53 Commits

Author	SHA1	Message	Date
Chris Lattner	b5ada398a2	Fix #includes of i*.h => Instructions.h as per PR403: ... http://llvm.cs.uiuc.edu/PR403 . llvm-svn: 15333	2004-07-29 17:23:00 +00:00
Chris Lattner	520df8464b	Fix a bug in the unreachable block elim pass. Dropping all references on a ... basic block clear()'s all of the operands lists, including phis. This caused removePredecessor to get confused later. Because of this, we just nuke (without prejudice) PHI nodes in unreachable blocks. llvm-svn: 14635	2004-07-06 06:36:11 +00:00
Chris Lattner	693244fb33	Add a trivially simple pass to delete unreachable blocks from the CFG. This ... pass is required to paper over problems in the code generator (primarily live variables and its clients) which doesn't really have any well defined semantics for unreachable code. The proper solution to this problem is to have instruction selectors not select blocks that are unreachable. Until we have a instruction selection framework available for use, however, we can't expect all instruction selector writers to do this. Until then, this pass should be used. llvm-svn: 14563	2004-07-02 05:46:10 +00:00