Profiling results ----------------- Total cpu time observed: 15172ms (out of 15504ms) Number of samples taken: 56 (once every 271ms) ======================================================================= Caller Idx Total Self Name+src Local% ms(pct) ms(pct) Callee ======================================================================= ??? [7] 100.0% [1] 15172(100.0%) 0(0.0%) profile-thunk16 ...e/pkgs/profile-lib/main.rkt:9:0 run [5] 100.0% ----------------------------------------------------------------------- hash-ref! [60] 100.0% [2] 332(2.2%) 0(0.0%) ??? ...ies/herbie/master/src/core/taylor.rkt:68:15 hash-ref! [60] 50.0% ??? [50] 50.0% ----------------------------------------------------------------------- ??? [50] 100.0% [3] 332(2.2%) 0(0.0%) approximate9 ...ie/master/src/core/taylor.rkt:12:0 loop [6] 100.0% ----------------------------------------------------------------------- hash-ref! [60] 100.0% [4] 332(2.2%) 0(0.0%) simplify ...herbie/master/src/core/reduce.rkt:16:0 parse-loop30 [68] 100.0% ----------------------------------------------------------------------- profile-thunk16 [1] 100.0% [5] 15172(100.0%) 0(0.0%) run ...et-7.0/share/pkgs/profile-lib/main.rkt:39:2 ??? [7] 100.0% ----------------------------------------------------------------------- approximate9 [3] 100.0% [6] 332(2.2%) 0(0.0%) loop ...ies/herbie/master/src/core/taylor.rkt:87:4 hash-ref! [60] 100.0% ----------------------------------------------------------------------- for-loop [53] 1.1% run [5] 49.5% [7] 15172(100.0%) 250(1.6%) ??? ...lects/racket/private/more-scheme.rkt:261:28 profile-thunk16 [1] 49.5% run-improve47 [8] 33.4% prepare-points [9] 13.1% eval-errors [10] 1.6% oracle-error [11] 0.9% errors [42] 0.5% infer-double-representation [12] 0.5% ----------------------------------------------------------------------- ??? [7] 100.0% [8] 10212(67.3%) 0(0.0%) run-improve47 ...bie/master/src/mainloop.rkt:342:0 for-loop [13] 100.0% ----------------------------------------------------------------------- ??? [7] 100.0% [9] 3964(26.1%) 0(0.0%) prepare-points ...rbie/master/src/points.rkt:146:0 loop [14] 100.0% ----------------------------------------------------------------------- ??? [7] 100.0% [10] 492(3.2%) 0(0.0%) eval-errors .../herbie/master/src/points.rkt:179:0 for-loop [15] 100.0% ----------------------------------------------------------------------- ??? [7] 100.0% [11] 260(1.7%) 0(0.0%) oracle-error ...herbie/master/src/points.rkt:188:0 for-loop [16] 100.0% ----------------------------------------------------------------------- ??? [7] 100.0% [12] 244(1.6%) 0(0.0%) infer-double-representation .../src/float.rkt:22:0 for-loop [17] 100.0% ----------------------------------------------------------------------- run-improve47 [8] 100.0% [13] 10212(67.3%) 0(0.0%) for-loop ...s/herbie/master/src/mainloop.rkt:359:4 run-iter! [18] 100.0% ----------------------------------------------------------------------- prepare-points [9] 100.0% [14] 3964(26.1%) 0(0.0%) loop ...ghtlies/herbie/master/src/points.rkt:122:4 loop [19] 59.3% ??? [20] 33.4% infer-representation [37] 7.3% ----------------------------------------------------------------------- eval-errors [10] 100.0% [15] 492(3.2%) 250(1.6%) for-loop ...ies/herbie/master/src/points.rkt:181:2 ulp-difference [22] 49.2% ----------------------------------------------------------------------- oracle-error [11] 100.0% [16] 260(1.7%) 0(0.0%) for-loop ...ies/herbie/master/src/points.rkt:189:2 map [79] 100.0% ----------------------------------------------------------------------- infer-double-representation [12]100.0% [17] 244(1.6%) 0(0.0%) for-loop ...tlies/herbie/master/src/float.rkt:17:3 return/no-unsupplied [21] 100.0% ----------------------------------------------------------------------- for-loop [13] 100.0% [18] 10212(67.3%) 0(0.0%) run-iter! .../herbie/master/src/mainloop.rkt:323:0 simplify! [23] 83.5% finalize-iter! [25] 9.8% localize! [26] 3.5% gen-series! [27] 3.3% ----------------------------------------------------------------------- loop [14] 100.0% [19] 2352(15.5%) 510(3.4%) loop ...ightlies/herbie/master/src/points.rkt:81:2 ??? [24] 66.9% ??? [28] 11.4% ----------------------------------------------------------------------- loop [14] 100.0% [20] 1322(8.7%) 824(5.4%) ??? ...ightlies/herbie/master/src/points.rkt:106:2 ??? [50] 37.7% ----------------------------------------------------------------------- for-loop [17] 100.0% [21] 244(1.6%) 244(1.6%) return/no-unsupplied ...ct/private/arr-i.rkt:534:0 ----------------------------------------------------------------------- for-loop [15] 100.0% [22] 242(1.6%) 242(1.6%) ulp-difference ...herbie/master/src/float.rkt:35:0 ----------------------------------------------------------------------- run-iter! [18] 100.0% [23] 8524(56.2%) 0(0.0%) simplify! .../herbie/master/src/mainloop.rkt:220:0 ??? [29] 100.0% ----------------------------------------------------------------------- ??? [90] 14.2% loop [19] 85.8% [24] 1834(12.1%) 278(1.8%) ??? ...htlies/herbie/master/src/programs.rkt:108:2 ??? [31] 55.4% ??? [50] 15.3% real->precision [34] 14.2% ----------------------------------------------------------------------- run-iter! [18] 100.0% [25] 1000(6.6%) 0(0.0%) finalize-iter! ...ie/master/src/mainloop.rkt:274:0 ??? [30] 100.0% ----------------------------------------------------------------------- run-iter! [18] 100.0% [26] 356(2.3%) 0(0.0%) localize! .../herbie/master/src/mainloop.rkt:123:0 localize-error [32] 100.0% ----------------------------------------------------------------------- run-iter! [18] 100.0% [27] 332(2.2%) 0(0.0%) gen-series! ...erbie/master/src/mainloop.rkt:156:0 for-loop [33] 100.0% ----------------------------------------------------------------------- loop [19] 100.0% [28] 268(1.8%) 268(1.8%) ??? /opt/racket-7.0/collects/ffi/unsafe.rkt:898:4 ----------------------------------------------------------------------- simplify! [23] 100.0% [29] 8524(56.2%) 0(0.0%) ??? ...es/herbie/master/src/core/simplify.rkt:26:0 for-loop [35] 56.5% one-iter [41] 40.5% loop [40] 3.1% ----------------------------------------------------------------------- match-e [67] 20.1% finalize-iter! [25] 79.9% [30] 1252(8.3%) 252(1.7%) ??? ...contract/private/arrow-val-first.rkt:388:18 for-loop [36] 79.9% ----------------------------------------------------------------------- ??? [24] 100.0% [31] 1016(6.7%) 248(1.6%) ??? ...t-7.0/collects/racket/private/kw.rkt:592:14 ??? [38] 48.4% ??? [50] 27.2% ----------------------------------------------------------------------- localize! [26] 100.0% [32] 356(2.3%) 0(0.0%) localize-error ...aster/src/core/localize.rkt:61:0 hash-ref! [60] 100.0% ----------------------------------------------------------------------- gen-series! [27] 100.0% [33] 332(2.2%) 0(0.0%) for-loop ...s/herbie/master/src/mainloop.rkt:163:7 taylor-alt [39] 100.0% ----------------------------------------------------------------------- ??? [24] 100.0% [34] 260(1.7%) 0(0.0%) real->precision ...e/master/src/programs.rkt:87:33 infer-representation [37] 100.0% ----------------------------------------------------------------------- ??? [29] 100.0% [35] 4814(31.7%) 0(0.0%) for-loop ...rbie/master/src/core/simplify.rkt:33:2 one-iter [41] 100.0% ----------------------------------------------------------------------- ??? [30] 100.0% [36] 1000(6.6%) 0(0.0%) for-loop ...bie/master/src/core/alt-table.rkt:56:2 errors [42] 50.0% loop [52] 25.0% atab-add-altn [46] 25.0% ----------------------------------------------------------------------- real->precision [34] 47.3% loop [14] 52.7% [37] 550(3.6%) 550(3.6%) infer-representation .../master/src/float.rkt:15:0 ----------------------------------------------------------------------- ??? [31] 100.0% [38] 492(3.2%) 0(0.0%) ??? ...tract/private/arrow-higher-order.rkt:361:33 ival-div [45] 50.8% ival-sub [47] 49.2% ----------------------------------------------------------------------- for-loop [33] 100.0% [39] 332(2.2%) 0(0.0%) taylor-alt ...herbie/master/src/mainloop.rkt:142:0 for-loop [43] 100.0% ----------------------------------------------------------------------- ??? [29] 100.0% [40] 260(1.7%) 0(0.0%) loop .../herbie/master/src/core/simplify.rkt:104:2 for-loop [44] 100.0% ----------------------------------------------------------------------- ??? [29] 41.7% for-loop [35] 58.3% [41] 8264(54.5%) 0(0.0%) one-iter ...rbie/master/src/core/simplify.rkt:65:0 find-matches [48] 69.8% for-loop [49] 22.8% for-loop [54] 3.9% for-loop [55] 3.5% ----------------------------------------------------------------------- ??? [7] 32.8% for-loop [36] 67.2% [42] 744(4.9%) 0(0.0%) errors ...tlies/herbie/master/src/points.rkt:205:0 for-loop [53] 66.4% eval-prog [51] 33.6% ----------------------------------------------------------------------- taylor-alt [39] 100.0% [43] 332(2.2%) 0(0.0%) for-loop ...s/herbie/master/src/mainloop.rkt:148:6 ??? [50] 100.0% ----------------------------------------------------------------------- loop [40] 100.0% [44] 260(1.7%) 0(0.0%) for-loop ...bie/master/src/core/simplify.rkt:110:4 for-loop [56] 100.0% ----------------------------------------------------------------------- ??? [38] 100.0% [45] 250(1.6%) 0(0.0%) ival-div ...erbie/master/src/biginterval.rkt:148:0 bfdiv [57] 100.0% ----------------------------------------------------------------------- for-loop [36] 100.0% [46] 250(1.6%) 0(0.0%) atab-add-altn ...ster/src/core/alt-table.rkt:203:0 loop [52] 100.0% ----------------------------------------------------------------------- ??? [38] 100.0% [47] 242(1.6%) 242(1.6%) ival-sub ...erbie/master/src/biginterval.rkt:100:0 ----------------------------------------------------------------------- one-iter [41] 100.0% [48] 5768(38.0%) 0(0.0%) find-matches .../master/src/core/simplify.rkt:55:0 for-loop [58] 100.0% ----------------------------------------------------------------------- one-iter [41] 100.0% [49] 1884(12.4%) 338(2.2%) for-loop ...rbie/master/src/core/simplify.rkt:67:2 for-loop [59] 82.1% ----------------------------------------------------------------------- ??? [2] 8.0% location-do [63] 8.0% for-loop [43] 8.0% ??? [31] 19.9% ??? [24] 20.2% ??? [20] 35.9% [50] 1386(9.1%) 276(1.8%) ??? ...tract/private/arrow-higher-order.rkt:357:33 sample-multi-bounded [62] 35.9% mk-ival [65] 20.2% location-do [63] 8.0% approximate9 [3] 8.0% hash-ref! [60] 8.0% ----------------------------------------------------------------------- errors [42] 43.0% eval-const-expr [83] 57.0% [51] 582(3.8%) 0(0.0%) eval-prog ...s/herbie/master/src/programs.rkt:83:0 temp68_2 [61] 100.0% ----------------------------------------------------------------------- atab-add-altn [46] 50.0% for-loop [36] 50.0% [52] 500(3.3%) 500(3.3%) loop ...-7.0/collects/racket/private/hash.rkt:20:4 ----------------------------------------------------------------------- errors [42] 100.0% [53] 494(3.3%) 0(0.0%) for-loop ...ies/herbie/master/src/points.rkt:207:2 ??? [7] 100.0% ----------------------------------------------------------------------- one-iter [41] 100.0% [54] 326(2.1%) 0(0.0%) for-loop ...rbie/master/src/core/simplify.rkt:72:2 set-precompute! [64] 100.0% ----------------------------------------------------------------------- one-iter [41] 100.0% [55] 286(1.9%) 0(0.0%) for-loop ...rbie/master/src/core/simplify.rkt:75:2 update-leader! [78] 100.0% ----------------------------------------------------------------------- for-loop [44] 100.0% [56] 260(1.7%) 0(0.0%) for-loop ...ie/master/src/core/simplify.rkt:114:16 for-loop [66] 100.0% ----------------------------------------------------------------------- ival-div [45] 100.0% [57] 250(1.6%) 250(1.6%) bfdiv ...-lib/math/private/bigfloat/mpfr.rkt:821:4 ----------------------------------------------------------------------- for-loop [58] 47.3% find-matches [48] 52.7% [58] 5768(38.0%) 582(3.8%) for-loop ...rbie/master/src/core/simplify.rkt:57:8 for-loop [58] 47.3% match-e [67] 45.0% ----------------------------------------------------------------------- for-loop [49] 100.0% [59] 1546(10.2%) 0(0.0%) for-loop ...rbie/master/src/core/simplify.rkt:70:4 merge-egraph-nodes! [69] 40.1% dedup-children! [70] 38.3% substitute-e [73] 21.6% ----------------------------------------------------------------------- ??? [74] 9.7% ??? [75] 9.7% ??? [50] 9.7% ??? [2] 9.7% loop [6] 9.7% localize-error [32] 51.7% [60] 688(4.5%) 0(0.0%) hash-ref! .../racket/private/more-scheme.rkt:376:2 parse-loop30 [68] 51.7% ??? [2] 19.3% ??? [75] 9.7% ??? [74] 9.7% simplify [4] 9.7% ----------------------------------------------------------------------- eval-prog [51] 100.0% [61] 582(3.8%) 0(0.0%) temp68_2 (unknown source) compile16 [71] 100.0% ----------------------------------------------------------------------- ??? [50] 100.0% [62] 498(3.3%) 0(0.0%) sample-multi-bounded ...master/src/points.rkt:15:0 for-loop [72] 100.0% ----------------------------------------------------------------------- ??? [50] 100.0% [63] 332(2.2%) 0(0.0%) location-do ...herbie/master/src/programs.rkt:64:0 ??? [50] 100.0% ----------------------------------------------------------------------- for-loop [54] 100.0% [64] 326(2.1%) 326(2.1%) set-precompute! ...ster/src/core/simplify.rkt:79:0 ----------------------------------------------------------------------- ??? [50] 100.0% [65] 280(1.8%) 0(0.0%) mk-ival .../herbie/master/src/biginterval.rkt:57:0 bf [76] 100.0% ----------------------------------------------------------------------- for-loop [56] 100.0% [66] 260(1.7%) 260(1.7%) for-loop ...ie/master/src/core/simplify.rkt:118:23 ----------------------------------------------------------------------- for-loop [85] 23.6% for-loop [58] 76.4% [67] 5186(34.2%) 1290(8.5%) match-e .../herbie/master/src/core/ematch.rkt:39:0 for-loop [77] 55.5% constant? [101] 20.4% ??? [30] 1.6% ----------------------------------------------------------------------- simplify [4] 48.3% hash-ref! [60] 51.7% [68] 688(4.5%) 0(0.0%) parse-loop30 ...s/racket/match/compiler.rkt:418:15 map [79] 51.7% eval-const-expr [83] 48.3% ----------------------------------------------------------------------- for-loop [59] 100.0% [69] 620(4.1%) 0(0.0%) merge-egraph-nodes! ...r/src/core/egraph.rkt:143:0 update-leader! [78] 100.0% ----------------------------------------------------------------------- for-loop [59] 100.0% [70] 592(3.9%) 0(0.0%) dedup-children! ...master/src/core/enode.rkt:195:0 loop [80] 100.0% ----------------------------------------------------------------------- temp68_2 [61] 100.0% [71] 582(3.8%) 0(0.0%) compile16 (unknown source) temp74_0 [81] 100.0% ----------------------------------------------------------------------- sample-multi-bounded [62] 100.0% [72] 498(3.3%) 498(3.3%) for-loop ...lies/herbie/master/src/points.rkt:23:4 ----------------------------------------------------------------------- for-loop [59] 100.0% [73] 334(2.2%) 0(0.0%) substitute-e ...ie/master/src/core/ematch.rkt:64:0 for-loop [82] 100.0% ----------------------------------------------------------------------- hash-ref! [60] 100.0% [74] 332(2.2%) 0(0.0%) ??? ...es/herbie/master/src/core/taylor.rkt:344:33 hash-ref! [60] 100.0% ----------------------------------------------------------------------- hash-ref! [60] 100.0% [75] 332(2.2%) 0(0.0%) ??? ...ies/herbie/master/src/core/taylor.rkt:45:15 hash-ref! [60] 100.0% ----------------------------------------------------------------------- mk-ival [65] 100.0% [76] 280(1.8%) 0(0.0%) bf ...ath-lib/math/private/bigfloat/mpfr.rkt:601:2 new-mpfr [84] 100.0% ----------------------------------------------------------------------- match-e [67] 100.0% [77] 3288(21.7%) 1276(8.4%) for-loop ...erbie/master/src/core/ematch.rkt:52:11 for-loop [85] 61.6% cartesian-product [91] 7.6% foldr [92] 7.6% ----------------------------------------------------------------------- for-loop [55] 31.6% merge-egraph-nodes! [69] 68.4% [78] 906(6.0%) 0(0.0%) update-leader! ...master/src/core/egraph.rkt:211:0 for-loop [86] 100.0% ----------------------------------------------------------------------- for-loop [16] 42.2% parse-loop30 [68] 57.8% [79] 616(4.1%) 0(0.0%) map ...t-7.0/collects/racket/private/map.rkt:35:13 loop [88] 57.8% ??? [90] 42.2% ----------------------------------------------------------------------- dedup-children! [70] 10.5% loop [80] 89.5% [80] 592(3.9%) 592(3.9%) loop ...racket-7.0/collects/racket/list.rkt:434:17 loop [80] 89.5% ----------------------------------------------------------------------- compile16 [71] 100.0% [81] 582(3.8%) 0(0.0%) temp74_0 (unknown source) expand-single [87] 100.0% ----------------------------------------------------------------------- substitute-e [73] 100.0% [82] 334(2.2%) 0(0.0%) for-loop ...erbie/master/src/core/ematch.rkt:73:24 mk-enode! [89] 100.0% ----------------------------------------------------------------------- parse-loop30 [68] 100.0% [83] 332(2.2%) 0(0.0%) eval-const-expr ...e/master/src/programs.rkt:111:0 eval-prog [51] 100.0% ----------------------------------------------------------------------- bf [76] 100.0% [84] 280(1.8%) 280(1.8%) new-mpfr ...b/math/private/bigfloat/mpfr.rkt:335:0 ----------------------------------------------------------------------- for-loop [77] 100.0% [85] 2538(16.7%) 0(0.0%) for-loop ...erbie/master/src/core/ematch.rkt:58:37 match-e [67] 84.4% ??? [95] 15.6% ----------------------------------------------------------------------- update-leader! [78] 100.0% [86] 906(6.0%) 0(0.0%) for-loop ...erbie/master/src/core/egraph.rkt:216:6 for-loop [93] 100.0% ----------------------------------------------------------------------- temp74_0 [81] 100.0% [87] 582(3.8%) 0(0.0%) expand-single (unknown source) expand-capturing-lifts [94] 100.0% ----------------------------------------------------------------------- map [79] 2.7% loop [88] 97.3% [88] 356(2.3%) 0(0.0%) loop ...-7.0/collects/racket/private/map.rkt:40:19 loop [88] 97.3% ??? [96] 2.7% ----------------------------------------------------------------------- for-loop [82] 100.0% [89] 334(2.2%) 0(0.0%) mk-enode! ...erbie/master/src/core/egraph.rkt:97:0 hash-has-key? [97] 100.0% ----------------------------------------------------------------------- map [79] 100.0% [90] 260(1.7%) 0(0.0%) ??? ...ghtlies/herbie/master/src/points.rkt:190:26 ??? [24] 100.0% ----------------------------------------------------------------------- for-loop [77] 100.0% [91] 250(1.6%) 250(1.6%) cartesian-product ...ollects/racket/list.rkt:822:0 ----------------------------------------------------------------------- for-loop [77] 100.0% [92] 250(1.6%) 250(1.6%) foldr ....0/collects/racket/private/list.rkt:242:4 ----------------------------------------------------------------------- for-loop [86] 100.0% [93] 906(6.0%) 0(0.0%) for-loop ...erbie/master/src/core/egraph.rkt:217:8 hash-update! [98] 100.0% ----------------------------------------------------------------------- expand-single [87] 100.0% [94] 582(3.8%) 0(0.0%) expand-capturing-lifts (unknown source) dispatch-transformer41 [108] 57.0% lambda-clause-expander [100] 43.0% ----------------------------------------------------------------------- for-loop [85] 100.0% [95] 536(3.5%) 256(1.7%) ??? ...lies/herbie/master/src/core/ematch.rkt:43:5 for-loop [99] 52.2% ----------------------------------------------------------------------- loop [88] 100.0% [96] 356(2.3%) 356(2.3%) ??? ...-racket/utils/simple-result-arrow.rkt:39:12 ----------------------------------------------------------------------- mk-enode! [89] 100.0% [97] 334(2.2%) 334(2.2%) hash-has-key? ...ket/private/more-scheme.rkt:371:2 ----------------------------------------------------------------------- for-loop [93] 100.0% [98] 906(6.0%) 0(0.0%) hash-update! ...cket/private/more-scheme.rkt:365:4 ??? [102] 100.0% ----------------------------------------------------------------------- ??? [95] 100.0% [99] 280(1.8%) 0(0.0%) for-loop ...herbie/master/src/core/ematch.rkt:44:7 constant? [101] 100.0% ----------------------------------------------------------------------- expand-capturing-lifts [94] 100.0% [100] 250(1.6%) 0(0.0%) lambda-clause-expander (unknown source) finish-bodys [103] 100.0% ----------------------------------------------------------------------- for-loop [99] 17.4% match-e [67] 82.6% [101] 1612(10.6%) 230(1.5%) constant? ...ie/master/src/syntax/syntax.rkt:719:0 value? [104] 85.7% ----------------------------------------------------------------------- hash-update! [98] 100.0% [102] 906(6.0%) 0(0.0%) ??? ...es/herbie/master/src/core/egraph.rkt:219:24 for-loop [105] 100.0% ----------------------------------------------------------------------- lambda-clause-expander [100] 12.5% for-loop [106] 87.5% [103] 250(1.6%) 0(0.0%) finish-bodys (unknown source) for-loop [106] 100.0% ----------------------------------------------------------------------- constant? [101] 100.0% [104] 1382(9.1%) 1382(9.1%) value? .../herbie/master/src/syntax/types.rkt:18:0 ----------------------------------------------------------------------- ??? [102] 100.0% [105] 906(6.0%) 286(1.9%) for-loop ...rbie/master/src/core/egraph.rkt:220:26 update-en-expr [107] 68.4% ----------------------------------------------------------------------- for-loop [106] 11.1% finish-bodys [103] 88.9% [106] 250(1.6%) 0(0.0%) for-loop (unknown source) finish-bodys [103] 77.8% for-loop [106] 11.1% dispatch-transformer41 [108] 11.1% ----------------------------------------------------------------------- for-loop [105] 100.0% [107] 620(4.1%) 620(4.1%) update-en-expr ...master/src/core/egraph.rkt:205:0 ----------------------------------------------------------------------- for-loop [106] 43.0% expand-capturing-lifts [94] 57.0% [108] 582(3.8%) 0(0.0%) dispatch-transformer41 (unknown source) apply-transformer52 [109] 100.0% ----------------------------------------------------------------------- dispatch-transformer41 [108] 100.0% [109] 582(3.8%) 332(2.2%) apply-transformer52 (unknown source) loop [110] 43.0% ----------------------------------------------------------------------- apply-transformer52 [109] 100.0% [110] 250(1.6%) 0(0.0%) loop (unknown source) core-form-sym [111] 100.0% ----------------------------------------------------------------------- loop [110] 100.0% [111] 250(1.6%) 0(0.0%) core-form-sym (unknown source) resolve+shift28 [112] 100.0% ----------------------------------------------------------------------- core-form-sym [111] 100.0% [112] 250(1.6%) 0(0.0%) resolve+shift28 (unknown source) fallback-loop [113] 100.0% ----------------------------------------------------------------------- resolve+shift28 [112] 100.0% [113] 250(1.6%) 250(1.6%) fallback-loop (unknown source) -----------------------------------------------------------------------