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53 Commits

Author SHA1 Message Date
Jakob Stoklund Olesen 3f1bb93cab Add some comments suggested in code review. 
llvm-svn: 159800
 2012-07-06 02:31:22 +00:00
Matt Beaumont-Gay 11d08b2e22 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 f8a63a1507 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