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add some notes.

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llvm-svn: 45854
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Chris Lattner 2008-01-11 06:17:47 +00:00
parent bf51fecdc4
commit 08a33a998a
1 changed files with 18 additions and 0 deletions
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18
lib/Target/README.txt
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@ -595,3 +595,21 @@ to make it so the scheduler doesn't need to hold all the loads in regs at
once.
//===---------------------------------------------------------------------===//
We should extend parameter attributes to capture more information about
pointer parameters for alias analysis. Some ideas:
1. Add a "nocapture" attribute, which indicates that the callee does not store
the address of the parameter into a global or any other memory location
visible to the callee. This can be used to make basicaa and other analyses
more powerful. It is true for things like memcpy, strcat, and many other
things, including structs passed by value, most C++ references, etc.
2. Generalize readonly to be set on parameters. This is important mod/ref
info for the function, which is important for basicaa and others. It can
also be used by the inliner to avoid inserting a memcpy for byval
arguments when the function is inlined.
These functions can be inferred by various analysis passes such as the
globalsmodrefaa pass.
//===---------------------------------------------------------------------===//