compact compiler ids and spans to reduce memory usage

2026-06-12 16:55:16 +02:00
parent 99ba907f59
commit 4112b79c6b
16 changed files with 972 additions and 573 deletions
@@ -29,3 +29,9 @@ The measured run reduced token size by 14.3% and peak tracked memory by 9.8%.
 After the iterative compiler-hardening work on 2026-06-12, the same benchmark
 reported 13,222,443 peak bytes and 40,117 allocations. The reusable traversal
 stacks keep allocation count effectively unchanged from the interning baseline.
+
+After migrating persistent compiler references and spans to compact IDs on
+2026-06-12, the benchmark reported 8,651,659 peak bytes and 40,117 allocations.
+`Span` is 12 bytes and `Token` is 24 bytes; AST expressions, HIR expressions,
+and IR instructions are 64, 88, and 88 bytes respectively. These sizes are
+also printed by the benchmark to catch layout regressions.