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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45914 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner 2008-01-12 18:58:46 +00:00
parent f4a5498ab4
commit 65844fbd84
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10
lib/Target/README.txt
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@ -610,6 +610,14 @@ pointer parameters for alias analysis. Some ideas:
arguments when the function is inlined.
These functions can be inferred by various analysis passes such as the
globalsmodrefaa pass.
globalsmodrefaa pass. Note that getting #2 right is actually really tricky.
Consider this code:
struct S; S G;
void caller(S byvalarg) { G.field = 1; ... }
void callee() { caller(G); }
The fact that the caller does not modify byval arg is not enough, we need
to know that it doesn't modify G either. This is very tricky.
//===---------------------------------------------------------------------===//