug tree-optimization/95045] New: wrong code at -O3 on x86_64-linux-gnu qrzhang at gatech dot edu ` (2 preceding siblings ...) 2020-05-11 8:01 ` rguenth at gcc dot gnu.org @ 2020-05-12 6:22 ` cvs-commit at gcc dot gnu.org 2020-05-12 6:26 ` rguenth at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: cvs-commit at gcc dot gnu.org @ 2020-05-12 6:22 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95045 --- Comment #3 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:bb63ca63e744c08bc5a9ffa53df62ea35f098b0b commit r11-308-gbb63ca63e744c08bc5a9ffa53df62ea35f098b0b Author: Richard Biener <rguenther@suse.de> Date: Mon May 11 15:26:09 2020 +0200 tree-optimization/95045 - fix SM with exit exiting multiple loops Since we apply SM to an edge which exits multiple loops we have to make sure to commit insertions on it immediately since otherwise store order is not preserved. 2020-05-12 Richard Biener <rguenther@suse.de> PR tree-optimization/95045 * dbgcnt.def (lim): Add debug-counter. * tree-ssa-loop-im.c: Include dbgcnt.h. (find_refs_for_sm): Use lim debug counter for store motion candidates. (do_store_motion): Rename form store_motion. Commit edge insertions... (store_motion_loop): ... here. (tree_ssa_lim): Adjust. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/95045] [11 Regression] wrong code at -O3 on x86_64-linux-gnu 2020-05-11 5:11 [Bug tree-optimization/95045] New: wrong code at -O3 on x86_64-linux-gnu qrzhang at gatech dot edu ` (3 preceding siblings ...) 2020-05-12 6:22 ` cvs-commit at gcc dot gnu.org @ 2020-05-12 6:26 ` rguenth at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: rguenth at gcc dot gnu.org @ 2020-05-12 6:26 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95045 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution|--- |FIXED --- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> --- Fixed. ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2020-05-12 6:26 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2020-05-11 5:11 [Bug tree-optimization/95045] New: wrong code at -O3 on x86_64-linux-gnu qrzhang at gatech dot edu 2020-05-11 6:55 ` [Bug tree-optimization/95045] " rguenth at gcc dot gnu.org 2020-05-11 7:27 ` [Bug tree-optimization/95045] [11 Regression] " marxin at gcc dot gnu.org 2020-05-11 8:01 ` rguenth at gcc dot gnu.org 2020-05-12 6:22 ` cvs-commit at gcc dot gnu.org 2020-05-12 6:26 ` rguenth at gcc dot gnu.org
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