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Author SHA1 Message Date
Jakob Stoklund Olesen 83a927d84a Handle extra Tail predecessors in if-conversion. 
It is still possible to if-convert if the tail block has extra
predecessors, but the tail phis must be rewritten instead of being
removed.

llvm-svn: 161781
 2012-08-13 20:49:04 +00:00
Jakob Stoklund Olesen 49e4d4b3ef Add early if-conversion support to X86. 
Implement the TII hooks needed by EarlyIfConversion to create cmov
instructions and estimate their latency.

Early if-conversion is still not enabled by default.

llvm-svn: 159695
 2012-07-04 00:09:58 +00:00