tree 2fe7feaacb8812051d76fa1de9c5405e658fb8d8
parent b1c14751beaa2953741c1e203672c6ecc55401ac
author Bob Nystrom <rnystrom@google.com> 1565729688 -0700
committer GitHub <noreply@github.com> 1565729688 -0700
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Optimize _looksLikeClassName() in AOT builds. (#835)

* Optimize _looksLikeClassName() in AOT builds.

The AOT compiler does not currently compile regexes to machine code,
which makes them significantly slower. The regex in this function is
perf critical and makes the dart_style benchmark 65% slower on AOT than
on the JIT.

This fixes some of that regression.

Before:

// JIT
Best   : 4.93ms ========================
Best   : 4.83ms ========================
Best   : 4.80ms ========================

// AOT
Best   : 8.33ms =========================================
Best   : 8.43ms ==========================================
Best   : 8.37ms =========================================

After:

// JIT
Best   : 4.93ms ========================
Best   : 4.83ms ========================
Best   : 4.80ms ========================

// AOT
Best   : 6.93ms ==================================
Best   : 6.87ms ==================================
Best   : 6.77ms =================================

* Don't crash if identifier is "_".