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Author SHA1 Message Date
Davide Italiano d15477b09d Revert "[GVN/PRE] Hoist global values outside of loops." 
There's no agreement about this patch. I personally find the
PRE machinery of the current GVN hard enough to reason about
that I'm not sure I'll try to land this again, instead of working
on the rewrite).

llvm-svn: 284796
 2016-10-21 01:37:02 +00:00
Davide Italiano 590ad7037e [GVN/PRE] Hoist global values outside of loops. 
In theory this could be generalized to move anything where
we prove the operands are available, but that would require
rewriting PRE. As NewGVN will hopefully come soon, and we're
trying to rewrite PRE in terms of NewGVN+MemorySSA, it's probably
not worth spending too much time on it. Fix provided by
Daniel Berlin!

llvm-svn: 284311
 2016-10-15 21:35:23 +00:00
Davide Italiano 4edd54794b [GVN] Move other PRE tests to a subdirectory. 
llvm-svn: 275742
 2016-07-17 23:55:20 +00:00