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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104404 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner 2010-05-21 23:16:21 +00:00
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commit c2685a9c98
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lib/Target/README.txt
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@ -1833,6 +1833,21 @@ entry:
We should use DSE + llvm.lifetime.end to delete dead vtable pointer updates.
See GCC PR34949
Another interesting case is that something related could be used for variables
that go const after their ctor has finished. In these cases, globalopt (which
can statically run the constructor) could mark the global const (so it gets put
in the readonly section). A testcase would be:
#include <complex>
using namespace std;
const complex<char> should_be_in_rodata (42,-42);
complex<char> should_be_in_data (42,-42);
complex<char> should_be_in_bss;
Where we currently evaluate the ctors but the globals don't become const because
the optimizer doesn't know they "become const" after the ctor is done. See
GCC PR4131 for more examples.
//===---------------------------------------------------------------------===//
In this code: