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3 Commits

Author SHA1 Message Date
Akira Hatanaka
4eb03123df Reapply r219832 - InstCombine: Narrow switch instructions using known bits. 
The code committed in r219832 asserted when it attempted to shrink a switch
statement whose type was larger than 64-bit.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219902 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-10-16 06:00:46 +00:00
Akira Hatanaka
608d59f535 Revert r219832. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219884 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-10-16 01:17:02 +00:00
Akira Hatanaka
38537634e2 InstCombine: Narrow switch instructions using known bits. 
Truncate the operands of a switch instruction to a narrower type if the upper
bits are known to be all ones or zeros.

rdar://problem/17720004


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219832 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-10-15 19:05:50 +00:00