Chris Lattner b2de9bbb5e do not bother reuniquing mdnodes whose operands drop to null. Doing ...

so can be a huge performance issue when tearing down modules and mdnodes
are not guaranteed to be unique anyway.  This speeds up:
$ time ~/llvm/Release/bin/clang gcc.c -w -S -g

from 72 to 35s, where gcc.c is from:
http://people.csail.mit.edu/smcc/projects/single-file-programs/

llvm-svn: 92315

2009-12-30 21:42:11 +00:00

..

llvm

do not bother reuniquing mdnodes whose operands drop to null. Doing

2009-12-30 21:42:11 +00:00

llvm-c

improve compatibility with SWIG, patch by James Knight!

2009-12-21 07:52:40 +00:00