[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45422 --- Comment #37 from Jakub Jelinek jakub at gcc dot gnu.org 2011-01-27 15:55:57 UTC --- /usr/src/gcc/objr/gcc/f951 -quiet -ftime-report -fbounds-check -g -O3 -ffast-math -funroll-loops -ftree-vectorize -march=amdfam10 pr45422.f90 21 | grep ':[ ]*[1-9]\|TOTAL' garbage collection: 1.34 ( 1%) usr 0.00 ( 0%) sys 1.32 ( 1%) wall 0 kB ( 0%) ggc cfg cleanup : 2.24 ( 2%) usr 0.01 ( 0%) sys 2.26 ( 2%) wall 7301 kB ( 0%) ggc df reaching defs : 1.46 ( 1%) usr 0.02 ( 1%) sys 1.34 ( 1%) wall 0 kB ( 0%) ggc df live regs : 8.28 ( 6%) usr 0.02 ( 1%) sys 8.49 ( 6%) wall 0 kB ( 0%) ggc df liveinitialized regs: 2.46 ( 2%) usr 0.00 ( 0%) sys 2.98 ( 2%) wall 0 kB ( 0%) ggc df use-def / def-use chains: 1.31 ( 1%) usr 0.00 ( 0%) sys 1.13 ( 1%) wall 0 kB ( 0%) ggc df reg dead/unused notes: 4.01 ( 3%) usr 0.00 ( 0%) sys 4.03 ( 3%) wall 7770 kB ( 0%) ggc register information : 1.48 ( 1%) usr 0.00 ( 0%) sys 1.53 ( 1%) wall 0 kB ( 0%) ggc alias analysis: 1.86 ( 1%) usr 0.00 ( 0%) sys 1.89 ( 1%) wall 46655 kB ( 3%) ggc tree VRP : 2.25 ( 2%) usr 0.08 ( 4%) sys 2.27 ( 2%) wall 74472 kB ( 4%) ggc tree SSA incremental : 1.43 ( 1%) usr 0.25 (11%) sys 1.34 ( 1%) wall 7187 kB ( 0%) ggc complete unrolling: 1.19 ( 1%) usr 0.14 ( 6%) sys 1.24 ( 1%) wall 91809 kB ( 5%) ggc tree prefetching : 1.31 ( 1%) usr 0.12 ( 5%) sys 1.50 ( 1%) wall 92179 kB ( 5%) ggc tree iv optimization : 15.43 (11%) usr 0.09 ( 4%) sys 15.62 (11%) wall 303704 kB (17%) ggc expand: 1.11 ( 1%) usr 0.03 ( 1%) sys 1.11 ( 1%) wall 81489 kB ( 5%) ggc forward prop : 1.17 ( 1%) usr 0.01 ( 0%) sys 1.19 ( 1%) wall 16030 kB ( 1%) ggc CSE : 1.58 ( 1%) usr 0.01 ( 0%) sys 1.42 ( 1%) wall 667 kB ( 0%) ggc dead code elimination : 1.24 ( 1%) usr 0.00 ( 0%) sys 1.30 ( 1%) wall 0 kB ( 0%) ggc dead store elim1 : 1.37 ( 1%) usr 0.00 ( 0%) sys 1.31 ( 1%) wall 23509 kB ( 1%) ggc dead store elim2 : 1.10 ( 1%) usr 0.00 ( 0%) sys 1.08 ( 1%) wall 22323 kB ( 1%) ggc loop unrolling: 3.99 ( 3%) usr 0.03 ( 1%) sys 4.11 ( 3%) wall 185245 kB (11%) ggc CPROP : 2.25 ( 2%) usr 0.01 ( 0%) sys 2.00 ( 1%) wall 25084 kB ( 1%) ggc PRE : 1.20 ( 1%) usr 0.00 ( 0%) sys 1.13 ( 1%) wall 1576 kB ( 0%) ggc web : 1.09 ( 1%) usr 0.00 ( 0%) sys 1.09 ( 1%) wall 8368 kB ( 0%) ggc CSE 2 : 2.10 ( 2%) usr 0.01 ( 0%) sys 2.17 ( 2%) wall 2122 kB ( 0%) ggc combiner : 3.97 ( 3%) usr 0.00 ( 0%) sys 3.96 ( 3%) wall 60594 kB ( 3%) ggc integrated RA : 10.18 ( 7%) usr 0.01 ( 0%) sys 10.27 ( 7%) wall 44477 kB ( 3%) ggc reload: 6.31 ( 5%) usr 0.01 ( 0%) sys 6.24 ( 4%) wall 10153 kB ( 1%) ggc reload CSE regs : 4.39 ( 3%) usr 0.01 ( 0%) sys 4.17 ( 3%) wall 37354 kB ( 2%) ggc rename registers : 1.13 ( 1%) usr 0.00 ( 0%) sys 1.18 ( 1%) wall 2500 kB ( 0%) ggc scheduling 2 : 5.84 ( 4%) usr 0.02 ( 1%) sys 5.81 ( 4%) wall 1160 kB ( 0%) ggc final : 4.29 ( 3%) usr 0.04 ( 2%) sys 4.66 ( 3%) wall 10463 kB ( 1%) ggc variable tracking : 2.76 ( 2%) usr 0.01 ( 0%) sys 2.73 ( 2%) wall 64964 kB ( 4%) ggc var-tracking dataflow : 3.86 ( 3%) usr 0.02 ( 1%) sys 3.90 ( 3%) wall 0 kB ( 0%) ggc var-tracking emit : 3.89 ( 3%) usr 0.01 ( 0%) sys 3.85 ( 3%) wall 19488 kB ( 1%) ggc rest of compilation : 2.27 ( 2%) usr 0.08 ( 4%) sys 2.28 ( 2%) wall 21438 kB ( 1%) ggc remove unused locals : 1.02 ( 1%) usr 0.01 ( 0%) sys 0.92 ( 1%) wall 0 kB ( 0%) ggc unaccounted todo : 1.21 ( 1%) usr 0.05 ( 2%) sys 1.19 ( 1%) wall 8 kB ( 0%) ggc TOTAL : 137.09 2.28 139.39 1741129 kB /usr/src/gcc-4.5/objr/gcc/f951 -quiet -ftime-report -fbounds-check -g -O3 -ffast-math -funroll-loops -ftree-vectorize -march=amdfam10 pr45422.f90 21 | grep ':[ ]*[1-9]\|TOTAL' df live regs : 2.05 ( 4%) usr 0.00 ( 0%) sys 1.95 ( 4%) wall 0 kB ( 0%) ggc tree VRP : 1.43 ( 3%) usr 0.15 ( 8%) sys 1.47 ( 3%) wall 56376 kB ( 6%) ggc complete unrolling: 1.14 ( 2%) usr 0.18 (10%) sys 1.39 ( 3%) wall 98554 kB (11%) ggc tree iv optimization : 5.31 (10%) usr 0.05 ( 3%) sys 5.40 (10%) wall 95356 kB (11%) ggc expand: 2.98 ( 6%) usr 0.11 ( 6%) sys 3.29 ( 6%) wall 69642 kB ( 8%) ggc combiner : 1.49 ( 3%) usr 0.00 ( 0%) sys 1.22 ( 2%) wall 19980 kB ( 2%) ggc integrated RA : 3.60 ( 7%) usr 0.01 ( 1%) sys 3.56 ( 6%) wall 12746 kB
[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45422 --- Comment #38 from Jakub Jelinek jakub at gcc dot gnu.org 2011-01-27 16:02:49 UTC --- *.gimple dump is roughly the same size between 4.5 and 4.6, but resulting assembly size is 15MB in 4.5 and 23MB (with only 100KB variation with -fno-ivopts) in 4.6. -fno-inline doesn't help neither compile time nor assembly size though on 4.6.
[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45422 --- Comment #39 from Richard Guenther rguenth at gcc dot gnu.org 2011-01-27 16:16:48 UTC --- The size difference is likely from prefetching, it's 1.5MB vs. 1.1MB without that (-O3 -fbounds-check -ffast-math -funroll-loops). Prefetching usually causes another set of (then RTL unrolled) loop copies. See PR44688.
[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45422 --- Comment #40 from Richard Guenther rguenth at gcc dot gnu.org 2011-01-27 16:19:26 UTC --- Btw, when I remove -fbounds-check the sizes are comparable (without prefetching), so I guess we are just better in removing bounds checking for 4.6 and that triggers size-costly loop opts such as vectorization and unrolling.
[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45422 --- Comment #41 from Jakub Jelinek jakub at gcc dot gnu.org 2011-01-27 16:28:49 UTC --- With additional -fno-prefetch-loop-arrays the TOTAL goes down from that 137s to 92.23, and judging from tree dumps between 4.5 and 4.6 we do significantly more vectorization too (4.6 *.ifcvt is 4.7MB compared to 5.3MB 4.5 *.ifcvt, while 4.6 *.vect grows to 8.3MB while 4.5 *.vect stays at 5.3MB).
[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45422 --- Comment #42 from Richard Guenther rguenth at gcc dot gnu.org 2011-01-27 16:30:52 UTC --- Comparing -O3 -ffast-math -funroll-loops -fno-inline -fno-partial-inlining (thus generic arch, without prefetching): trunk: df live regs : 4.22 ( 6%) usr 0.04 ( 2%) sys 4.11 ( 5%) wall 0 kB ( 0%) ggc tree iv optimization : 3.92 ( 5%) usr 0.13 ( 5%) sys 4.29 ( 6%) wall 91066 kB (11%) ggc integrated RA : 5.57 ( 8%) usr 0.10 ( 4%) sys 5.93 ( 8%) wall 26408 kB ( 3%) ggc scheduling 2 : 3.73 ( 5%) usr 0.04 ( 2%) sys 3.85 ( 5%) wall 939 kB ( 0%) ggc TOTAL : 73.68 2.3776.91 852775 kB 4.5: df live regs : 4.60 ( 7%) usr 0.02 ( 1%) sys 4.62 ( 6%) wall 0 kB ( 0%) ggc expand: 3.94 ( 6%) usr 0.17 ( 8%) sys 3.94 ( 6%) wall 62218 kB ( 8%) ggc integrated RA : 5.73 ( 8%) usr 0.02 ( 1%) sys 5.76 ( 8%) wall 22920 kB ( 3%) ggc reload: 3.78 ( 5%) usr 0.08 ( 4%) sys 3.86 ( 5%) wall 9291 kB ( 1%) ggc TOTAL : 68.98 2.0171.22 828137 kB it would be nice to confirm that we are indeed much better with optimizing bounds-checking code. The prefetching issue is tracked as PR44688. So I'd close this either as a dup or as wontfix (it's a feature that we optimize loops with bounds-checking).
[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45422 Jakub Jelinek jakub at gcc dot gnu.org changed: What|Removed |Added Status|NEW |RESOLVED Resolution||WONTFIX --- Comment #43 from Jakub Jelinek jakub at gcc dot gnu.org 2011-01-27 16:43:17 UTC --- Yeah, I agree.
[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45422 --- Comment #44 from davidxl xinliangli at gmail dot com 2011-01-27 17:33:42 UTC --- Nice triaging.. David
[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45422 --- Comment #32 from Jakub Jelinek jakub at gcc dot gnu.org 2011-01-25 09:02:57 UTC --- IMHO for P1 purposes we should just look at compile time regressions from 4.5 here at this point. On the #c1 testcase I get with --enable-checking=release current trunk and current 4.5 branch on x86_64-linux: 4.6 x86_64 -m64 -O3 -fbounds-check -ftime-report df live regs : 1.87 ( 3%) usr 0.02 ( 1%) sys 1.66 ( 3%) wall 0 kB ( 0%) ggc parser: 1.04 ( 2%) usr 0.20 ( 9%) sys 1.24 ( 2%) wall 53425 kB ( 6%) ggc tree VRP : 1.82 ( 3%) usr 0.09 ( 4%) sys 2.02 ( 3%) wall 63870 kB ( 8%) ggc tree PTA : 1.02 ( 2%) usr 0.01 ( 0%) sys 0.98 ( 2%) wall 5498 kB ( 1%) ggc tree SSA incremental : 1.23 ( 2%) usr 0.12 ( 6%) sys 1.11 ( 2%) wall 6733 kB ( 1%) ggc tree CCP : 1.33 ( 2%) usr 0.03 ( 1%) sys 1.33 ( 2%) wall 4989 kB ( 1%) ggc complete unrolling: 1.07 ( 2%) usr 0.16 ( 8%) sys 1.28 ( 2%) wall 88755 kB (11%) ggc tree iv optimization : 10.99 (19%) usr 0.09 ( 4%) sys 11.09 (19%) wall 138994 kB (16%) ggc CSE : 1.28 ( 2%) usr 0.01 ( 0%) sys 1.28 ( 2%) wall 229 kB ( 0%) ggc combiner : 2.00 ( 3%) usr 0.00 ( 0%) sys 1.95 ( 3%) wall 31554 kB ( 4%) ggc integrated RA : 3.68 ( 6%) usr 0.01 ( 0%) sys 3.78 ( 6%) wall 19906 kB ( 2%) ggc reload: 2.04 ( 4%) usr 0.00 ( 0%) sys 2.18 ( 4%) wall 7106 kB ( 1%) ggc reload CSE regs : 2.04 ( 4%) usr 0.02 ( 1%) sys 2.01 ( 3%) wall 12188 kB ( 1%) ggc scheduling 2 : 2.55 ( 4%) usr 0.01 ( 0%) sys 2.61 ( 4%) wall 895 kB ( 0%) ggc TOTAL : 57.47 2.1159.60 845009 kB 4.5 x86_64 -m64 -O3 -fbounds-check -ftime-report df live regs : 1.58 ( 4%) usr 0.00 ( 0%) sys 1.39 ( 3%) wall 0 kB ( 0%) ggc parser: 1.02 ( 2%) usr 0.18 ( 9%) sys 1.21 ( 3%) wall 55472 kB ( 7%) ggc tree VRP : 1.39 ( 3%) usr 0.13 ( 6%) sys 1.73 ( 4%) wall 56478 kB ( 8%) ggc tree PRE : 1.03 ( 2%) usr 0.04 ( 2%) sys 1.24 ( 3%) wall 7286 kB ( 1%) ggc complete unrolling: 1.32 ( 3%) usr 0.21 (10%) sys 1.55 ( 3%) wall 91137 kB (12%) ggc tree iv optimization : 5.45 (12%) usr 0.09 ( 4%) sys 5.43 (12%) wall 95576 kB (13%) ggc expand: 2.62 ( 6%) usr 0.16 ( 8%) sys 2.76 ( 6%) wall 58104 kB ( 8%) ggc CSE : 1.18 ( 3%) usr 0.01 ( 0%) sys 0.94 ( 2%) wall 261 kB ( 0%) ggc combiner : 1.53 ( 3%) usr 0.00 ( 0%) sys 1.48 ( 3%) wall 19953 kB ( 3%) ggc integrated RA : 3.21 ( 7%) usr 0.00 ( 0%) sys 3.55 ( 8%) wall 11410 kB ( 2%) ggc reload: 2.13 ( 5%) usr 0.04 ( 2%) sys 2.00 ( 4%) wall 7273 kB ( 1%) ggc reload CSE regs : 1.67 ( 4%) usr 0.01 ( 0%) sys 1.55 ( 3%) wall 10032 kB ( 1%) ggc scheduling 2 : 2.65 ( 6%) usr 0.02 ( 1%) sys 2.66 ( 6%) wall 1063 kB ( 0%) ggc TOTAL : 44.55 2.0546.62 747832 kB 4.6 x86_64 -m32 -O3 -fbounds-check -ftime-report df live regs : 1.24 ( 2%) usr 0.02 ( 1%) sys 1.05 ( 2%) wall 0 kB ( 0%) ggc parser: 1.05 ( 2%) usr 0.18 ( 9%) sys 1.23 ( 2%) wall 53861 kB ( 7%) ggc tree VRP : 1.48 ( 3%) usr 0.05 ( 2%) sys 1.78 ( 3%) wall 52970 kB ( 7%) ggc tree iv optimization : 9.92 (19%) usr 0.15 ( 7%) sys 9.98 (18%) wall 125735 kB (17%) ggc CSE : 1.46 ( 3%) usr 0.00 ( 0%) sys 1.42 ( 3%) wall 329 kB ( 0%) ggc combiner : 1.41 ( 3%) usr 0.01 ( 0%) sys 1.35 ( 2%) wall 20981 kB ( 3%) ggc integrated RA : 2.89 ( 6%) usr 0.00 ( 0%) sys 2.83 ( 5%) wall 14083 kB ( 2%) ggc reload: 2.59 ( 5%) usr 0.02 ( 1%) sys 2.58 ( 5%) wall 18918 kB ( 3%) ggc reload CSE regs : 2.62 ( 5%) usr 0.00 ( 0%) sys 2.91 ( 5%) wall 13557 kB ( 2%) ggc scheduling 2 : 2.49 ( 5%) usr 0.01 ( 0%) sys 2.45 ( 5%) wall 953 kB ( 0%) ggc TOTAL : 52.36 2.0254.39 744417 kB 4.5 x86_64 -m32 -O3 -fbounds-check -ftime-report df live regs : 1.41 ( 3%) usr 0.02 ( 1%) sys 1.43 ( 3%) wall 0 kB ( 0%) ggc parser: 1.02 ( 2%) usr 0.18 ( 9%) sys 1.19 ( 2%) wall 55913 kB ( 8%) ggc tree VRP : 1.44 ( 3%) usr 0.14 ( 7%) sys 1.39 ( 3%) wall 54451 kB ( 8%) ggc tree iv optimization : 7.76 (17%) usr 0.11 ( 5%) sys 8.02 (17%) wall 107362 kB (15%) ggc expand: 2.66 ( 6%) usr 0.08 ( 4%) sys 2.73 ( 6%) wall 56088 kB ( 8%) ggc CSE : 1.41 ( 3%) usr 0.00 (
[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45422 --- Comment #33 from Joost VandeVondele Joost.VandeVondele at pci dot uzh.ch 2011-01-25 09:47:10 UTC --- I just note that the timings reported by David and Jakub are not for the compile options I originally reported. With 4.6 (20110117) I now have gfortran -c -ftime-report -cpp -fbounds-check -g -O3 -ffast-math -funroll-loops -ftree-vectorize -march=native -ffree-form PR45422.F90 TOTAL : 102.15 while with the options used by David / Jakub I have timings similar to theirs. gfortran -O3 -fbounds-check -ftime-report -c PR45422.F90 TOTAL : 42.87 With 4.5 timings remain ~44s
[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45422 --- Comment #34 from Jakub Jelinek jakub at gcc dot gnu.org 2011-01-25 09:52:23 UTC --- -march=native is ambiguous, please see with -v what actually is being used.
[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45422 --- Comment #35 from Joost VandeVondele Joost.VandeVondele at pci dot uzh.ch 2011-01-25 10:03:02 UTC --- (In reply to comment #34) -march=native is ambiguous, please see with -v what actually is being used. This was mentioned in the initial comment: -march=k8-sse3 -mcx16 -msahf --param l1-cache-size=64 --param l1-cache-line-size=64 --param l2-cache-size=1024 -mtune=k8 The latest timings are on a newer machine (old one is gone now) which has: -march=amdfam10 -mcx16 -msahf -mpopcnt -mabm --param l1-cache-size=64 --param l1-cache-line-size=64 --param l2-cache-size=512 -mtune=amdfam10
[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45422 --- Comment #36 from davidxl xinliangli at gmail dot com 2011-01-25 17:28:30 UTC --- (In reply to comment #35) (In reply to comment #34) -march=native is ambiguous, please see with -v what actually is being used. This was mentioned in the initial comment: -march=k8-sse3 -mcx16 -msahf --param l1-cache-size=64 --param l1-cache-line-size=64 --param l2-cache-size=1024 -mtune=k8 The latest timings are on a newer machine (old one is gone now) which has: -march=amdfam10 -mcx16 -msahf -mpopcnt -mabm --param l1-cache-size=64 --param l1-cache-line-size=64 --param l2-cache-size=512 -mtune=amdfam10 I did use the options you originally posted -ftime-report -cpp -fbounds-check -g -O3 -ffast-math -funroll-loops -ftree-vectorize -march=native -ffree-form. The timing is consistently 58s on my 2.4Ghz core-2 box, and 42s on the 2.67Ghz Xeon machine.
[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45422 Jakub Jelinek jakub at gcc dot gnu.org changed: What|Removed |Added CC||jakub at gcc dot gnu.org --- Comment #28 from Jakub Jelinek jakub at gcc dot gnu.org 2011-01-21 09:50:25 UTC --- David, any progress with this?
[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45422 --- Comment #29 from davidxl xinliangli at gmail dot com 2011-01-21 16:27:43 UTC --- (In reply to comment #28) David, any progress with this? The cost function fix to make sure solution set does not become too big will be probably very involved and won't be availlable in 4.6 time frame. I will get a workaround using Richard's suggestion -- terminate the iterating loop when slow convergence is detected and some limit is reached. David
[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45422 --- Comment #30 from davidxl xinliangli at gmail dot com 2011-01-21 19:58:41 UTC --- (In reply to comment #29) (In reply to comment #28) David, any progress with this? The cost function fix to make sure solution set does not become too big will be probably very involved and won't be availlable in 4.6 time frame. I will get a workaround using Richard's suggestion -- terminate the iterating loop when slow convergence is detected and some limit is reached. David Two observations: 1) I can not reproduce the timing by Joost -- see below. Can someone else measure the time independently? 2) Limiting the iteration count of ivopt improvement loop does not help that much: from unlimited (can be ~40 in this case) to max iteration of 5 only cutdown total compile time by 2s. The following is the timing of the trunk compiler. Options: -O2 -ftime-report -cpp -fbounds-check -g -O3 -ffast-math -funroll-loops -ftree-vectorize -march=native -ffree-form parser: 0.67 ( 1%) usr 0.09 ( 6%) sys 0.77 ( 1%) wall 53556 kB ( 5%) ggc inline heuristics : 0.11 ( 0%) usr 0.00 ( 0%) sys 0.11 ( 0%) wall 0 kB ( 0%) ggc tree gimplify : 0.35 ( 1%) usr 0.03 ( 2%) sys 0.38 ( 1%) wall 48426 kB ( 4%) ggc tree eh : 0.02 ( 0%) usr 0.00 ( 0%) sys 0.02 ( 0%) wall 0 kB ( 0%) ggc tree CFG construction : 0.03 ( 0%) usr 0.00 ( 0%) sys 0.03 ( 0%) wall 11978 kB ( 1%) ggc tree CFG cleanup : 0.68 ( 1%) usr 0.02 ( 1%) sys 0.64 ( 1%) wall 2484 kB ( 0%) ggc tree VRP : 0.83 ( 1%) usr 0.02 ( 1%) sys 1.28 ( 2%) wall 64371 kB ( 6%) ggc tree copy propagation : 0.16 ( 0%) usr 0.00 ( 0%) sys 0.16 ( 0%) wall 1267 kB ( 0%) ggc tree find ref. vars : 0.06 ( 0%) usr 0.00 ( 0%) sys 0.06 ( 0%) wall 3806 kB ( 0%) ggc tree PTA : 0.82 ( 1%) usr 0.00 ( 0%) sys 0.80 ( 1%) wall 5497 kB ( 0%) ggc tree PHI insertion: 0.03 ( 0%) usr 0.00 ( 0%) sys 0.04 ( 0%) wall 3194 kB ( 0%) ggc tree SSA rewrite : 0.23 ( 0%) usr 0.01 ( 1%) sys 0.21 ( 0%) wall 14021 kB ( 1%) ggc tree SSA other: 0.06 ( 0%) usr 0.01 ( 1%) sys 0.09 ( 0%) wall 435 kB ( 0%) ggc tree SSA incremental : 0.65 ( 1%) usr 0.02 ( 1%) sys 0.65 ( 1%) wall 6735 kB ( 1%) ggc tree operand scan : 0.37 ( 1%) usr 0.14 ( 9%) sys 0.53 ( 1%) wall 47156 kB ( 4%) ggc dominator optimization: 0.38 ( 1%) usr 0.02 ( 1%) sys 0.50 ( 1%) wall 6948 kB ( 1%) ggc tree SRA : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall 0 kB ( 0%) ggc tree CCP : 0.93 ( 1%) usr 0.01 ( 1%) sys 1.02 ( 2%) wall 4975 kB ( 0%) ggc tree PHI const/copy prop: 0.00 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall 124 kB ( 0%) ggc tree split crit edges : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall 1743 kB ( 0%) ggc tree reassociation: 0.05 ( 0%) usr 0.00 ( 0%) sys 0.20 ( 0%) wall 5095 kB ( 0%) ggc tree PRE : 0.64 ( 1%) usr 0.00 ( 0%) sys 0.64 ( 1%) wall 9790 kB ( 1%) ggc tree FRE : 0.28 ( 0%) usr 0.00 ( 0%) sys 0.31 ( 0%) wall 5410 kB ( 0%) ggc tree code sinking : 0.04 ( 0%) usr 0.00 ( 0%) sys 0.05 ( 0%) wall 956 kB ( 0%) ggc tree linearize phis : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.02 ( 0%) wall 0 kB ( 0%) ggc tree forward propagate: 0.17 ( 0%) usr 0.00 ( 0%) sys 0.16 ( 0%) wall 11005 kB ( 1%) ggc tree phiprop : 0.02 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall 0 kB ( 0%) ggc tree conservative DCE : 0.04 ( 0%) usr 0.02 ( 1%) sys 0.06 ( 0%) wall 944 kB ( 0%) ggc tree aggressive DCE : 0.31 ( 0%) usr 0.03 ( 2%) sys 0.40 ( 1%) wall 15336 kB ( 1%) ggc tree DSE : 0.05 ( 0%) usr 0.00 ( 0%) sys 0.07 ( 0%) wall 225 kB ( 0%) ggc tree loop bounds : 0.16 ( 0%) usr 0.00 ( 0%) sys 0.17 ( 0%) wall 6744 kB ( 1%) ggc tree loop invariant motion: 0.05 ( 0%) usr 0.00 ( 0%) sys 0.08 ( 0%) wall 485 kB ( 0%) ggc tree canonical iv : 0.03 ( 0%) usr 0.00 ( 0%) sys 0.04 ( 0%) wall 3128 kB ( 0%) ggc scev constant prop: 0.04 ( 0%) usr 0.01 ( 1%) sys 0.03 ( 0%) wall 1924 kB ( 0%) ggc complete unrolling: 0.79 ( 1%) usr 0.05 ( 3%) sys 0.85 ( 1%) wall 91364 kB ( 8%) ggc tree vectorization: 0.34 ( 1%) usr 0.00 ( 0%) sys 0.37 ( 1%) wall 25117 kB ( 2%) ggc tree slp vectorization: 0.41 ( 1%) usr 0.00 ( 0%) sys 0.35 ( 1%) wall 19256 kB ( 2%) ggc tree loop distribution: 0.04 ( 0%) usr 0.00 ( 0%) sys 0.06 ( 0%) wall 850 kB ( 0%) ggc tree iv optimization : 11.14 (18%) usr 0.33 (22%) sys 12.24 (18%) wall 141300 kB (12%) ggc predictive commoning : 0.07 ( 0%) usr 0.00 ( 0%) sys 0.09 ( 0%) wall 2696 kB ( 0%) ggc tree loop init: 0.02 ( 0%) usr 0.00
[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45422 --- Comment #31 from davidxl xinliangli at gmail dot com 2011-01-21 20:08:11 UTC --- Comparing this timing with 4.6 results (164s), looks like many other passes become slower other than ivopt (e.g IRA increases from 3.5s to 11s etc -- ivopt only account for a small part of the 110s increase. David (In reply to comment #18) FYI, these are the 4.5 branch timings: Execution times (seconds) garbage collection: 0.47 ( 1%) usr 0.00 ( 0%) sys 0.47 ( 1%) wall 0 kB ( 0%) ggc callgraph construction: 0.05 ( 0%) usr 0.01 ( 1%) sys 0.09 ( 0%) wall 5996 kB ( 1%) ggc callgraph optimization: 0.21 ( 0%) usr 0.02 ( 1%) sys 0.26 ( 0%) wall 606 kB ( 0%) ggc ipa cp: 0.09 ( 0%) usr 0.00 ( 0%) sys 0.08 ( 0%) wall 1381 kB ( 0%) ggc ipa reference : 0.06 ( 0%) usr 0.00 ( 0%) sys 0.06 ( 0%) wall 0 kB ( 0%) ggc ipa pure const: 0.06 ( 0%) usr 0.01 ( 1%) sys 0.09 ( 0%) wall 0 kB ( 0%) ggc cfg cleanup : 0.39 ( 1%) usr 0.00 ( 0%) sys 0.51 ( 1%) wall 2459 kB ( 0%) ggc trivially dead code : 0.34 ( 1%) usr 0.00 ( 0%) sys 0.30 ( 1%) wall 0 kB ( 0%) ggc df multiple defs : 0.08 ( 0%) usr 0.00 ( 0%) sys 0.13 ( 0%) wall 0 kB ( 0%) ggc df reaching defs : 0.33 ( 1%) usr 0.00 ( 0%) sys 0.27 ( 1%) wall 0 kB ( 0%) ggc df live regs : 2.08 ( 4%) usr 0.01 ( 1%) sys 2.19 ( 4%) wall 0 kB ( 0%) ggc df liveinitialized regs: 0.98 ( 2%) usr 0.00 ( 0%) sys 0.92 ( 2%) wall 0 kB ( 0%) ggc df use-def / def-use chains: 0.24 ( 0%) usr 0.00 ( 0%) sys 0.19 ( 0%) wall 0 kB ( 0%) ggc df reg dead/unused notes: 0.93 ( 2%) usr 0.00 ( 0%) sys 1.04 ( 2%) wall 5756 kB ( 1%) ggc register information : 0.51 ( 1%) usr 0.01 ( 1%) sys 0.39 ( 1%) wall 0 kB ( 0%) ggc alias analysis: 0.78 ( 1%) usr 0.01 ( 1%) sys 0.91 ( 2%) wall 22384 kB ( 3%) ggc alias stmt walking: 0.50 ( 1%) usr 0.03 ( 2%) sys 0.38 ( 1%) wall 5563 kB ( 1%) ggc register scan : 0.13 ( 0%) usr 0.00 ( 0%) sys 0.09 ( 0%) wall 0 kB ( 0%) ggc rebuild jump labels : 0.19 ( 0%) usr 0.00 ( 0%) sys 0.19 ( 0%) wall 0 kB ( 0%) ggc parser: 0.82 ( 2%) usr 0.13 ( 9%) sys 0.94 ( 2%) wall 55603 kB ( 6%) ggc inline heuristics : 0.20 ( 0%) usr 0.01 ( 1%) sys 0.16 ( 0%) wall 0 kB ( 0%) ggc tree gimplify : 0.38 ( 1%) usr 0.03 ( 2%) sys 0.40 ( 1%) wall 46588 kB ( 5%) ggc tree eh : 0.02 ( 0%) usr 0.00 ( 0%) sys 0.02 ( 0%) wall 0 kB ( 0%) ggc tree CFG construction : 0.04 ( 0%) usr 0.02 ( 1%) sys 0.05 ( 0%) wall 11964 kB ( 1%) ggc tree CFG cleanup : 0.47 ( 1%) usr 0.00 ( 0%) sys 0.79 ( 1%) wall 1829 kB ( 0%) ggc tree VRP : 1.46 ( 3%) usr 0.05 ( 4%) sys 1.27 ( 2%) wall 56376 kB ( 6%) ggc tree copy propagation : 0.09 ( 0%) usr 0.02 ( 1%) sys 0.22 ( 0%) wall 746 kB ( 0%) ggc tree find ref. vars : 0.09 ( 0%) usr 0.01 ( 1%) sys 0.07 ( 0%) wall 3806 kB ( 0%) ggc tree PTA : 0.30 ( 1%) usr 0.00 ( 0%) sys 0.33 ( 1%) wall 3836 kB ( 0%) ggc tree PHI insertion: 0.00 ( 0%) usr 0.00 ( 0%) sys 0.04 ( 0%) wall 3194 kB ( 0%) ggc tree SSA rewrite : 0.24 ( 0%) usr 0.01 ( 1%) sys 0.29 ( 1%) wall 13860 kB ( 2%) ggc tree SSA other: 0.13 ( 0%) usr 0.02 ( 1%) sys 0.11 ( 0%) wall 418 kB ( 0%) ggc tree SSA incremental : 0.89 ( 2%) usr 0.06 ( 4%) sys 0.97 ( 2%) wall 6811 kB ( 1%) ggc tree operand scan : 0.34 ( 1%) usr 0.23 (17%) sys 0.59 ( 1%) wall 44776 kB ( 5%) ggc dominator optimization: 0.29 ( 1%) usr 0.01 ( 1%) sys 0.35 ( 1%) wall 5152 kB ( 1%) ggc tree CCP : 0.51 ( 1%) usr 0.02 ( 1%) sys 0.43 ( 1%) wall 4620 kB ( 1%) ggc tree PHI const/copy prop: 0.01 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall 106 kB ( 0%) ggc tree split crit edges : 0.00 ( 0%) usr 0.00 ( 0%) sys 0.00 ( 0%) wall 2019 kB ( 0%) ggc tree reassociation: 0.12 ( 0%) usr 0.01 ( 1%) sys 0.12 ( 0%) wall 2946 kB ( 0%) ggc tree PRE : 0.92 ( 2%) usr 0.00 ( 0%) sys 0.95 ( 2%) wall 7315 kB ( 1%) ggc tree FRE : 0.45 ( 1%) usr 0.04 ( 3%) sys 0.35 ( 1%) wall 5518 kB ( 1%) ggc tree code sinking : 0.03 ( 0%) usr 0.00 ( 0%) sys 0.03 ( 0%) wall 1400 kB ( 0%) ggc tree linearize phis : 0.02 ( 0%) usr 0.01 ( 1%) sys 0.01 ( 0%) wall 0 kB ( 0%) ggc tree forward propagate: 0.18 ( 0%) usr 0.02 ( 1%) sys 0.16 ( 0%) wall 10006 kB ( 1%) ggc tree conservative DCE : 0.05 ( 0%) usr 0.01 ( 1%) sys 0.13 (
[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45422 Joost VandeVondele Joost.VandeVondele at pci dot uzh.ch changed: What|Removed |Added Last reconfirmed|2010-08-29 09:25:52 |2011-01-17 9:25:52 --- Comment #27 from Joost VandeVondele Joost.VandeVondele at pci dot uzh.ch 2011-01-17 11:38:36 UTC --- timings with current trunk (release checking). out.4_3 TOTAL : 34.620.43 35.27 837034 kB out.4_5 TOTAL : 45.300.70 46.02 897447 kB out.trunk TOTAL : 165.890.99 166.971743679 kB so time is up by 5x memory 2x relative to 4.3.
[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
-- rguenth at gcc dot gnu dot org changed: What|Removed |Added Priority|P3 |P1 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45422
[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
--- Comment #26 from davidxl at gcc dot gnu dot org 2010-08-31 17:45 --- Good observation re. the number of IVs in the final set. This usually points to some problem/bug in the cost function. I briefly looked at this case -- it indeed exposes two more bugs in the cost model: 1) the computation cost of the all the cost pairs in an assignment can actually not simply be added together, because many rewrite expressions can be commoned. We now have the mechanism to compute with common loop invariants for register pressure estimation, and this mechnasim needs to be extended for computation cost. 2) the offset is not stripped when computing loop invariant expression ids -- this can cause problem in overestimating reg pressure. (The case arises more often with loop unrolling). David -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45422
[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
--- Comment #23 from rguenth at gcc dot gnu dot org 2010-08-30 07:11 --- (In reply to comment #22) Given the fact that the solution space is really large -- M^N where M is the number of candidates and M is the number of uses (here M == 70 and N == 48), and the cost function is complicated, it will be challenging to come up with algorithm that converges really fast, and most importantly -- 'guarantees' an optimal solution.. Well - we can't guarantee an optimal solution. We have to take compile-time into account which means that O(M^N) is not acceptable but we need to come up with something that can complete in O((M+N) log (M+N)) time at most. I btw doubt that the solution found is anywhere near optimal for 32bit x86 - using 15 IVs instead of 2 can't be cheaper. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45422
[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
--- Comment #24 from rguenth at gcc dot gnu dot org 2010-08-30 07:12 --- (In reply to comment #20) (In reply to comment #16) adjust summary according to the last timings I am surprised to see such big differences between trunk and previous releases. Compiling this test case with the those options on my core2 box (2.4GHz ) took only 56seconds which is comparable with the timing with a 4.4.3 compiler (with google local patches including ivopt improvements). Of course - because the ivopt improvement patches are the problem. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45422
[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
--- Comment #25 from davidxl at gcc dot gnu dot org 2010-08-30 16:41 --- (In reply to comment #24) (In reply to comment #20) (In reply to comment #16) adjust summary according to the last timings I am surprised to see such big differences between trunk and previous releases. Compiling this test case with the those options on my core2 box (2.4GHz ) took only 56seconds which is comparable with the timing with a 4.4.3 compiler (with google local patches including ivopt improvements). Of course - because the ivopt improvement patches are the problem. It is just the total time diff from Joost's measure can be just explained by ivopt component. David -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45422
[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
--- Comment #16 from jv244 at cam dot ac dot uk 2010-08-29 06:38 --- adjust summary according to the last timings -- jv244 at cam dot ac dot uk changed: What|Removed |Added Last reconfirmed|2010-08-29 05:31:37 |2010-08-29 06:38:26 date|| Summary|[4.6 Regression] compile|[4.6 Regression] compile |time increases 5x. |time increases 3x. http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45422
[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
--- Comment #17 from rguenth at gcc dot gnu dot org 2010-08-29 09:25 --- tree iv optimization : 32.57 (20%) usr 0.10 ( 5%) sys 32.73 (20%) wall 322095 kB (18%) ggc 20% is still completely unreasonable for IV optimization. -- rguenth at gcc dot gnu dot org changed: What|Removed |Added Status|WAITING |NEW Last reconfirmed|2010-08-29 06:38:26 |2010-08-29 09:25:52 date|| http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45422
[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
--- Comment #18 from jv244 at cam dot ac dot uk 2010-08-29 15:07 --- FYI, these are the 4.5 branch timings: Execution times (seconds) garbage collection: 0.47 ( 1%) usr 0.00 ( 0%) sys 0.47 ( 1%) wall 0 kB ( 0%) ggc callgraph construction: 0.05 ( 0%) usr 0.01 ( 1%) sys 0.09 ( 0%) wall 5996 kB ( 1%) ggc callgraph optimization: 0.21 ( 0%) usr 0.02 ( 1%) sys 0.26 ( 0%) wall 606 kB ( 0%) ggc ipa cp: 0.09 ( 0%) usr 0.00 ( 0%) sys 0.08 ( 0%) wall 1381 kB ( 0%) ggc ipa reference : 0.06 ( 0%) usr 0.00 ( 0%) sys 0.06 ( 0%) wall 0 kB ( 0%) ggc ipa pure const: 0.06 ( 0%) usr 0.01 ( 1%) sys 0.09 ( 0%) wall 0 kB ( 0%) ggc cfg cleanup : 0.39 ( 1%) usr 0.00 ( 0%) sys 0.51 ( 1%) wall 2459 kB ( 0%) ggc trivially dead code : 0.34 ( 1%) usr 0.00 ( 0%) sys 0.30 ( 1%) wall 0 kB ( 0%) ggc df multiple defs : 0.08 ( 0%) usr 0.00 ( 0%) sys 0.13 ( 0%) wall 0 kB ( 0%) ggc df reaching defs : 0.33 ( 1%) usr 0.00 ( 0%) sys 0.27 ( 1%) wall 0 kB ( 0%) ggc df live regs : 2.08 ( 4%) usr 0.01 ( 1%) sys 2.19 ( 4%) wall 0 kB ( 0%) ggc df liveinitialized regs: 0.98 ( 2%) usr 0.00 ( 0%) sys 0.92 ( 2%) wall 0 kB ( 0%) ggc df use-def / def-use chains: 0.24 ( 0%) usr 0.00 ( 0%) sys 0.19 ( 0%) wall 0 kB ( 0%) ggc df reg dead/unused notes: 0.93 ( 2%) usr 0.00 ( 0%) sys 1.04 ( 2%) wall 5756 kB ( 1%) ggc register information : 0.51 ( 1%) usr 0.01 ( 1%) sys 0.39 ( 1%) wall 0 kB ( 0%) ggc alias analysis: 0.78 ( 1%) usr 0.01 ( 1%) sys 0.91 ( 2%) wall 22384 kB ( 3%) ggc alias stmt walking: 0.50 ( 1%) usr 0.03 ( 2%) sys 0.38 ( 1%) wall 5563 kB ( 1%) ggc register scan : 0.13 ( 0%) usr 0.00 ( 0%) sys 0.09 ( 0%) wall 0 kB ( 0%) ggc rebuild jump labels : 0.19 ( 0%) usr 0.00 ( 0%) sys 0.19 ( 0%) wall 0 kB ( 0%) ggc parser: 0.82 ( 2%) usr 0.13 ( 9%) sys 0.94 ( 2%) wall 55603 kB ( 6%) ggc inline heuristics : 0.20 ( 0%) usr 0.01 ( 1%) sys 0.16 ( 0%) wall 0 kB ( 0%) ggc tree gimplify : 0.38 ( 1%) usr 0.03 ( 2%) sys 0.40 ( 1%) wall 46588 kB ( 5%) ggc tree eh : 0.02 ( 0%) usr 0.00 ( 0%) sys 0.02 ( 0%) wall 0 kB ( 0%) ggc tree CFG construction : 0.04 ( 0%) usr 0.02 ( 1%) sys 0.05 ( 0%) wall 11964 kB ( 1%) ggc tree CFG cleanup : 0.47 ( 1%) usr 0.00 ( 0%) sys 0.79 ( 1%) wall 1829 kB ( 0%) ggc tree VRP : 1.46 ( 3%) usr 0.05 ( 4%) sys 1.27 ( 2%) wall 56376 kB ( 6%) ggc tree copy propagation : 0.09 ( 0%) usr 0.02 ( 1%) sys 0.22 ( 0%) wall 746 kB ( 0%) ggc tree find ref. vars : 0.09 ( 0%) usr 0.01 ( 1%) sys 0.07 ( 0%) wall 3806 kB ( 0%) ggc tree PTA : 0.30 ( 1%) usr 0.00 ( 0%) sys 0.33 ( 1%) wall 3836 kB ( 0%) ggc tree PHI insertion: 0.00 ( 0%) usr 0.00 ( 0%) sys 0.04 ( 0%) wall 3194 kB ( 0%) ggc tree SSA rewrite : 0.24 ( 0%) usr 0.01 ( 1%) sys 0.29 ( 1%) wall 13860 kB ( 2%) ggc tree SSA other: 0.13 ( 0%) usr 0.02 ( 1%) sys 0.11 ( 0%) wall 418 kB ( 0%) ggc tree SSA incremental : 0.89 ( 2%) usr 0.06 ( 4%) sys 0.97 ( 2%) wall 6811 kB ( 1%) ggc tree operand scan : 0.34 ( 1%) usr 0.23 (17%) sys 0.59 ( 1%) wall 44776 kB ( 5%) ggc dominator optimization: 0.29 ( 1%) usr 0.01 ( 1%) sys 0.35 ( 1%) wall 5152 kB ( 1%) ggc tree CCP : 0.51 ( 1%) usr 0.02 ( 1%) sys 0.43 ( 1%) wall 4620 kB ( 1%) ggc tree PHI const/copy prop: 0.01 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall 106 kB ( 0%) ggc tree split crit edges : 0.00 ( 0%) usr 0.00 ( 0%) sys 0.00 ( 0%) wall 2019 kB ( 0%) ggc tree reassociation: 0.12 ( 0%) usr 0.01 ( 1%) sys 0.12 ( 0%) wall 2946 kB ( 0%) ggc tree PRE : 0.92 ( 2%) usr 0.00 ( 0%) sys 0.95 ( 2%) wall 7315 kB ( 1%) ggc tree FRE : 0.45 ( 1%) usr 0.04 ( 3%) sys 0.35 ( 1%) wall 5518 kB ( 1%) ggc tree code sinking : 0.03 ( 0%) usr 0.00 ( 0%) sys 0.03 ( 0%) wall 1400 kB ( 0%) ggc tree linearize phis : 0.02 ( 0%) usr 0.01 ( 1%) sys 0.01 ( 0%) wall 0 kB ( 0%) ggc tree forward propagate: 0.18 ( 0%) usr 0.02 ( 1%) sys 0.16 ( 0%) wall 10006 kB ( 1%) ggc tree conservative DCE : 0.05 ( 0%) usr 0.01 ( 1%) sys 0.13 ( 0%) wall 576 kB ( 0%) ggc tree aggressive DCE : 0.28 ( 1%) usr 0.01 ( 1%) sys 0.37 ( 1%) wall 8853 kB ( 1%) ggc tree buildin call DCE : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.00 ( 0%) wall 0 kB ( 0%) ggc tree DSE : 0.20 ( 0%) usr 0.00 ( 0%) sys 0.11 ( 0%) wall 132 kB ( 0%) ggc PHI merge : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.00 ( 0%) wall 37 kB ( 0%) ggc tree loop bounds : 0.22 ( 0%)
[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
--- Comment #20 from davidxl at gcc dot gnu dot org 2010-08-30 03:10 --- (In reply to comment #16) adjust summary according to the last timings I am surprised to see such big differences between trunk and previous releases. Compiling this test case with the those options on my core2 box (2.4GHz ) took only 56seconds which is comparable with the timing with a 4.4.3 compiler (with google local patches including ivopt improvements). David -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45422
[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
--- Comment #21 from davidxl at gcc dot gnu dot org 2010-08-30 03:19 --- (In reply to comment #17) tree iv optimization : 32.57 (20%) usr 0.10 ( 5%) sys 32.73 (20%) wall 322095 kB (18%) ggc 20% is still completely unreasonable for IV optimization. There was a patch in trunk that may double the time in ivopt -- i.e. find_optimal_iv_set_1 is done twice, one with the original iv set while the other with full set. This probably needs to be revisited. David -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45422
