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BLI: avoid compiling same function multiple times for trivial types #119601

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Jacques Lucke merged 4 commits from JacquesLucke/blender:reduce-cpp-types-code-gen into main 2024-03-19 13:45:14 +01:00
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Jacques Lucke commented 2024-03-17 21:26:21 +01:00
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For example, copying and moving a trivial type ends is the same. However, currently we generate the code for both cases independently instead of reusing the same underlying function.

This reduces the size of the Blender binary from 218.548.896 to 218.355.552 bytes for me. So it's a reduction of about 200kb.

It's probably possible to reduce this even more, but that's for another day. The main tricky thing here is telling the compiler that a const from a function parameter can be cast away for trivial types (see code comment). Maybe there is a better way to do this while making sure the compiler doesn't generate unnecessary code.

For example, copying and moving a trivial type ends is the same. However, currently we generate the code for both cases independently instead of reusing the same underlying function. This reduces the size of the Blender binary from `218.548.896` to `218.355.552` bytes for me. So it's a reduction of about 200kb. It's probably possible to reduce this even more, but that's for another day. The main tricky thing here is telling the compiler that a `const` from a function parameter can be cast away for trivial types (see code comment). Maybe there is a better way to do this while making sure the compiler doesn't generate unnecessary code.
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Jacques Lucke added 1 commit 2024-03-17 21:26:27 +01:00
Jacques Lucke added 1 commit 2024-03-17 21:28:28 +01:00
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Jacques Lucke requested review from Hans Goudey 2024-03-17 21:33:47 +01:00
Jacques Lucke commented 2024-03-17 21:33:55 +01:00
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@blender-bot build

@blender-bot build
Hans Goudey approved these changes 2024-03-18 20:14:55 +01:00
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Nice change! I can confirm the binary size reduction. And if anything there would be a performance improvement too, from better cache use!

Nice change! I can confirm the binary size reduction. And if anything there would be a performance improvement too, from better cache use!
source/blender/blenlib/BLI_cpp_type_make.hh Outdated
@ -252,2 +259,2 @@
move_assign_ = move_assign_cb<T>;
move_assign_indices_ = move_assign_indices_cb<T>;
if constexpr (std::is_trivially_move_assignable_v<T>) {
/* This casts away the const from the src pointer. This should be fine for trivial types as
Hans Goudey commented 2024-03-18 20:12:50 +01:00
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How about should be -> is so reading the code doesn't leave me with a sense of doubt? :)

How about `should be` -> `is` so reading the code doesn't leave me with a sense of doubt? :)
JacquesLucke marked this conversation as resolved
Jacques Lucke added 2 commits 2024-03-19 13:43:51 +01:00
Jacques Lucke merged commit dc762d0914 into main 2024-03-19 13:45:14 +01:00
Jacques Lucke deleted branch reduce-cpp-types-code-gen 2024-03-19 13:45:17 +01:00
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