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3 Commits

Author SHA1 Message Date
Duncan Sands 6dcd49bc2b Simplify RecursivelyDeleteDeadPHINode. The only functionality change 
should be that if the phi is used by a side-effect free instruction with
no uses then the phi and the instruction now get zapped (checked by the
unittest).

llvm-svn: 126124
 2011-02-21 16:27:36 +00:00
Nick Lewycky 183c24c51b Make RecursivelyDeleteDeadPHINode delete a phi node that has no users and add a 
test for that. With this change, test/CodeGen/X86/codegen-dce.ll no longer finds
any instructions to DCE, so delete the test.

Also renamed J and JP to I and IP in RecursivelyDeleteDeadPHINode.

llvm-svn: 126088
 2011-02-20 18:05:56 +00:00
Nick Lewycky c8a1569950 Teach RecursivelyDeleteDeadPHINodes to handle multiple self-references. Patch 
by Andrew Clinton!

llvm-svn: 126077
 2011-02-20 08:38:20 +00:00