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

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Thu Mar 9 10:57:52 PST 2006


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 


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