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Sanjay Patel b34960fe47 [ValueTracking] peek through shuffles in ComputeNumSignBits (PR37549)
The motivating case is from PR37549:
https://bugs.llvm.org/show_bug.cgi?id=37549

The analysis improvement allows us to form a vector 'select' out of 
bitwise logic (the use of ComputeNumSignBits was added at rL345149).

The smaller test shows another InstCombine improvement - we use 
ComputeNumSignBits to add 'nsw' to shift-left. But the negative
test shows an example where we must not add 'nsw' - when the shuffle
mask contains undef elements.

Differential Revision: https://reviews.llvm.org/D53659

llvm-svn: 345429
2018-10-26 21:05:14 +00:00
2014-03-02 13:08:46 +00:00
2018-08-09 22:05:19 +00:00
2016-01-26 21:29:08 +00:00
2018-06-18 12:22:17 +00:00
2018-09-22 01:01:03 +00:00

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