[Bug ipa/96337] [10/11 Regression] GCC 10.2: twice as slow for -O2 -march=x86-64 vs. GCC 9.3/8.4

[hubicka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96337

--- Comment #8 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
This is the built withour release flags override as seems to be done by
phoronix:

GCC 9:
y4m  [info]: 1920x1080 fps 30/1 i420p8 frames 0 - 599 of 600
raw  [info]: output file: /dev/null
x265 [info]: HEVC encoder version 3.1.2+1-76650bab70f9
x265 [info]: build info [Linux][GCC 9.3.1][64 bit][noasm] 8bit
x265 [info]: using cpu capabilities: none!
x265 [info]: Main profile, Level-4 (Main tier)
x265 [info]: Thread pool created using 4 threads
x265 [info]: Slices                              : 1
x265 [info]: frame threads / pool features       : 2 / wpp(17 rows)
x265 [info]: Coding QT: max CU size, min CU size : 64 / 8
x265 [info]: Residual QT: max TU size, max depth : 32 / 1 inter / 1 intra
x265 [info]: ME / range / subpel / merge         : hex / 57 / 2 / 3
x265 [info]: Keyframe min / max / scenecut / bias: 25 / 250 / 40 / 5.00
x265 [info]: Lookahead / bframes / badapt        : 20 / 4 / 2
x265 [info]: b-pyramid / weightp / weightb       : 1 / 1 / 0
x265 [info]: References / ref-limit  cu / depth  : 3 / off / on
x265 [info]: AQ: mode / str / qg-size / cu-tree  : 2 / 1.0 / 32 / 1
x265 [info]: Rate Control / qCompress            : CRF-28.0 / 0.60
x265 [info]: tools: rd=3 psy-rd=2.00 early-skip rskip signhide tmvp b-intra
x265 [info]: tools: strong-intra-smoothing lslices=6 deblock sao
x265 [info]: frame I:      3, Avg QP:27.57  kb/s: 14018.64                      
x265 [info]: frame P:    146, Avg QP:28.84  kb/s: 4313.98 
x265 [info]: frame B:    451, Avg QP:35.29  kb/s: 204.06  
x265 [info]: Weighted P-Frames: Y:0.0% UV:0.0%
x265 [info]: consecutive B-frames: 0.7% 0.0% 0.0% 94.6% 4.7% 

encoded 600 frames in 171.30s (3.50 fps), 1273.22 kb/s, Avg QP:33.68
599.58user 1.62system 2:51.33elapsed 350%CPU (0avgtext+0avgdata
416976maxresident)k
225384inputs+0outputs (0major+95380minor)pagefaults 0swaps

GCC 10:
y4m  [info]: 1920x1080 fps 30/1 i420p8 frames 0 - 599 of 600
raw  [info]: output file: /dev/null
x265 [info]: HEVC encoder version 3.1.2+1-76650bab70f9
x265 [info]: build info [Linux][GCC 10.1.1][64 bit][noasm] 8bit
x265 [info]: using cpu capabilities: none!
x265 [info]: Main profile, Level-4 (Main tier)
x265 [info]: Thread pool created using 4 threads
x265 [info]: Slices                              : 1
x265 [info]: frame threads / pool features       : 2 / wpp(17 rows)
x265 [info]: Coding QT: max CU size, min CU size : 64 / 8
x265 [info]: Residual QT: max TU size, max depth : 32 / 1 inter / 1 intra
x265 [info]: ME / range / subpel / merge         : hex / 57 / 2 / 3
x265 [info]: Keyframe min / max / scenecut / bias: 25 / 250 / 40 / 5.00
x265 [info]: Lookahead / bframes / badapt        : 20 / 4 / 2
x265 [info]: b-pyramid / weightp / weightb       : 1 / 1 / 0
x265 [info]: References / ref-limit  cu / depth  : 3 / off / on
x265 [info]: AQ: mode / str / qg-size / cu-tree  : 2 / 1.0 / 32 / 1
x265 [info]: Rate Control / qCompress            : CRF-28.0 / 0.60
x265 [info]: tools: rd=3 psy-rd=2.00 early-skip rskip signhide tmvp b-intra
x265 [info]: tools: strong-intra-smoothing lslices=6 deblock sao
x265 [info]: frame I:      3, Avg QP:27.57  kb/s: 14018.64                      
x265 [info]: frame P:    146, Avg QP:28.84  kb/s: 4313.98 
x265 [info]: frame B:    451, Avg QP:35.29  kb/s: 204.06  
x265 [info]: Weighted P-Frames: Y:0.0% UV:0.0%
x265 [info]: consecutive B-frames: 0.7% 0.0% 0.0% 94.6% 4.7% 

encoded 600 frames in 168.97s (3.55 fps), 1273.22 kb/s, Avg QP:33.68
592.69user 1.89system 2:49.00elapsed 351%CPU (0avgtext+0avgdata
416184maxresident)k
476408inputs+0outputs (1major+95191minor)pagefaults 0swaps

So a small improvement.