[LLVMbugs] [Bug 716] undef through phi doesn't collapse to undef

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=716

sabre at nondot.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID



------- Additional Comments From sabre at nondot.org  2006-03-09 12:57 -------
That optimization is invalid.  If f is dynamically called with x==0, for example, it is required to return 0.  
'ret undef' wouldn't do that.

The proper optimal result (which we do) is to compile this to 'return 0', which is correct for all defined 
cases.

-Chris



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