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else scf yield a memref dealloc 0 may free either a or b resolvereverse 0 traces back to both a and b since b is nested not in the plan block the guard fires a is conservatively skipped nomiscompile no leak the else vs then branch distinction turned out to be irrelevant to theanalysis it works on ssa alias sets not branch structure pr 4 scf for test cases 215221 after the bufferviewflowanalysis switch scf for patterns were handledcorrectly with no additional pass changes this pr documented the results allocs nested inside an scf for body are skipped same rule as nested scf if scf for with iter_args passing buffers across iterations hits the guardin all three mentor patterns the per iteration nested alloc makes erasingany shared dealloc unsafe the canonical valid case entry block allocs used inside the loop body withdeallocs in the entry block transforms cleanly the loop body gets arenaviews instead of raw alloc pointers this pr was deliberately tests only having a clear separation between thiswas a correct transformation that just needed to be documented and thisrequired a new design decision kept the review simple pr 5 edge and error cases 216610 the final pr stress tested the pass with patterns existing tests did not coverand documented the results eight new analysis tests and four new error tests static and dynamic shapes coexisting in one function static transforms dynamic is skipped without interference both branches of an scf if deallocating the same alloc duplicate deallocops in the same arena slot correctly deduplicated dealloc at depth 3 findancestoropinblock walks up any depth not just one level multi hop alias chain a b 0 1 dealloc the resolve bfsfollows the full chain cross interface chain arith select scf if dealloc two differentinterface implementations in one alias path exercised by a single resolve call cf cond_br to a sibling block rejected as unstructured control flow sameerror as cf br walk stops on first error walkresult interrupt points the diagnostic atthe problematic alloc not at subsequent valid ones one test was removed during review a dynamic alloc with no dealloc placed inthe errors file it had no expected error annotation since dynamic shapes aresilently skipped not errored a test without a defined diagnostic output doesnot belong in a verify diagnostics file lesson learned challenges the group constraint dead end the first implementation of arith select support used a fixpoint iteration to enforce that all allocs sharing a deallocmust either all go into the arena or all be skipped this was correct butcomplicated and fragile switching to the reverse alias guard removed thefixpoint entirely the guard is a simpler more direct statement of the sameinvariant understanding what already exists the biggest conceptual shift wasrealizing that bufferviewflowanalysis already did everything the hand rolleddfs was trying to do and more the lesson before implementing a bespoketraversal read the existing analysis infrastructure you will often find thatthe right tool exists and using it both simplifies your code and gives youcorrectness for free on patterns you had not thought about upstream review culture every error message every test comment everyvariable name is scrutinized rephrasing unstructured control flow is notsupported replaced a longer less precise message swapping the order of twobranches in a test to make the alias chain more obvious these details matterbecause the tests and messages are the documentation that future contributorswill read what was built pr what landed 205125 core pass trivial best fit planners alignment arena modes 209106 arith select dealloc chains reverse alias guard o n m lifetime scan 213634 bufferviewflowanalysis integration scf if support nested deallocs result aliases 215221 scf for test coverage canonical loop case documented 216610 edge and error case test suite 26 analysis tests 4 error tests the final pass lives in staticmemoryplanneranalysis cpp future work the immediate open question is lifting the entry block restriction only allocsin the function s entry block are planned today two concrete directions wediscussed path sensitive lifetime tightening the current timestart timeend interval model treats branches conservatively a buffer freed inside an scf if then branch is considered live until the entire scf if completes even though the else path never held it adding dominance based non overlapdetection using mlir s existing dominanceinfo would let mutually exclusivebranches share arena slots unlocking patterns like 0 alloc 1 scf if c 2 alloc could share 0 s slot they never co exist dealloc 0 yield 2 else yield 0 dealloc 1 plugging in stronger planning algorithms the planner function is pure andseparately testable so dropping in a better algorithm is straightforward best fit is already there beyond that interval graph graph coloringapproaches and algorithms like minimalloc map directly onto the size alignment timestart timeend interface the planner already expects memory space awareness heterogeneous targets have multiple distinct memoryregions with different capacity constraints extending the planner to assignbuffers to specific memory spaces while respecting per space limits is a naturalfollow on acknowledgements huge thanks to my mentors matthias springer and javed absar for the patient andprecise review feedback for pointing at bufferviewflowanalysis at exactlythe right moment and for treating every pr as a teaching opportunity the llvmcommunity s review culture is demanding in the best possible way the project gsoc page is at summerofcode withgoogle com programs 2026 projects xsjxbq9o feel free to reach out with questions or to build on this work at krishgupta2832 gmail com the llvm project blog no image reworking the prime path cache i just reworked how the caching of prime paths works in zcov computing the prime paths can be quite expensive in both time and memory so gcc limits to 250 000 paths by default this limit was chosen because at around 250k the later passes slow down significantly verifying the newly emitted instructions seem to be the worst offender but i don t have hard data here but there are functions out there where just finding the prime paths is infeasible on my workstation the prime paths are given by the structure of the function specifically the control flow graph which makes it a prime candidate for caching this is especially useful for zcov as it is an interactive application where every microsecond matters even more so since code tends to change very little between coverage runs and most of those changes are in the test suite and not the code being tested and so the same functions will be analyzed again and again since the same project will be tested over a long time with reasonably few and slow changes we have an perfect use case for a persistent cache the caching feature was implemented a long time ago and was quite quickly put together it was for all intents and purposes the just computed suffix tree dumped to disk for non trivial functions this was an obvious improvement but still had a large space and time overhead it meant storing all subpaths too i tried a few different things and put together a new bespoke representation for a set of prime paths optimized to reduce memory usage which i then benchmarked on 485 functions from gnu coreutils in the benchmark i measured the time in microseconds it too to compute the prime paths look up the prime paths in the old cache look up the prime paths in the new cache here are some aggregate statistics from a pandas dataframe mean median min max path count 181698 15 1 84197299 compute µs 4636 26 6 00 1 00 1572546 00 new cache hit µs 44 79 7 00 4 00 13678 00 old cache hit µs 1716 59 10 00 5 00 525424 00 compute µs path 0 53 0 45 0 01 1 73 new cache µs path 0 60 0 44 0 00 3 50 old cache µs path 0 86 0 64 0 00 3 00 what the median and min max path count tells us is that most functions are small and simple but once they go beyond that the path count explodes that we apparently have higher throughput lower elapsed per path time suggest that for very simple functions the cost of looking up the cache is higher than just computing the number of paths this is confirmed by filtering out any function with less than 30 paths mean median min max path count 530842 124 31 84197299 compute µs 13536 43 101 00 3 00 1572546 00 new cache hit µs 118 52 9 00 4 00 13678 00 old cache hit µs 4998 68 39 00 10 00 525424 00 compute µs path 0 77 0 74 0 01 1 73 new cache µs path 0 08 0 06 0 00 0 35 old cache µs path 0 33 0 33 0 00 0 58 new cache compute 0 18 0 06 0 00 2 67 compute new cache 39 58 17 19 0 38 254 53 old cache compute 0 63 0 41 0 12 10 25 new cache old cache 0 22 0 16 0 01 0 73 old cache new cache 15 91 6 14 1 36 115 83 so on average the new cache takes 0 08µs path while computing takes 0 77µs path a 10x on average as opposed to the approx 2x of the old cache this is in practice skewed by the cost of the cache being high for very small functions sub 50 paths tend to take less than 5 µs to compute if we look at the fastest slowest functions while still filtering out those with less than 30 paths function path count compute µs new cache hit µs old cache hit µs compute µs path new cache µs path three_arguments 31 13 7 15 0 42 0 23 main 31 5 11 15 0 16 0 35 value_to_baud 32 32 8 14 1 00 0 25 apply_mode 32 13 8 14 0 41 0 25 write_to_file 32 21 8 13 0 66 0 25 string_to_baud 61 46 8 21 0 75 0 13 sane_mode 62 58 8 17 0 94 0 13 set_suffix_length 64 97 8 32 1 52 0 12 parse_symbols 64 55 7 20 0 86 0 11 set_file_security_ctx 65 45 7 23 0 69 0 11 main 63790 24282 144 15101 0 38 0 00 lines_rr 74899 22539 100 4256 0 30 0 00 ng_pollard_rho2 1416562 101036 627 39961 0 07 0 00 ine_bytes_split 1425449 147657 633 27143 0 10 0 00 parents_private 84197299 1572546 13678 525424 0 02 0 00 from this table we can see that even for very complex functions the cache hits are fast we fetch 84 million paths in about 13 5ms which is decently quick and should be fine for comparison computing the same function takes about 1 6s and finally the relative improvement function path count compute new cache old cache new cache three_arguments 31 1 86 2 14 main 31 0 45 1 36 value_to_baud 32 4 00 1 75 apply_mode 32 1 62 1 75 write_to_file 32 2 62 1 62 string_to_baud 61 5 75 2 62 sane_mode 62 7 25 2 12 set_suffix_length 64 12 12 4 00 parse_symbols 64 7 86 2 86 set_file_security_ctx 65 6 43 3 29 main 63790 168 62 104 87 lines_rr 74899 225 39 42 56 ng_pollard_rho2 1416562 161 14 63 73 ine_bytes_split 1425449 233 27 42 88 parents_private 84197299 114 97 38 41 as the number of path goes past 40 50 into moderately complex functions we are looking at from 5 10 speed improvement over computing and 2 4x speed improvement over the old cache for complex functions more than 50 000 paths the new cache is more than 100x faster than computing and more than 40 times faster than the old cache one of the ways this has been made quick is by significantly compressing the representation which also reduces memory pressure the old cache needs roughly 460 mb to store all the prime paths while the new cache needs 93 mb to store the same set about 20 speed matters this translates into making the experience using zcov much nicer and smoother patch blog sunday october 18 2026 yhirose cpp httplib v0 62 0 a c header only http https server and client library yhirose cpp httplib composite objects and c 26 the std polymorphic type in a previous article i discussed the c std indirect type and how it helps implementing the pimpl idiom however the std indirect type was inducted in the standard alongside another type called std polymorphic this helps implementing composite classes where composite means a class composed of member objects in an has a relation where the composite own the read more the post composite objects and c 26 the std polymorphic type first appeared on marius bancila s blog marius bancila s blog strikerx3 ymir v0 4 1 sega saturn emulator strikerx3 ymir getml reflect cpp v0 26 0 a c 20 library for fast serialization deserialization and validation using reflection supports json avro bson cap n proto cbor csv flexbuffers msgpack parquet toml ubjson xml yaml msgpack org c 20 getml reflect cpp nekernel org src v1 0 1051 the ne system is a collection of system modules written in modern c nekernel org src the problem with c safety part 1 why it works isn t good enough rainer grimm s blog continues in this first article of a new series klaus iglberger looks at why c is called memory unsafe and argues that the real problem isn t the language itself but how we write and teach it mc blog co designing integrated ai enabled compiler runtime systems hartmut kaiser c now 2026 cppnow random numbers in c are a lie deepdivedev saturday october 17 2026 strikerx3 ymir v0 4 0 sega saturn emulator strikerx3 ymir interview with andreas pfaffenbichler external polymorphism in c 23 meetingcpp the not so hidden corners of c abi stability luis caro campos accu 2026 accuconf ogrecave ogre v14 6 1 high performance rendering backend c python c java ogrecave ogre odygrd quill v13 1 0 asynchronous low latency c logging library odygrd quill array vs linked list why cache makes the difference c deepdivedev decoding base64 in python at 10 gigabytes per second we sometimes need to convert binary data to text for example your emails must be stored as text files naïvely you could just use a string of 0 and 1 but it would mean using one character per bit we can do better by using 64 ascii characters all letters all numbers plus a few continue reading decoding base64 in python at 10 gigabytes per second daniel lemire s blog _paradise lost_ diffed one of my book clubs will be starting milton s _paradise lost_ soon preparing for that reading i learned that there are actually two different versions of _paradise lost_ the original 1667 edition in ten books and the 1674 revised edition in twelve are the differences between the two editions as significant as say the differences between the 1818 and 1831 editions of mary shelley s _frankenstein_ to find out i wanted a website similar to eduardo villuendas _frankendiff com_ https frankendiff com so i made one presenting paradise lost diffed https quuxplusone github io wikisource milton paradise lost diffed html arthur o dwyer friday october 16 2026 yhirose cpp peglib v1 22 0 a single file c header only peg parsing expression grammars library yhirose cpp peglib c futures part 5 std future and std shared_future getting the results back out the post c futures part 5 std future and std shared_future appeared first on the old new thing the old new thing the nim programming language part 2 northwest c users group the secret to c reflection now cmake code generation bret brown c now 2026 cppnow xmake io xmake v3 1 2 a cross platform build utility based on lua xmake io xmake ️ episode 308 rule of n with jason turner ️ adsp midi 2 0 ready to ship brett g porter adc j...