Lazy VariableIndexer in ast_to_binary.dart

Often a VariableIndexer was initialized with no use.
This CL eliminates that by creating it as needed.

Golem says:

ia32

whole stack (i.e. together with the utf8 stuff)

AstToBinary (Intel Xeon)	4.265% (0.3 noise)
AstToBinaryP50 (Intel Xeon)	4.364% (0.3 noise)
AstToBinaryP90 (Intel Xeon)	4.365% (0.3 noise)
AstToBinaryP90 (Intel Core i5)	5.890% (0.3 noise)
AstToBinary (Intel Core i5)	5.772% (0.3 noise)
AstToBinaryP50 (Intel Core i5)	6.004% (0.4 noise)

by itself (i.e. compared to the one with hte utf8 stuff)

AstToBinary (Intel Xeon)	0.4910% (0.0 noise)
AstToBinaryP50 (Intel Xeon)	0.6186% (0.0 noise)
AstToBinaryP90 (Intel Xeon)	0.6415% (0.0 noise)
AstToBinaryP90 (Intel Core i5)	1.974% (0.1 noise)
AstToBinary (Intel Core i5)	1.854% (0.1 noise)
AstToBinaryP50 (Intel Core i5)	2.072% (0.1 noise)


whole stack (i.e. together with the utf8 stuff)

whole stack

AstToBinaryP90 (Intel Core i5)	5.457% (0.2 noise)
AstToBinaryP50 (Intel Xeon)	5.150% (0.4 noise)
AstToBinary (Intel Xeon)	5.552% (0.4 noise)
AstToBinaryP90 (Intel Xeon)	5.756% (0.4 noise)
AstToBinaryP50 (Intel Core i5)	4.809% (0.4 noise)
AstToBinary (Intel Core i5)	5.099% (0.5 noise)

by itself (i.e. compared to the one with hte utf8 stuff)

AstToBinaryP50 (Intel Core i5)	-0.6758% (-0.1 noise)
AstToBinary (Intel Core i5)	-0.0593% (-0.0 noise)
AstToBinaryP90 (Intel Core i5)	1.292% (0.0 noise)
AstToBinaryP50 (Intel Xeon)	0.6355% (0.0 noise)
AstToBinaryP90 (Intel Xeon)	0.9089% (0.1 noise)
AstToBinary (Intel Xeon)	0.9836% (0.1 noise)

Change-Id: Ia9a86958f9a9280c6ee40695fe3020debb8312a5
Reviewed-on: https://dart-review.googlesource.com/c/85340
Commit-Queue: Jens Johansen <jensj@google.com>
Reviewed-by: Peter von der Ahé <ahe@google.com>
1 file changed
tree: daac470a7a4a6fe85d239571959a2355963e3e32
  1. .github/
  2. build/
  3. client/
  4. docs/
  5. pkg/
  6. runtime/
  7. samples/
  8. samples-dev/
  9. sdk/
  10. tests/
  11. third_party/
  12. tools/
  13. utils/
  14. .clang-format
  15. .gitattributes
  16. .gitconfig
  17. .gitignore
  18. .gn
  19. .mailmap
  20. .packages
  21. .vpython
  22. AUTHORS
  23. BUILD.gn
  24. CHANGELOG.md
  25. codereview.settings
  26. CONTRIBUTING.md
  27. dartdoc_options.yaml
  28. DEPS
  29. LICENSE
  30. PATENTS
  31. PRESUBMIT.py
  32. README.dart-sdk
  33. README.md
  34. WATCHLISTS
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