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YJIT: Delete otherwise-empty defer_compilation() blocks

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Calls to defer_compilation() leave behind a stub and a `struct Block`
that we retain. If the block is empty, it only exits to hold the
`struct Branch` that the stub needs.

This patch transplants the branch out of the empty block into the newly
generated block when the defer_compilation() stub is hit, and deletes
the empty block to save memory.

To assist the transplantation, `Block::outgoing` is now a
`MutableBranchList`, and `Branch::Block` now in a `Cell`. These types
don't incur a size cost.

On the `lobsters` benchmark, `yjit_alloc_size` is roughly 98% of what
it was before the change.

Co-authored-by: Kevin Menard <kevin.menard@shopify.com>
Co-authored-by: Randy Stauner <randy@r4s6.net>
Co-authored-by: Maxime Chevalier-Boisvert <maxime.chevalierboisvert@shopify.com>
This commit is contained in:
Alan Wu 2024-06-11 16:34:08 -04:00
parent 28d1685ebb
commit ffd895156f
3 changed files with 102 additions and 28 deletions
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yjit.rb
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@ -366,6 +366,7 @@ module RubyVM::YJIT
out.puts "compiled_iseq_count: " + format_number(13, stats[:compiled_iseq_count])
out.puts "compiled_blockid_count:" + format_number(13, stats[:compiled_blockid_count])
out.puts "compiled_block_count: " + format_number(13, stats[:compiled_block_count])
out.puts "deleted_defer_block_count:" + format_number_pct(10, stats[:deleted_defer_block_count], stats[:compiled_block_count])
if stats[:compiled_blockid_count] != 0
out.puts "versions_per_block: " + format_number(13, "%4.3f" % (stats[:compiled_block_count].fdiv(stats[:compiled_blockid_count])))
end