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[WebAssembly] Add another optimization idea to README.txt. 

llvm-svn: 261354
This commit is contained in:
Dan Gohman 2016-02-19 19:22:44 +00:00
parent 41331afaef
commit 87e368b7db
1 changed files with 6 additions and 0 deletions
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6
llvm/lib/Target/WebAssembly/README.txt
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@ -100,3 +100,9 @@ WebAssembly registers are implicitly initialized to zero. Explicit zeroing is
therefore often redundant and could be optimized away. therefore often redundant and could be optimized away.
//===---------------------------------------------------------------------===// //===---------------------------------------------------------------------===//
Small indices may use smaller encodings than large indices.
WebAssemblyRegRenumbering should sort registers according to their usage
frequency to maximize the usage of smaller encodings.
//===---------------------------------------------------------------------===//