https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116398
--- Comment #24 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
So, I've retried the #c10 testing with the #c18 patch modified to do
- int limit = i2_unchanged ? 1200 : INT_MAX;
+ int limit = i2_unchanged ? (getenv ("COMBLIM") ? atoi (getenv ("COMBLIM"))
: 1200) : INT_MAX;
$ for i in 0 10 100 200 400 600 800 1000 1200 10000; do echo COMBLIM=$i time
./cc1plus -quiet -nostdinc -O2 pr101523.ii -mlong-double-128 -march=z196
-fpreprocessed -w; COMBLIM=$i time ./cc1plus -quiet -nostdinc -O2 pr101523.ii
-mlong-double-128 -march=z196 -fpreprocessed -w; done
COMBLIM=0 time ./cc1plus -quiet -nostdinc -O2 pr101523.ii -mlong-double-128
-march=z196 -fpreprocessed -w
13.60user 0.15system 0:13.80elapsed 99%CPU (0avgtext+0avgdata
320656maxresident)k
0inputs+776outputs (0major+106035minor)pagefaults 0swaps
COMBLIM=10 time ./cc1plus -quiet -nostdinc -O2 pr101523.ii -mlong-double-128
-march=z196 -fpreprocessed -w
13.75user 0.13system 0:13.92elapsed 99%CPU (0avgtext+0avgdata
320776maxresident)k
0inputs+784outputs (0major+106049minor)pagefaults 0swaps
COMBLIM=100 time ./cc1plus -quiet -nostdinc -O2 pr101523.ii -mlong-double-128
-march=z196 -fpreprocessed -w
14.38user 0.14system 0:14.58elapsed 99%CPU (0avgtext+0avgdata
323032maxresident)k
0inputs+808outputs (0major+106701minor)pagefaults 0swaps
COMBLIM=200 time ./cc1plus -quiet -nostdinc -O2 pr101523.ii -mlong-double-128
-march=z196 -fpreprocessed -w
13.61user 0.13system 0:13.78elapsed 99%CPU (0avgtext+0avgdata
323060maxresident)k
0inputs+816outputs (0major+106960minor)pagefaults 0swaps
COMBLIM=400 time ./cc1plus -quiet -nostdinc -O2 pr101523.ii -mlong-double-128
-march=z196 -fpreprocessed -w
13.66user 0.15system 0:13.88elapsed 99%CPU (0avgtext+0avgdata
323224maxresident)k
0inputs+816outputs (0major+106994minor)pagefaults 0swaps
COMBLIM=600 time ./cc1plus -quiet -nostdinc -O2 pr101523.ii -mlong-double-128
-march=z196 -fpreprocessed -w
14.30user 0.13system 0:14.47elapsed 99%CPU (0avgtext+0avgdata
323208maxresident)k
0inputs+832outputs (0major+107229minor)pagefaults 0swaps
COMBLIM=800 time ./cc1plus -quiet -nostdinc -O2 pr101523.ii -mlong-double-128
-march=z196 -fpreprocessed -w
13.51user 0.13system 0:13.71elapsed 99%CPU (0avgtext+0avgdata
322008maxresident)k
0inputs+832outputs (0major+107302minor)pagefaults 0swaps
COMBLIM=1000 time ./cc1plus -quiet -nostdinc -O2 pr101523.ii -mlong-double-128
-march=z196 -fpreprocessed -w
14.04user 0.13system 0:14.22elapsed 99%CPU (0avgtext+0avgdata
318300maxresident)k
0inputs+840outputs (0major+106301minor)pagefaults 0swaps
COMBLIM=1200 time ./cc1plus -quiet -nostdinc -O2 pr101523.ii -mlong-double-128
-march=z196 -fpreprocessed -w
13.87user 0.13system 0:14.06elapsed 99%CPU (0avgtext+0avgdata
315260maxresident)k
0inputs+824outputs (0major+106158minor)pagefaults 0swaps
COMBLIM=10000 time ./cc1plus -quiet -nostdinc -O2 pr101523.ii -mlong-double-128
-march=z196 -fpreprocessed -w
20.57user 0.15system 0:20.79elapsed 99%CPU (0avgtext+0avgdata
334344maxresident)k
0inputs+912outputs (0major+114533minor)pagefaults 0swaps
$ rm pr101523.ii.*; COMBLIM=0 ./cc1plus -quiet -nostdinc -O2 pr101523.ii
-mlong-double-128 -march=z196 -fpreprocessed -w -fdump-rtl-combine-stats; awk
'/^attempts:/{attempts+=$2}/^merges:/{merges+=$2}/^extras:/{extras+=$2}/^successes/{successes+=$2}/^two-insn
combine:/{two+=$3}/^three-insn combine:/{three+=$3}/^four-insn
combine:/{four+=$3}/^insn-with-note combine/{note+=$3}END{printf "attempts:
%d\nmerges: %d\nextras: %d\nsuccesses: %d\ntwo-insn combine: %d\nthree-insn
combine: %d\nfour-insn combine: %d\ninsn-with-note combine: %d\n", attempts,
merges, extras, successes, two, three, four, note}' pr101523.ii.*combine*
attempts: 22689
merges: 21761
extras: 5225
successes: 201
two-insn combine: 200
three-insn combine: 1
four-insn combine: 0
insn-with-note combine: 0
$ rm pr101523.ii.*; COMBLIM=10 ./cc1plus -quiet -nostdinc -O2 pr101523.ii
-mlong-double-128 -march=z196 -fpreprocessed -w -fdump-rtl-combine-stats; awk
'/^attempts:/{attempts+=$2}/^merges:/{merges+=$2}/^extras:/{extras+=$2}/^successes/{successes+=$2}/^two-insn
combine:/{two+=$3}/^three-insn combine:/{three+=$3}/^four-insn
combine:/{four+=$3}/^insn-with-note combine/{note+=$3}END{printf "attempts:
%d\nmerges: %d\nextras: %d\nsuccesses: %d\ntwo-insn combine: %d\nthree-insn
combine: %d\nfour-insn combine: %d\ninsn-with-note combine: %d\n", attempts,
merges, extras, successes, two, three, four, note}' pr101523.ii.*combine*
attempts: 22702
merges: 21774
extras: 5238
successes: 214
two-insn combine: 213
three-insn combine: 1
four-insn combine: 0
insn-with-note combine: 0
$ rm pr101523.ii.*; COMBLIM=100 ./cc1plus -quiet -nostdinc -O2 pr101523.ii
-mlong-double-128 -march=z196 -fpreprocessed -w -fdump-rtl-combine-stats; awk
'/^attempts:/{attempts+=$2}/^merges:/{merges+=$2}/^extras:/{extras+=$2}/^successes/{successes+=$2}/^two-insn
combine:/{two+=$3}/^three-insn combine:/{three+=$3}/^four-insn
combine:/{four+=$3}/^insn-with-note combine/{note+=$3}END{printf "attempts:
%d\nmerges: %d\nextras: %d\nsuccesses: %d\ntwo-insn combine: %d\nthree-insn
combine: %d\nfour-insn combine: %d\ninsn-with-note combine: %d\n", attempts,
merges, extras, successes, two, three, four, note}' pr101523.ii.*combine*
attempts: 23581
merges: 22653
extras: 5930
successes: 820
two-insn combine: 819
three-insn combine: 1
four-insn combine: 0
insn-with-note combine: 0
$ rm pr101523.ii.*; COMBLIM=200 ./cc1plus -quiet -nostdinc -O2 pr101523.ii
-mlong-double-128 -march=z196 -fpreprocessed -w -fdump-rtl-combine-stats; awk
'/^attempts:/{attempts+=$2}/^merges:/{merges+=$2}/^extras:/{extras+=$2}/^successes/{successes+=$2}/^two-insn
combine:/{two+=$3}/^three-insn combine:/{three+=$3}/^four-insn
combine:/{four+=$3}/^insn-with-note combine/{note+=$3}END{printf "attempts:
%d\nmerges: %d\nextras: %d\nsuccesses: %d\ntwo-insn combine: %d\nthree-insn
combine: %d\nfour-insn combine: %d\ninsn-with-note combine: %d\n", attempts,
merges, extras, successes, two, three, four, note}' pr101523.ii.*combine*
attempts: 25041
merges: 24113
extras: 6775
successes: 1467
two-insn combine: 1466
three-insn combine: 1
four-insn combine: 0
insn-with-note combine: 0
$ rm pr101523.ii.*; COMBLIM=400 ./cc1plus -quiet -nostdinc -O2 pr101523.ii
-mlong-double-128 -march=z196 -fpreprocessed -w -fdump-rtl-combine-stats; awk
'/^attempts:/{attempts+=$2}/^merges:/{merges+=$2}/^extras:/{extras+=$2}/^successes/{successes+=$2}/^two-insn
combine:/{two+=$3}/^three-insn combine:/{three+=$3}/^four-insn
combine:/{four+=$3}/^insn-with-note combine/{note+=$3}END{printf "attempts:
%d\nmerges: %d\nextras: %d\nsuccesses: %d\ntwo-insn combine: %d\nthree-insn
combine: %d\nfour-insn combine: %d\ninsn-with-note combine: %d\n", attempts,
merges, extras, successes, two, three, four, note}' pr101523.ii.*combine*
attempts: 26794
merges: 25853
extras: 7798
successes: 2229
two-insn combine: 2228
three-insn combine: 1
four-insn combine: 0
insn-with-note combine: 0
$ rm pr101523.ii.*; COMBLIM=600 ./cc1plus -quiet -nostdinc -O2 pr101523.ii
-mlong-double-128 -march=z196 -fpreprocessed -w -fdump-rtl-combine-stats; awk
'/^attempts:/{attempts+=$2}/^merges:/{merges+=$2}/^extras:/{extras+=$2}/^successes/{successes+=$2}/^two-insn
combine:/{two+=$3}/^three-insn combine:/{three+=$3}/^four-insn
combine:/{four+=$3}/^insn-with-note combine/{note+=$3}END{printf "attempts:
%d\nmerges: %d\nextras: %d\nsuccesses: %d\ntwo-insn combine: %d\nthree-insn
combine: %d\nfour-insn combine: %d\ninsn-with-note combine: %d\n", attempts,
merges, extras, successes, two, three, four, note}' pr101523.ii.*combine*
attempts: 28891
merges: 27950
extras: 8673
successes: 2724
two-insn combine: 2723
three-insn combine: 1
four-insn combine: 0
insn-with-note combine: 0
$ rm pr101523.ii.*; COMBLIM=800 ./cc1plus -quiet -nostdinc -O2 pr101523.ii
-mlong-double-128 -march=z196 -fpreprocessed -w -fdump-rtl-combine-stats; awk
'/^attempts:/{attempts+=$2}/^merges:/{merges+=$2}/^extras:/{extras+=$2}/^successes/{successes+=$2}/^two-insn
combine:/{two+=$3}/^three-insn combine:/{three+=$3}/^four-insn
combine:/{four+=$3}/^insn-with-note combine/{note+=$3}END{printf "attempts:
%d\nmerges: %d\nextras: %d\nsuccesses: %d\ntwo-insn combine: %d\nthree-insn
combine: %d\nfour-insn combine: %d\ninsn-with-note combine: %d\n", attempts,
merges, extras, successes, two, three, four, note}' pr101523.ii.*combine*
attempts: 30524
merges: 29577
extras: 9486
successes: 3312
two-insn combine: 3311
three-insn combine: 1
four-insn combine: 0
insn-with-note combine: 0
$ rm pr101523.ii.*; COMBLIM=1000 ./cc1plus -quiet -nostdinc -O2 pr101523.ii
-mlong-double-128 -march=z196 -fpreprocessed -w -fdump-rtl-combine-stats; awk
'/^attempts:/{attempts+=$2}/^merges:/{merges+=$2}/^extras:/{extras+=$2}/^successes/{successes+=$2}/^two-insn
combine:/{two+=$3}/^three-insn combine:/{three+=$3}/^four-insn
combine:/{four+=$3}/^insn-with-note combine/{note+=$3}END{printf "attempts:
%d\nmerges: %d\nextras: %d\nsuccesses: %d\ntwo-insn combine: %d\nthree-insn
combine: %d\nfour-insn combine: %d\ninsn-with-note combine: %d\n", attempts,
merges, extras, successes, two, three, four, note}' pr101523.ii.*combine*
attempts: 40752
merges: 39805
extras: 12155
successes: 3837
two-insn combine: 3836
three-insn combine: 1
four-insn combine: 0
insn-with-note combine: 0
$ rm pr101523.ii.*; COMBLIM=1200 ./cc1plus -quiet -nostdinc -O2 pr101523.ii
-mlong-double-128 -march=z196 -fpreprocessed -w -fdump-rtl-combine-stats; awk
'/^attempts:/{attempts+=$2}/^merges:/{merges+=$2}/^extras:/{extras+=$2}/^successes/{successes+=$2}/^two-insn
combine:/{two+=$3}/^three-insn combine:/{three+=$3}/^four-insn
combine:/{four+=$3}/^insn-with-note combine/{note+=$3}END{printf "attempts:
%d\nmerges: %d\nextras: %d\nsuccesses: %d\ntwo-insn combine: %d\nthree-insn
combine: %d\nfour-insn combine: %d\ninsn-with-note combine: %d\n", attempts,
merges, extras, successes, two, three, four, note}' pr101523.ii.*combine*
attempts: 44399
merges: 43446
extras: 13218
successes: 4142
two-insn combine: 4141
three-insn combine: 1
four-insn combine: 0
insn-with-note combine: 0
$ rm pr101523.ii.*; COMBLIM=10000 ./cc1plus -quiet -nostdinc -O2 pr101523.ii
-mlong-double-128 -march=z196 -fpreprocessed -w -fdump-rtl-combine-stats; awk
'/^attempts:/{attempts+=$2}/^merges:/{merges+=$2}/^extras:/{extras+=$2}/^successes/{successes+=$2}/^two-insn
combine:/{two+=$3}/^three-insn combine:/{three+=$3}/^four-insn
combine:/{four+=$3}/^insn-with-note combine/{note+=$3}END{printf "attempts:
%d\nmerges: %d\nextras: %d\nsuccesses: %d\ntwo-insn combine: %d\nthree-insn
combine: %d\nfour-insn combine: %d\ninsn-with-note combine: %d\n", attempts,
merges, extras, successes, two, three, four, note}' pr101523.ii.*combine*
attempts: 204792
merges: 203800
extras: 52585
successes: 8924
two-insn combine: 8923
three-insn combine: 1
four-insn combine: 0
insn-with-note combine: 0
