cargo-llvm-lines

Count the number of lines of LLVM IR across all instantiations of a generic function. Based on a suggestion from @eddyb on how to count monomorphized functions in order to debug compiler memory usage, executable size and compile time.

\ unoptimized LLVM IR
\ first used grep '^define' to get only the lines defining function bodies
\ then regex replace in my editor to remove everything before @ and everything after (
\ then sort | uniq -c

Installation

Install with cargo install cargo-llvm-lines.

Output

One line per function with three columns of output:

Total number of lines of LLVM IR generated across all instantiations of the function.
Number of instantiations of the function. For a generic function, roughly the number of distinct combinations of generic type parameters it is called with.
Name of the function.

``` $ cargo llvm-lines | head -20

2447 130 core::ptr::dropinplace 1720 19 >::map 862 2 core::str::pattern::TwoWaySearcher::next 726 4 >::double 698 4 >::reserve 677 6 >::map 602 1 cargollvmlines::readllvmir 598 5 >::extenddesugared 477 1 cargollvmlines::countlines 476 9 >::deallocbuffer 464 10 alloc::heap::boxfree 452 5 as alloc::vec::SpecExtend>::specextend 448 1 alloc::slice::mergesort 436 1 ::pipeto 419 4 as core::iter::iterator::Iterator>::next 400 1 ::drounds 378 9 >::currentlayout 362 3 >::allocatein 354 4 >::push 341 4 <[T] as core::slice::SliceExt>::iter ```

License

^{Licensed under either of Apache License, Version
2.0 or MIT license at your option.}

_{Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in this crate by you, as defined in the Apache-2.0 license, shall
be dual licensed as above, without any additional terms or conditions.}