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19:25:38  <mikolalysenko_>anyone have any great protips on trouble shooting v8's deoptimizations?
19:29:01  <caitp>--trace-deopt and --trap-on-deopt should be helpful for debugging
19:31:44  <mikolalysenko_>hmm
19:32:06  <mikolalysenko_>trace-deopt tells me that it is deoptimizing, but I can't figure out why it is deoptimizing
19:32:24  <mikolalysenko_>just get the opaque "bailout at XXX", but reason for bailout isn't clear
19:35:57  <mikolalysenko_>will look into trap-on-deopt. is there a good way to use that in node/chrome without having to recompile v8 from source?
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19:42:21  <caitp>well I expect it will do the most for you if you use a debugger along with it
19:42:40  <caitp>buuuut
19:42:52  <caitp>deopt reasons are present in code, so they must be emitted somewhere
19:42:58  <caitp>I am not sure where though :>
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20:05:03  <mikolalysenko_>caitp: managed to have some luck with ir hydra
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21:02:24  <caitp>i have no idea how to construct an array with the macro assembler
21:02:30  <caitp>why is it so dang hard :(
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21:50:50  <bnoordhuis>caitp: can't you call one of the array constructor stubs?
21:51:50  <bnoordhuis>or just call one of the runtime functions
22:17:25  <caitp>i'm trying to construct the rest params with a fast path without calling the fallback runtime construction, if there's enough space in the heap
22:18:16  <caitp>but I'm not sure how to set up the array maps correctly since you seem to only be able to get array maps dynamically
22:18:27  <caitp>and not quite sure how to tag the object correctly
22:18:36  <caitp>but, gonna worry about that later, christmas eve :>
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