https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102943
--- Comment #31 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
With g:r12-5872-gf157c5362b4844f7676cae2aba81a4cf75bd68d5 I limited inliner to
not produce such a large function, so bumping up --param
max-inline-functions-called-once-insns will be necessary to reproduce the
problem.
I will re-do time stats for 1-partition cc1plus LTO build, but I did the same
for linking clang with LTO and passes with over 2% time are:
Time variable usr sys wall
GGC
garbage collection : 26.88 ( 3%) 0.27 ( 1%) 28.53 ( 3%)
0 ( 0%)
ipa lto gimple in : 19.84 ( 2%) 1.86 ( 4%) 28.42 ( 3%)
3660M ( 13%)
cfg cleanup : 15.36 ( 2%) 0.39 ( 1%) 16.38 ( 2%)
154M ( 1%)
df live&initialized regs : 16.20 ( 2%) 0.35 ( 1%) 18.29 ( 2%)
0 ( 0%)
df reg dead/unused notes : 17.94 ( 2%) 0.43 ( 1%) 19.35 ( 2%)
361M ( 1%)
alias analysis : 19.87 ( 2%) 0.24 ( 1%) 21.05 ( 2%)
853M ( 3%)
alias stmt walking : 22.90 ( 2%) 1.25 ( 3%) 25.44 ( 2%)
68M ( 0%)
tree VRP : 22.79 ( 2%) 1.06 ( 2%) 24.22 ( 2%)
488M ( 2%)
tree PTA : 30.37 ( 3%) 1.84 ( 4%) 32.71 ( 3%)
215M ( 1%)
tree operand scan : 19.04 ( 2%) 0.86 ( 2%) 21.70 ( 2%)
1233M ( 5%)
dominator optimization : 28.85 ( 3%) 1.66 ( 4%) 32.00 ( 3%)
531M ( 2%)
backwards jump threading : 23.00 ( 2%) 1.37 ( 3%) 24.52 ( 2%)
154M ( 1%)
tree PRE : 21.81 ( 2%) 1.11 ( 3%) 24.55 ( 2%)
500M ( 2%)
tree FRE : 18.69 ( 2%) 1.40 ( 3%) 20.12 ( 2%)
221M ( 1%)
expand : 21.35 ( 2%) 1.14 ( 3%) 23.27 ( 2%)
2399M ( 9%)
CSE : 20.69 ( 2%) 0.78 ( 2%) 21.82 ( 2%)
124M ( 0%)
CPROP : 16.27 ( 2%) 0.62 ( 1%) 17.10 ( 2%)
419M ( 2%)
combiner : 27.46 ( 3%) 0.81 ( 2%) 30.46 ( 3%)
854M ( 3%)
integrated RA : 70.76 ( 7%) 1.82 ( 4%) 72.74 ( 7%)
3795M ( 14%)
LRA non-specific : 19.51 ( 2%) 0.54 ( 1%) 20.89 ( 2%)
159M ( 1%)
reload CSE regs : 20.32 ( 2%) 0.49 ( 1%) 19.98 ( 2%)
290M ( 1%)
scheduling 2 : 44.95 ( 5%) 0.98 ( 2%) 48.23 ( 4%)
163M ( 1%)
rest of compilation : 30.44 ( 3%) 1.92 ( 4%) 32.03 ( 3%)
366M ( 1%)
TOTAL : 985.14 42.92 1082.89
27226M
So dominators, VRP, and backward searching seems to be still slow on trunk from
20211204
