[PATCH] D35110: [Analyzer] Constraint Manager Negates Difference

[Balogh, Ádám via Phabricator via cfe-commits]

baloghadamsoftware created this revision.

If range `[m .. n]` is stored for symbolic expression `A - B`, then we can deduce the range for `B - A` which is [-n .. -m]. This is only true for signed types, unless the range is `[0 .. 0]`.


https://reviews.llvm.org/D35110

Files:
  lib/StaticAnalyzer/Core/SimpleSValBuilder.cpp
  test/Analysis/std-c-library-functions.c
  test/Analysis/svalbuilder-rearrange-comparisons.c

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