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* [Bug tree-optimization/58957] New: compilation hangs at -O3 on x86_64-linux-gnu (both 32-bit and 64-bit modes) @ 2013-11-01 5:25 su at cs dot ucdavis.edu 2013-11-04 14:36 ` [Bug tree-optimization/58957] [4.8 Regression] compilation slow " rguenth at gcc dot gnu.org ` (4 more replies) 0 siblings, 5 replies; 6+ messages in thread From: su at cs dot ucdavis.edu @ 2013-11-01 5:25 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58957 Bug ID: 58957 Summary: compilation hangs at -O3 on x86_64-linux-gnu (both 32-bit and 64-bit modes) Product: gcc Version: 4.8.2 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: su at cs dot ucdavis.edu The following code causes gcc 4.8.2 (as well as gcc 4.8.0 and gcc 4.8.1) to hang at -O3 on x86_64-linux-gnu in both 32-bit and 64-bit modes. It doesn't affect gcc trunk, 4.7.x, and 4.6.x. $ gcc-trunk -O3 small.c $ gcc-4.6 -O3 small.c $ gcc-4.7 -O3 small.c $ $ gcc-4.8 -O3 small.c ^C $ $ gcc-4.8 -v Using built-in specs. COLLECT_GCC=gcc-4.8 COLLECT_LTO_WRAPPER=/usr/local/gcc-4.8.2/bin/../libexec/gcc/x86_64-unknown-linux-gnu/4.8.2/lto-wrapper Target: x86_64-unknown-linux-gnu Configured with: ../gcc-4.8.2/configure --enable-languages=c,c++,objc,obj-c++,fortran,lto --enable-checking=release --with-gmp=/home/su/software/local/gcc-4.8.2 --with-mpfr=/home/su/software/local/gcc-4.8.2 --with-mpc=/home/su/software/local/gcc-4.8.2 --with-cloog=/home/su/software/local/gcc-4.8.2 --prefix=/home/su/software/local/gcc-4.8.2 Thread model: posix gcc version 4.8.2 (GCC) $ ---------------------------------- void __assert_fail () __attribute__ ((__noreturn__)); int a[10], b, c, d, *e, **f = &e, g, i, *j; unsigned int h; int * foo () { for (c = 0; c < 10; c++) for (i = 1; i >= 0; i--) for (d = 0; d < 10; d++) { j = &a[d]; j >= &a[0] && j <= &a[9] ? (void) 0 : __assert_fail (); } return &b; } int main () { for (g = 3; g < 10; g++) for (; h < 10; h++) *f = foo (); return 0; } ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/58957] [4.8 Regression] compilation slow at -O3 on x86_64-linux-gnu (both 32-bit and 64-bit modes) 2013-11-01 5:25 [Bug tree-optimization/58957] New: compilation hangs at -O3 on x86_64-linux-gnu (both 32-bit and 64-bit modes) su at cs dot ucdavis.edu @ 2013-11-04 14:36 ` rguenth at gcc dot gnu.org 2013-11-04 23:21 ` su at cs dot ucdavis.edu ` (3 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: rguenth at gcc dot gnu.org @ 2013-11-04 14:36 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58957 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |compile-time-hog Known to work| |4.7.3, 4.9.0 Summary|[4.8 Regression] |[4.8 Regression] |compilation hangs at -O3 on |compilation slow at -O3 on |x86_64-linux-gnu (both |x86_64-linux-gnu (both |32-bit and 64-bit modes) |32-bit and 64-bit modes) Known to fail| |4.8.0, 4.8.2 --- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> --- I think it's just awfully slow (deep loop nest, possible to unroll completely). It terminates for me on the branch and for 4.8.2 and 4.8.1. tree CFG cleanup : 8.49 (88%) usr 0.00 ( 0%) sys 8.52 (87%) wall 783 kB ( 2%) ggc TOTAL : 9.70 0.06 9.80 51528 kB on trunk and 4.7.3: TOTAL : 0.09 0.00 0.10 1865 kB ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/58957] [4.8 Regression] compilation slow at -O3 on x86_64-linux-gnu (both 32-bit and 64-bit modes) 2013-11-01 5:25 [Bug tree-optimization/58957] New: compilation hangs at -O3 on x86_64-linux-gnu (both 32-bit and 64-bit modes) su at cs dot ucdavis.edu 2013-11-04 14:36 ` [Bug tree-optimization/58957] [4.8 Regression] compilation slow " rguenth at gcc dot gnu.org @ 2013-11-04 23:21 ` su at cs dot ucdavis.edu 2014-12-10 12:48 ` rguenth at gcc dot gnu.org ` (2 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: su at cs dot ucdavis.edu @ 2013-11-04 23:21 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58957 --- Comment #3 from Zhendong Su <su at cs dot ucdavis.edu> --- (In reply to Richard Biener from comment #2) > I think it's just awfully slow (deep loop nest, possible to unroll > completely). > It terminates for me on the branch and for 4.8.2 and 4.8.1. > > tree CFG cleanup : 8.49 (88%) usr 0.00 ( 0%) sys 8.52 (87%) > wall 783 kB ( 2%) ggc > TOTAL : 9.70 0.06 9.80 > 51528 kB > > on trunk and 4.7.3: > > TOTAL : 0.09 0.00 0.10 > 1865 kB You are right Richard --- I didn't wait long enough. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/58957] [4.8 Regression] compilation slow at -O3 on x86_64-linux-gnu (both 32-bit and 64-bit modes) 2013-11-01 5:25 [Bug tree-optimization/58957] New: compilation hangs at -O3 on x86_64-linux-gnu (both 32-bit and 64-bit modes) su at cs dot ucdavis.edu 2013-11-04 14:36 ` [Bug tree-optimization/58957] [4.8 Regression] compilation slow " rguenth at gcc dot gnu.org 2013-11-04 23:21 ` su at cs dot ucdavis.edu @ 2014-12-10 12:48 ` rguenth at gcc dot gnu.org 2014-12-19 13:42 ` jakub at gcc dot gnu.org 2015-06-23 8:46 ` rguenth at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: rguenth at gcc dot gnu.org @ 2014-12-10 12:48 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58957 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Priority|P3 |P2 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/58957] [4.8 Regression] compilation slow at -O3 on x86_64-linux-gnu (both 32-bit and 64-bit modes) 2013-11-01 5:25 [Bug tree-optimization/58957] New: compilation hangs at -O3 on x86_64-linux-gnu (both 32-bit and 64-bit modes) su at cs dot ucdavis.edu ` (2 preceding siblings ...) 2014-12-10 12:48 ` rguenth at gcc dot gnu.org @ 2014-12-19 13:42 ` jakub at gcc dot gnu.org 2015-06-23 8:46 ` rguenth at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: jakub at gcc dot gnu.org @ 2014-12-19 13:42 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58957 Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Target Milestone|4.8.4 |4.8.5 --- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> --- GCC 4.8.4 has been released. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/58957] [4.8 Regression] compilation slow at -O3 on x86_64-linux-gnu (both 32-bit and 64-bit modes) 2013-11-01 5:25 [Bug tree-optimization/58957] New: compilation hangs at -O3 on x86_64-linux-gnu (both 32-bit and 64-bit modes) su at cs dot ucdavis.edu ` (3 preceding siblings ...) 2014-12-19 13:42 ` jakub at gcc dot gnu.org @ 2015-06-23 8:46 ` rguenth at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: rguenth at gcc dot gnu.org @ 2015-06-23 8:46 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58957 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |FIXED Target Milestone|4.8.5 |4.9.0 Known to fail| |4.8.5 --- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> --- Fixed for 4.9.0. ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2015-06-23 8:44 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2013-11-01 5:25 [Bug tree-optimization/58957] New: compilation hangs at -O3 on x86_64-linux-gnu (both 32-bit and 64-bit modes) su at cs dot ucdavis.edu 2013-11-04 14:36 ` [Bug tree-optimization/58957] [4.8 Regression] compilation slow " rguenth at gcc dot gnu.org 2013-11-04 23:21 ` su at cs dot ucdavis.edu 2014-12-10 12:48 ` rguenth at gcc dot gnu.org 2014-12-19 13:42 ` jakub at gcc dot gnu.org 2015-06-23 8:46 ` rguenth at gcc dot gnu.org
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