2 Commits

Author	SHA1	Message	Date
Matt Beaumont-Gay	723207e88f	Fix some ascii art in a comment to not have trailing backslashes (inspiration ... from IfConversion.cc), and fix some spelling and grammar in the surrounding prose. llvm-svn: 159699	2012-07-04 01:09:45 +00:00
Jakob Stoklund Olesen	db187a51eb	Add an experimental early if-conversion pass, off by default. ... This pass performs if-conversion on SSA form machine code by speculatively executing both sides of the branch and using a cmov instruction to select the result. This can help lower the number of branch mispredictions on architectures like x86 that don't have predicable instructions. The current implementation is very aggressive, and causes regressions on mosts tests. It needs good heuristics that have yet to be implemented. llvm-svn: 159694	2012-07-04 00:09:54 +00:00