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Author SHA1 Message Date
Kyle Butt 07d61425e3 Codegen: Don't tail-duplicate blocks with un-analyzable fallthrough. 
If AnalyzeBranch can't analyze a block and it is possible to
fallthrough, then duplicating the block doesn't make sense, as only one
block can be the layout predecessor for the un-analyzable fallthrough.

Submitted wit a test case, but NOTE: the test case doesn't currently
fail. However, the test case fails with D20505 and would have saved me
some time debugging.

llvm-svn: 278866
 2016-08-16 22:56:14 +00:00
Diana Picus 35ccf53e75 Revert "Codegen: Don't tail-duplicate blocks with un-analyzable fallthrough." 
This reverts commit r278288.

r278287 broke the clang-cmake-thumbv7-a15-full-sh bot.
Revert this so we can get to r278287.

llvm-svn: 278620
 2016-08-14 02:10:12 +00:00
Kyle Butt 81d32846b0 Codegen: Don't tail-duplicate blocks with un-analyzable fallthrough. 
If AnalyzeBranch can't analyze a block and it is possible to
fallthrough, then duplicating the block doesn't make sense, as only one
block can be the layout predecessor for the un-analyzable fallthrough.

Submitted wit a test case, but NOTE: the test case doesn't currently
fail. However, the test case fails with D20505 and would have saved me
some time debugging.

llvm-svn: 278288
 2016-08-10 21:03:27 +00:00