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These IRgen improvements have been done.

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Technically we could still do a bit more to avoid deferred generation of statics
which we know are used, but I seriously doubt this is important.

llvm-svn: 76844
This commit is contained in:
Daniel Dunbar 2009-07-23 03:03:07 +00:00
parent b1b77ca862
commit a244814e6f
1 changed files with 0 additions and 18 deletions
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18
clang/lib/CodeGen/README.txt
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@ -45,21 +45,3 @@ On 176.gcc:expr.ll, it looks like over 12% of basic blocks are just
direct branches!
//===---------------------------------------------------------------------===//
There are some more places where we could avoid generating unreachable code. For
example:
void f0(int a) { abort(); if (a) printf("hi"); }
still generates a call to printf. This doesn't occur much in real
code, but would still be nice to clean up.
//===---------------------------------------------------------------------===//
Deferred generation of statics incurs some additional
overhead. Currently it is even possible to construct test cases with
O(N^2) behavior! For at least simple cases where we can tell a global
is used, it is probably not worth deferring it. This doesn't solve the
O(N^2) cases, ,though...
PR3810
//===---------------------------------------------------------------------===//