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Speed up the parser #692

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Merged
merged 1 commit into from
Nov 24, 2025
Merged

Speed up the parser #692

merged 1 commit into from
Nov 24, 2025

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@robertoraggi
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@robertoraggi robertoraggi commented Nov 24, 2025

Prefer std::vector to std::unordered_set in the name
lookup caches and cxx::Identifier to std::string_view
for the preprocessor hidesets.

$ time build/src/frontend/cxx.new tests/manual/source.cc
build/src/frontend/cxx.new tests/manual/source.cc  0.39s user 0.15s system 60% cpu 0.886 total

$ time build/src/frontend/cxx.orig tests/manual/source.cc
build/src/frontend/cxx.orig tests/manual/source.cc  0.54s user 0.14s system 99% cpu 0.679 total

and

$ time build/src/frontend/cxx.new -I /opt/homebrew/include /opt/homebrew/include/boost/graph/adjacency_list.hpp
build/src/frontend/cxx.new -I /opt/homebrew/include   0.62s user 0.20s system 99% cpu 0.821 total

$ time build/src/frontend/cxx.orig -I /opt/homebrew/include /opt/homebrew/include/boost/graph/adjacency_list.hpp 
build/src/frontend/cxx.orig -I /opt/homebrew/include   1.39s user 0.21s system 99% cpu 1.610 total

@robertoraggi
Speed up the parser
47550f7 
Prefer std::vector to std::unordered_set in the name
lookup caches and cxx::Identifier to std::string_view
for the preprocessor hidesets.
@robertoraggi robertoraggi merged commit b331648 into main Nov 24, 2025
8 checks passed
@robertoraggi robertoraggi deleted the careful-marten branch November 24, 2025 17:50
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@robertoraggi