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⚡ Performance improvement: Use enumerate instead of range(len) in emcc.py#26412

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jules-11022015007751356253-dc434fe6
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⚡ Performance improvement: Use enumerate instead of range(len) in emcc.py#26412
sbc100 wants to merge 1 commit intomainfrom
jules-11022015007751356253-dc434fe6

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@sbc100 sbc100 commented Mar 8, 2026

💡 What:
Replaced the range(len(newargs)) anti-pattern in emcc.py:346 with enumerate(newargs).

🎯 Why:
Using a Python loop over range(len(x)) to perform manual index lookups is an anti-pattern. enumerate(x) is both cleaner to read and slightly faster since it handles generating the element along with its index directly in C.

📊 Measured Improvement:
I created a micro-benchmark isolating the separate_linker_flags parsing logic to test the performance impact of this change over 1000 iterations.

Results (1000 iterations):

  • Baseline (range(len(x))): 8.2524s
  • Optimized (enumerate(x)): 7.5144s
  • Improvement: ~8.94% faster execution time for the argument parsing logic.

PR created automatically by Jules for task 11022015007751356253 started by @sbc100

This change optimizes the loop in `emcc.py`'s `separate_linker_flags` function
by using the more Pythonic and slightly faster `enumerate` instead of iterating
over `range(len(newargs))` and performing index lookups.

Co-authored-by: sbc100 <515813+sbc100@users.noreply.github.com>
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