[Bug rtl-optimization/67396] [5 regression] Performance regression compiling variadic function with many arguments in RTL DSE
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67396 Serge Belyshev changed: What|Removed |Added CC||belyshev at depni dot sinp.msu.ru --- Comment #14 from Serge Belyshev --- For the record: O(N^3) on the testcase with -mno-accumulate-outgoing-args started with r169782. And then it was "fixed" to O(N^2) by r234709 with the help from max-dse-active-local-stores param introduced in r171090. The testcase is interesting in that with different options (-maccumulate-outgoing-args or -g -fVTA) it triggers another O(N^2) slowdowns started from different revisions. Current trunk with -mno-accumulate-outgoing-args exhibits saw-like O(N^2) behaviour controlled by max-dse-active-local-stores param, and for N=5000 (right before max-dse-active-local-stores triggers) times are: gcc-4.5 0.1 s gcc-9.0 2.8 s It is noticeable during glibc make check under qemu-riscv64, when stdio-common/tst-printf-bz18872.c takes about 1h to compile.
[Bug rtl-optimization/67396] [5 regression] Performance regression compiling variadic function with many arguments in RTL DSE
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67396 Jakub Jelinek changed: What|Removed |Added Target Milestone|5.5 |6.0
[Bug rtl-optimization/67396] [5 regression] Performance regression compiling variadic function with many arguments in RTL DSE
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67396 Jakub Jelinek changed: What|Removed |Added Status|NEW |RESOLVED Resolution|--- |FIXED --- Comment #13 from Jakub Jelinek --- GCC 5 branch has been closed, should be fixed in GCC 6 and later.
[Bug rtl-optimization/67396] [5 regression] Performance regression compiling variadic function with many arguments in RTL DSE
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67396 Jakub Jelinek changed: What|Removed |Added CC||jakub at gcc dot gnu.org Summary|[5/6/7 regression] |[5 regression] Performance |Performance regression |regression compiling |compiling variadic function |variadic function with many |with many arguments in RTL |arguments in RTL DSE |DSE | --- Comment #12 from Jakub Jelinek --- This doesn't reproduce since r234709, even with 1 arguments even checking compiler takes just 7 seconds.
