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* [Bug tree-optimization/95172] New: wrong code at -O1 on x86_64-linux-gnu @ 2020-05-17 5:48 qrzhang at gatech dot edu 2020-05-18 5:56 ` [Bug tree-optimization/95172] [11 Regression] wrong code at -O1 on x86_64-linux-gnu since r11-272-gb6ff3ddecfa93d53 marxin at gcc dot gnu.org ` (3 more replies) 0 siblings, 4 replies; 5+ messages in thread From: qrzhang at gatech dot edu @ 2020-05-17 5:48 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95172 Bug ID: 95172 Summary: wrong code at -O1 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:b6ff3ddecfa93d53867afaaa078f85f $ gcc-trunk -v gcc version 11.0.0 20200516 (experimental) [master revision 53b4d52f114:91c1d944166:f5b461d453043c6b6dda50db0439e4c78b241f03] (GCC) $ gcc-trunk -O1 abc.c ; ./a.out 1 $ gcc-trunk abc.c ; ./a.out 0 $ cat abc.c int a, d; int *b = &a; short c; int main() { for (; c <= 4; c--) { for (; d;) ; a = 1; *b = 0; } printf("%d\n", a); } ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/95172] [11 Regression] wrong code at -O1 on x86_64-linux-gnu since r11-272-gb6ff3ddecfa93d53 2020-05-17 5:48 [Bug tree-optimization/95172] New: wrong code at -O1 on x86_64-linux-gnu qrzhang at gatech dot edu @ 2020-05-18 5:56 ` marxin at gcc dot gnu.org 2020-05-18 6:26 ` rguenth at gcc dot gnu.org ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: marxin at gcc dot gnu.org @ 2020-05-18 5:56 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95172 Martin Liška <marxin at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Last reconfirmed| |2020-05-18 Ever confirmed|0 |1 Known to fail| |11.0 CC| |marxin at gcc dot gnu.org, | |rguenth at gcc dot gnu.org Status|UNCONFIRMED |NEW Summary|[11 Regression] wrong code |[11 Regression] wrong code |at -O1 on x86_64-linux-gnu |at -O1 on x86_64-linux-gnu | |since | |r11-272-gb6ff3ddecfa93d53 Priority|P3 |P1 Target Milestone|--- |11.0 Known to work| |10.1.0 --- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> --- Confirmed. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/95172] [11 Regression] wrong code at -O1 on x86_64-linux-gnu since r11-272-gb6ff3ddecfa93d53 2020-05-17 5:48 [Bug tree-optimization/95172] New: wrong code at -O1 on x86_64-linux-gnu qrzhang at gatech dot edu 2020-05-18 5:56 ` [Bug tree-optimization/95172] [11 Regression] wrong code at -O1 on x86_64-linux-gnu since r11-272-gb6ff3ddecfa93d53 marxin at gcc dot gnu.org @ 2020-05-18 6:26 ` rguenth at gcc dot gnu.org 2020-05-18 9:50 ` cvs-commit at gcc dot gnu.org 2020-05-18 9:50 ` rguenth at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: rguenth at gcc dot gnu.org @ 2020-05-18 6:26 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95172 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org Status|NEW |ASSIGNED Version|unknown |11.0 --- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> --- Mine. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/95172] [11 Regression] wrong code at -O1 on x86_64-linux-gnu since r11-272-gb6ff3ddecfa93d53 2020-05-17 5:48 [Bug tree-optimization/95172] New: wrong code at -O1 on x86_64-linux-gnu qrzhang at gatech dot edu 2020-05-18 5:56 ` [Bug tree-optimization/95172] [11 Regression] wrong code at -O1 on x86_64-linux-gnu since r11-272-gb6ff3ddecfa93d53 marxin at gcc dot gnu.org 2020-05-18 6:26 ` rguenth at gcc dot gnu.org @ 2020-05-18 9:50 ` cvs-commit at gcc dot gnu.org 2020-05-18 9:50 ` rguenth at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: cvs-commit at gcc dot gnu.org @ 2020-05-18 9:50 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95172 --- 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:52a0f83980082c9995f2d8ec9b88548520fb8a5f commit r11-450-g52a0f83980082c9995f2d8ec9b88548520fb8a5f Author: Richard Biener <rguenther@suse.de> Date: Mon May 18 09:17:24 2020 +0200 tree-optimization/95172 - avoid mixing conditionalized and ordered SM The following testcase shows a missed optimization that then leads to wrong-code when issueing SMed stores on exits. When we were able to compute an ordered sequence of stores for an exit we need to emit that in the correct order and we can emit it disregarding to any conditional for whether a store actually happened (we know it did). We can also improve detection as of whether we need conditional processing at all. Both parts fix the testcase. 2020-05-18 Richard Biener <rguenther@suse.de> PR tree-optimization/95172 * tree-ssa-loop-im.c (execute_sm): Get flag whether we eventually need the conditional processing. (execute_sm_exit): When processing an orderd sequence avoid doing any conditional processing. (hoist_memory_references): Pass down whether all edges have ordered processing for a ref to execute_sm. * gcc.dg/torture/pr95172.c: New testcase. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/95172] [11 Regression] wrong code at -O1 on x86_64-linux-gnu since r11-272-gb6ff3ddecfa93d53 2020-05-17 5:48 [Bug tree-optimization/95172] New: wrong code at -O1 on x86_64-linux-gnu qrzhang at gatech dot edu ` (2 preceding siblings ...) 2020-05-18 9:50 ` cvs-commit at gcc dot gnu.org @ 2020-05-18 9:50 ` rguenth at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: rguenth at gcc dot gnu.org @ 2020-05-18 9:50 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95172 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |FIXED Blocks| |57359 Status|ASSIGNED |RESOLVED --- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> --- Fixed. Referenced Bugs: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57359 [Bug 57359] store motion causes wrong code for union access at -O3 ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2020-05-18 9:50 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2020-05-17 5:48 [Bug tree-optimization/95172] New: wrong code at -O1 on x86_64-linux-gnu qrzhang at gatech dot edu 2020-05-18 5:56 ` [Bug tree-optimization/95172] [11 Regression] wrong code at -O1 on x86_64-linux-gnu since r11-272-gb6ff3ddecfa93d53 marxin at gcc dot gnu.org 2020-05-18 6:26 ` rguenth at gcc dot gnu.org 2020-05-18 9:50 ` cvs-commit at gcc dot gnu.org 2020-05-18 9:50 ` rguenth at gcc dot gnu.org
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