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Updated Note Rust performance fixes (markdown)

pcwalton
2012-08-27 16:48:40 -07:00
parent 69bd637f81
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Note-Rust-performance-fixes.md
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@@ -39,6 +39,12 @@ pcwalton:
pcwalton:
also ty::sty comparison in the ty hashtable is calling into the shape glue. I'm going to try to fix that this week
pcwalton:
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
## 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.