[Bug c++/105838] g++ 12.1.0 runs out of memory or time when building const std::vector of std::strings
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105838 --- Comment #3 from Richard Biener --- Created attachment 53133 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53133=edit unincluded, and reduced This "reduced" testcase peaks at 3.8GB memory. > /usr/bin/time /space/rguenther/install/gcc-12.1/bin/g++ -S -O /tmp/t.C 8.68user 1.13system 0:10.03elapsed 97%CPU (0avgtext+0avgdata 3813480maxresident)k 17328inputs+2104outputs (28major+961476minor)pagefaults 0swaps simply doubling the initializer grows it to 14.8GB > /usr/bin/time /space/rguenther/install/gcc-12.1/bin/g++ -S -O /tmp/t.C 43.02user 4.49system 0:47.51elapsed 99%CPU (0avgtext+0avgdata 14861052maxresident)k 0inputs+4088outputs (0major+3727738minor)pagefaults 0swaps
[Bug c++/105838] g++ 12.1.0 runs out of memory or time when building const std::vector of std::strings
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105838 Richard Biener changed: What|Removed |Added Known to fail||10.3.0 --- Comment #2 from Richard Biener --- GCC 10 is also an order of magnitude slower.
[Bug c++/105838] g++ 12.1.0 runs out of memory or time when building const std::vector of std::strings
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105838 Richard Biener changed: What|Removed |Added Ever confirmed|0 |1 Status|UNCONFIRMED |NEW Last reconfirmed||2022-06-13 --- Comment #1 from Richard Biener --- Confirmed with -O1. At -O0 I see > /usr/bin/time /space/rguenther/install/gcc-12.1/bin/g++ -S t.C 13.44user 0.34system 0:15.71elapsed 87%CPU (0avgtext+0avgdata 1139560maxresident)k 65584inputs+23864outputs (77major+275588minor)pagefaults 0swaps with -O1 it uses >20GB of memory in cleanup_all_empty_eh. It might be the order of optimizing this is exposing some quadratic amount of edge redirection, I have not yet analyzed this in detail but trimming down the testcase should help here. There isn't much allocation done here besides the edge redirection SSA update stuff for PHIs.
