https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38474
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |jakub at gcc dot gnu.org
--- Comment #83 from Richard Biener <rguenth at gcc dot gnu.org> ---
Meh. On trunk (GCC 11) we now have for the reduced testcase
> ./f951 -quiet testcase_reduced.f90 -ffree-line-length-512 -ftime-report -O3
Time variable usr sys wall
GGC
...
callgraph ipa passes : 28.09 ( 8%) 0.23 ( 38%) 28.33 ( 8%)
68M ( 12%)
ipa inlining heuristics : 5.13 ( 1%) 0.01 ( 2%) 5.13 ( 1%)
14M ( 3%)
alias stmt walking : 7.03 ( 2%) 0.09 ( 15%) 7.15 ( 2%)
277k ( 0%)
tree PTA : 26.20 ( 7%) 0.17 ( 28%) 26.39 ( 7%)
25M ( 5%)
store merging : 308.60 ( 84%) 0.01 ( 2%) 308.70 ( 84%)
3858k ( 1%)
TOTAL : 365.68 0.61 366.42
557M
so store-merging goes bollocks. I will try to dig into it a bit but I'm not
very familiar with the code. GCC 10 behaves similar here but not as bad:
store merging : 232.10 ( 82%) 0.02 ( 4%) 232.19 ( 82%)
3837 kB ( 1%)
TOTAL : 283.51 0.45 284.05
582957 kB
while GCC 9 is sane:
store merging : 0.04 ( 0%) 0.00 ( 0%) 0.04 ( 0%)
2700 kB ( 1%)
TOTAL : 88.59 0.70 89.34
521364 kB
