Eli Friedman 1478b657c8 Enhanced vzeroupper insertion pass that avoids inserting vzeroupper where it is unnecessary through local analysis. Patch from Bruno Cardoso Lopes, with some additional changes.
I'm going to wait for any review comments and perform some additional testing before turning this on by default.

llvm-svn: 143750
2011-11-04 23:46:11 +00:00
..
2011-11-04 20:20:34 +00:00
2011-08-31 21:44:24 +00:00
2011-10-24 17:24:05 +00:00