Steps I take when optimizing the Rust compiler

栏目: IT技术 · 发布时间: 5年前

内容简介:This commit makes the following writing improvements:And the following reading improvements:And the following improvements for both reading and writing:

This commit makes the following writing improvements:

write_to_vec

And the following reading improvements:

  • Removes an unnecessary type annotation.
  • Fixes a dangerous unchecked slice access. Imagine a slice [0x80] --
    the current code will read past the end of the slice some number of
    bytes. The bounds check at the end will subsequently trigger, unless
    something bad (like a crash) happens first. The cost of doing bounds
    check in the loop body is negligible.
  • Avoids a mask on the final byte.

And the following improvements for both reading and writing:

  • Changes for to loop for the loops, avoiding an unnecessary

    condition on each iteration. This also removes the need for

    leb128_size .

All of these changes give significant perf wins, up to 5%.

r? @michaelwoerister


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