Nikita Popov 00b5ecab5d [ValueTracking] Compute range for abs without nsw ...

This is a small followup to D59511. The code that was moved into
computeConstantRange() there is a bit overly conversative: If the
abs is not nsw, it does not compute any range. However, abs without
nsw still has a well-defined contiguous unsigned range from 0 to
SIGNED_MIN. This is a lot less useful than the usual 0 to SIGNED_MAX
range, but if we're already here we might as well specify it...

Differential Revision: https://reviews.llvm.org/D59563

llvm-svn: 356586

2019-03-20 18:16:02 +00:00

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