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Author SHA1 Message Date
Kyle Butt 267164df0a Codegen: Fix broken assumption in Tail Merge. 
Tail merge was making the assumption that a layout successor or
predecessor was always a cfg successor/predecessor. Remove that
assumption. Changes to tests are necessary because the errant cfg edges
were preventing optimizations.

llvm-svn: 273700
 2016-06-24 18:16:36 +00:00
Jakob Stoklund Olesen 1995b9fead Handle bundled terminators in isBlockOnlyReachableByFallthrough. 
Targets like SPARC and MIPS have delay slots and normally bundle the
delay slot instruction with the corresponding terminator.

Teach isBlockOnlyReachableByFallthrough to find any MBB operands on
bundled terminators so SPARC doesn't need to specialize this function.

llvm-svn: 199061
 2014-01-12 19:24:08 +00:00