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Author SHA1 Message Date
Chandler Carruth 301ed0c3b4 Revert r229944: EH: Prune unreachable resume instructions during Dwarf EH preparation 
This doesn't pass 'ninja check-llvm' for me. Lots of tests, including
the ones updated, fail with crashes and other explosions.

llvm-svn: 229952
 2015-02-20 02:15:36 +00:00
Reid Kleckner 0b647e6cca EH: Prune unreachable resume instructions during Dwarf EH preparation 
Today a simple function that only catches exceptions and doesn't run
destructor cleanups ends up containing a dead call to _Unwind_Resume
(PR20300). We can't remove these dead resume instructions during normal
optimization because inlining might introduce additional landingpads
that do have cleanups to run. Instead we can do this during EH
preparation, which is guaranteed to run after inlining.

Fixes PR20300.

Reviewers: majnemer

Differential Revision: http://reviews.llvm.org/D7744

llvm-svn: 229944
 2015-02-20 01:00:19 +00:00
Reid Kleckner 7bb0738d82 Add an IR-to-IR test for dwarf EH preparation using opt 
This tests the simple resume instruction elimination logic that we have
before making some changes to it.

llvm-svn: 229768
 2015-02-18 23:17:41 +00:00