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* [Bug tree-optimization/95248] New: GCC produces incorrect code with -O3 for loops @ 2020-05-20 21:27 vsevolod.livinskij at frtk dot ru 2020-05-21 7:51 ` [Bug tree-optimization/95248] [11 Regression] GCC produces incorrect code with -O3 for loops since r11-272-gb6ff3ddecfa93d53 marxin at gcc dot gnu.org ` (3 more replies) 0 siblings, 4 replies; 5+ messages in thread From: vsevolod.livinskij at frtk dot ru @ 2020-05-20 21:27 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95248 Bug ID: 95248 Summary: GCC produces incorrect code with -O3 for loops Product: gcc Version: 10.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: vsevolod.livinskij at frtk dot ru Target Milestone: --- GCC produces incorrect code with -O3 for loops Error: >$ gcc -O0 driver.cpp func.cpp && ./a.out 1 >$ gcc -O3 driver.cpp func.cpp && ./a.out 0 Reproducer: >$ cat driver.cpp #include <stdio.h> int var_2 = -2013646301; int var_3 = -1126567434; unsigned int var_12 = 1; unsigned int var_19; unsigned int arr_25 [24] [21] [15] [17] [15] ; void test(); int main() { test(); printf("%u\n", var_19); } >$ cat func.cpp extern int var_2; extern int var_3; extern unsigned int var_12; extern unsigned int var_19; extern unsigned int arr_25 [24] [21] [15] [17] [15] ; void test() { for (int a = 0; a < 3; a = 42) for (int b = 0; b < 20; b++) for (int c = 0; c < 4; c = 4) for (int d = 0; d < 6; d += 4) for (int e = 0; e < 4; e += 2) { arr_25[a][b][c][d][e] = var_2 || var_3; var_19 = var_12; } } GCC version: gcc version 11.0.0 (ed63c387aa0bc1846082524455a6ff1fcec40f9d) ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/95248] [11 Regression] GCC produces incorrect code with -O3 for loops since r11-272-gb6ff3ddecfa93d53 2020-05-20 21:27 [Bug tree-optimization/95248] New: GCC produces incorrect code with -O3 for loops vsevolod.livinskij at frtk dot ru @ 2020-05-21 7:51 ` marxin at gcc dot gnu.org 2020-05-22 6:11 ` rguenth at gcc dot gnu.org ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: marxin at gcc dot gnu.org @ 2020-05-21 7:51 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95248 Martin Liška <marxin at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |marxin at gcc dot gnu.org, | |rguenth at gcc dot gnu.org Known to fail| |11.0 Summary|GCC produces incorrect code |[11 Regression] GCC |with -O3 for loops |produces incorrect code | |with -O3 for loops since | |r11-272-gb6ff3ddecfa93d53 Ever confirmed|0 |1 Known to work| |10.1.0 Last reconfirmed| |2020-05-21 Status|UNCONFIRMED |NEW --- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> --- Confirmed, started with r11-272-gb6ff3ddecfa93d53. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/95248] [11 Regression] GCC produces incorrect code with -O3 for loops since r11-272-gb6ff3ddecfa93d53 2020-05-20 21:27 [Bug tree-optimization/95248] New: GCC produces incorrect code with -O3 for loops vsevolod.livinskij at frtk dot ru 2020-05-21 7:51 ` [Bug tree-optimization/95248] [11 Regression] GCC produces incorrect code with -O3 for loops since r11-272-gb6ff3ddecfa93d53 marxin at gcc dot gnu.org @ 2020-05-22 6:11 ` rguenth at gcc dot gnu.org 2020-05-22 9:46 ` cvs-commit at gcc dot gnu.org 2020-05-22 9:47 ` rguenth at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: rguenth at gcc dot gnu.org @ 2020-05-22 6:11 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95248 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |ASSIGNED Target Milestone|--- |11.0 Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org --- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> --- Mine. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/95248] [11 Regression] GCC produces incorrect code with -O3 for loops since r11-272-gb6ff3ddecfa93d53 2020-05-20 21:27 [Bug tree-optimization/95248] New: GCC produces incorrect code with -O3 for loops vsevolod.livinskij at frtk dot ru 2020-05-21 7:51 ` [Bug tree-optimization/95248] [11 Regression] GCC produces incorrect code with -O3 for loops since r11-272-gb6ff3ddecfa93d53 marxin at gcc dot gnu.org 2020-05-22 6:11 ` rguenth at gcc dot gnu.org @ 2020-05-22 9:46 ` cvs-commit at gcc dot gnu.org 2020-05-22 9:47 ` rguenth at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: cvs-commit at gcc dot gnu.org @ 2020-05-22 9:46 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95248 --- 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:b6ed2e2bca54d1d290f553549d28b0c60a0f240f commit r11-563-gb6ed2e2bca54d1d290f553549d28b0c60a0f240f Author: Richard Biener <rguenther@suse.de> Date: Fri May 22 08:48:04 2020 +0200 tree-optimization/95248 - fix oversight in SM rewrite This fixes a leftover early out in determining the sequence of stores to materialize. 2020-05-22 Richard Biener <rguenther@suse.de> PR tree-optimization/95248 * tree-ssa-loop-im.c (sm_seq_valid_bb): Remove bogus early out. * gcc.dg/torture/pr95248.c: New testcase. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/95248] [11 Regression] GCC produces incorrect code with -O3 for loops since r11-272-gb6ff3ddecfa93d53 2020-05-20 21:27 [Bug tree-optimization/95248] New: GCC produces incorrect code with -O3 for loops vsevolod.livinskij at frtk dot ru ` (2 preceding siblings ...) 2020-05-22 9:46 ` cvs-commit at gcc dot gnu.org @ 2020-05-22 9:47 ` rguenth at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: rguenth at gcc dot gnu.org @ 2020-05-22 9:47 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95248 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] 5+ messages in thread
end of thread, other threads:[~2020-05-22 9:47 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2020-05-20 21:27 [Bug tree-optimization/95248] New: GCC produces incorrect code with -O3 for loops vsevolod.livinskij at frtk dot ru 2020-05-21 7:51 ` [Bug tree-optimization/95248] [11 Regression] GCC produces incorrect code with -O3 for loops since r11-272-gb6ff3ddecfa93d53 marxin at gcc dot gnu.org 2020-05-22 6:11 ` rguenth at gcc dot gnu.org 2020-05-22 9:46 ` cvs-commit at gcc dot gnu.org 2020-05-22 9:47 ` rguenth at gcc dot gnu.org
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