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* [Bug ipa/99986] New: missed optimization for dead code elimination at -O3 (vs. -O1) @ 2021-04-09 9:51 zhendong.su at inf dot ethz.ch 2021-04-09 10:55 ` [Bug tree-optimization/99986] " rguenth at gcc dot gnu.org ` (3 more replies) 0 siblings, 4 replies; 5+ messages in thread From: zhendong.su at inf dot ethz.ch @ 2021-04-09 9:51 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99986 Bug ID: 99986 Summary: missed optimization for dead code elimination at -O3 (vs. -O1) Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: ipa Assignee: unassigned at gcc dot gnu.org Reporter: zhendong.su at inf dot ethz.ch CC: marxin at gcc dot gnu.org Target Milestone: --- [599] % gcctk -v Using built-in specs. COLLECT_GCC=gcctk COLLECT_LTO_WRAPPER=/local/suz-local/software/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/11.0.1/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ../gcc-trunk/configure --disable-bootstrap --prefix=/local/suz-local/software/local/gcc-trunk --enable-languages=c,c++ --disable-werror --enable-multilib --with-system-zlib Thread model: posix Supported LTO compression algorithms: zlib gcc version 11.0.1 20210409 (experimental) [master revision 96292c3e343:4e14cad25b9:019a922063f26784d5a070d9198a1f937b8a8343] (GCC) [600] % [600] % gcctk -O1 -S -o O1.s small.c [601] % gcctk -O3 -S -o O3.s small.c [602] % [602] % wc O1.s O3.s 38 86 669 O1.s 48 107 845 O3.s 86 193 1514 total [603] % [603] % grep foo O1.s [604] % grep foo O3.s call foo [605] % [605] % cat small.c extern void foo(void); static int a, *b[8] = {&a}, **c[8]; static void d() { int e = 0; for (; e < 8; e++) c[e] = &b[1]; if (!c[0]) foo(); } int main() { if (a) d(); return 0; } ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/99986] missed optimization for dead code elimination at -O3 (vs. -O1) 2021-04-09 9:51 [Bug ipa/99986] New: missed optimization for dead code elimination at -O3 (vs. -O1) zhendong.su at inf dot ethz.ch @ 2021-04-09 10:55 ` rguenth at gcc dot gnu.org 2021-04-09 11:20 ` zhendong.su at inf dot ethz.ch ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: rguenth at gcc dot gnu.org @ 2021-04-09 10:55 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99986 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Ever confirmed|0 |1 Status|UNCONFIRMED |ASSIGNED Version|unknown |11.0 Component|ipa |tree-optimization Depends on| |99776 Last reconfirmed| |2021-04-09 --- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> --- I think this is a duplicate of PR99776 since I can't reproduce with this fix in. Referenced Bugs: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99776 [Bug 99776] missed optimization for dead code elimination at -O3 (vs. -O1) ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/99986] missed optimization for dead code elimination at -O3 (vs. -O1) 2021-04-09 9:51 [Bug ipa/99986] New: missed optimization for dead code elimination at -O3 (vs. -O1) zhendong.su at inf dot ethz.ch 2021-04-09 10:55 ` [Bug tree-optimization/99986] " rguenth at gcc dot gnu.org @ 2021-04-09 11:20 ` zhendong.su at inf dot ethz.ch 2021-04-27 7:17 ` rguenth at gcc dot gnu.org 2021-05-04 12:29 ` rguenth at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: zhendong.su at inf dot ethz.ch @ 2021-04-09 11:20 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99986 --- Comment #2 from Zhendong Su <zhendong.su at inf dot ethz.ch> --- (In reply to Richard Biener from comment #1) > I think this is a duplicate of PR99776 since I can't reproduce with this fix > in. Thanks for looking into it, Richard! Would you mind also checking the few tests for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99862 whenever you get a chance? I'm happy to file them as separate reports if that would be more convenient. Thank you. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/99986] missed optimization for dead code elimination at -O3 (vs. -O1) 2021-04-09 9:51 [Bug ipa/99986] New: missed optimization for dead code elimination at -O3 (vs. -O1) zhendong.su at inf dot ethz.ch 2021-04-09 10:55 ` [Bug tree-optimization/99986] " rguenth at gcc dot gnu.org 2021-04-09 11:20 ` zhendong.su at inf dot ethz.ch @ 2021-04-27 7:17 ` rguenth at gcc dot gnu.org 2021-05-04 12:29 ` rguenth at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: rguenth at gcc dot gnu.org @ 2021-04-27 7:17 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99986 Bug 99986 depends on bug 99776, which changed state. Bug 99776 Summary: missed optimization for dead code elimination at -O3 (vs. -O1) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99776 What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution|--- |FIXED ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/99986] missed optimization for dead code elimination at -O3 (vs. -O1) 2021-04-09 9:51 [Bug ipa/99986] New: missed optimization for dead code elimination at -O3 (vs. -O1) zhendong.su at inf dot ethz.ch ` (2 preceding siblings ...) 2021-04-27 7:17 ` rguenth at gcc dot gnu.org @ 2021-05-04 12:29 ` rguenth at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: rguenth at gcc dot gnu.org @ 2021-05-04 12:29 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99986 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution|--- |DUPLICATE --- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> --- indeed. *** This bug has been marked as a duplicate of bug 99776 *** ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2021-05-04 12:29 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2021-04-09 9:51 [Bug ipa/99986] New: missed optimization for dead code elimination at -O3 (vs. -O1) zhendong.su at inf dot ethz.ch 2021-04-09 10:55 ` [Bug tree-optimization/99986] " rguenth at gcc dot gnu.org 2021-04-09 11:20 ` zhendong.su at inf dot ethz.ch 2021-04-27 7:17 ` rguenth at gcc dot gnu.org 2021-05-04 12:29 ` rguenth at gcc dot gnu.org
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