x264 --threads 2 --crf 20 -b3 -r4 -m6 -t1 -8 -w --b-rdo --mixed-refs --me umh --merange 12
CPU: Core 2, speed 2400.75 MHz (estimated)
Counted CPU_CLK_UNHALTED events (Clock cycles when not halted) with a unit mask of 0x00 (Unhalted core cycles) count 100000
samples  %        symbol name
11659572 25.2962  pixel_sad_*_mmx
7030913  15.2541  pixel_satd_*_mmx
3417912   7.4155  pixel_avg_*_mmx
2983057   6.4719  me_search_ref
2303283   4.9971  mc_chroma_mmx
2004425   4.3487  quant_trellis_cabac
1299367   2.8191  macroblock_encode
1261859   2.7376  block_residual_write_cabac
1130087   2.4518  refine_subpel
968260    2.1006  dct_*_mmx
892915    1.9372  get_ref_mmx
696490    1.5111  cabac_size_decision
638272    1.3847  zigzag_scan_*
635907    1.3796  mb_encode_8x8_chroma
628438    1.3635  mb_predict_mv_*
617196    1.3390  predict_intra_*
587410    1.2744  dequant_*_mmx
479187    1.0396  pixel_sa8d_*_mmx
434150    0.9420  idct_*_mmx
389361    0.8447  macroblock_cache_load
388074    0.8420  hpel_filter_mmx
369224    0.8011  mb_analyse_intra_*
359333    0.7796  quant_*_mmx
349169    0.7575  macroblock_size_cabac
323632    0.7021  pixel_ssd_*_mmx
313496    0.6801  mb_analyse_inter_*
305625    0.6631  macroblock_cache_save
305018    0.6618  frame_init_lowres
291058    0.6315  mc_copy_*_mmx
272469    0.5911  cabac_encode_decision
271118    0.5883  mb_mc_*
266287    0.5777  macroblock_analyse
251281    0.5452  analyse_update_cache
202119    0.4386  cabac_mb_mvd
173994    0.3775  frame_deblock_row
163174    0.3540  plane_copy_mmx
133649    0.2900  cabac_size_decision_noup
121308    0.2633  deblock_*_mmx
117640    0.2552  mc_luma_mmx
107665    0.2336  slicetype_mb_cost
99981     0.2169  predict_8x8_filter
80173     0.1739  mb_encode_i*
76440     0.1658  macroblock_write_cabac
76012     0.1649  cabac_size_decision2
68867     0.1494  cabac_mb_type
58684     0.1273  deblock_*_c
55166     0.1197  mb_predict_intra4x4_mode
53330     0.1157  slices_write
47315     0.1027  mb_analyse_*_rd
42898     0.0931  macroblock_probe_skip
42454     0.0921  rd_cost_mb
30975     0.0672  mb_load_mv_direct8x8
25404     0.0551  .plt
22827     0.0495  cabac_mb_intra4x4_pred_mode
19536     0.0424  plane_expand_border
18740     0.0407  prefetch_fenc_mmx
18091     0.0392  cabac_encode_bypass
16955     0.0368  prefetch_ref_mmx
11587     0.0252  cabac_mb_ref
11275     0.0245  cabac_mb_skip
10127     0.0220  cabac_mb8x8_mvd
8752      0.0190  ratecontrol_qp
8032      0.0174  cabac_encode_terminal
5737      0.0124  mb_cache_mv_*
4853      0.0105  slicetype_frame_cost
