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Hans Wennborg d5c2318adc SimplifyCFG: don't remove unreachable default switch destinations
An unreachable default destination can be exploited by other optimizations and
allows for more efficient lowering. Both the SDag switch lowering and
LowerSwitch can exploit unreachable defaults.

Also make TurnSwitchRangeICmp handle switches with unreachable default.
This is kind of separate change, but it cannot be tested without the change
above, and I don't want to land the change above without this since that would
regress other tests.

Differential Revision: http://reviews.llvm.org/D6471

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@227125 91177308-0d34-0410-b5e6-96231b3b80d8
2015-01-26 19:52:32 +00:00
autoconf Teach the autoconf machinery about the PS4 triple. 2015-01-26 15:25:05 +00:00
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docs [docs] Add link to the MIPS 64-bit ELF object file specification 2015-01-25 16:20:30 +00:00
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include Add a UTF8 to UTF16 conversion wrapper for use in the pdb dumper 2015-01-26 19:51:00 +00:00
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test SimplifyCFG: don't remove unreachable default switch destinations 2015-01-26 19:52:32 +00:00
tools Move DataLayout back to the TargetMachine from TargetSubtargetInfo 2015-01-26 19:03:15 +00:00
unittests Add a UTF8 to UTF16 conversion wrapper for use in the pdb dumper 2015-01-26 19:51:00 +00:00
utils Move DataLayout back to the TargetMachine from TargetSubtargetInfo 2015-01-26 19:03:15 +00:00
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