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Updated Note Rust performance fixes (markdown)

pcwalton
2012-08-27 16:54:37 -07:00
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Note-Rust-performance-fixes.md
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@@ -45,6 +45,14 @@ oh yeah, another thing I was thinking: stop making so many basic blocks
pcwalton:
especially when optimization is off, LLVM goes basic-block-by-basic-block in codegen
pcwalton: oh yeah, we should also see if we can get away with not zeroing out memory when we allocate it
pcwalton:
that's like 5% of our performance right there
pcwalton:
in some profiles anyway
## Memory moves
If you see large sequences of "mov" instructions, use `call_memmove` or `memzero` in trans, as appropriate. This is usually a symptom of code like `Store(bcx, Load(bcx, foo, bar), baz);`, which is *not* an efficient way to move large structural types around.