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3 Commits

Author SHA1 Message Date
Nuno Lopes
90255a8517 allow LazyValueInfo::getEdgeValue() to reason about multiple edges from the same switch instruction by doing union of ranges (which may still be conservative, but it's more aggressive than before) 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157071 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-05-18 21:02:10 +00:00
Nuno Lopes
7397b2c751 add test case for bugfix in r157032 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157058 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-05-18 17:44:58 +00:00
Benjamin Kramer
8979e5f372 LVI: Recognize the form instcombine canonicalizes range checks into when forming constant ranges. 
This could probably be made a lot smarter, but this is a common case and doesn't require LVI to scan a lot
of code. With this change CVP can optimize away the "shift == 0" case in Hashing.h that only gets hit when
"shift" is in a range not containing 0.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151919 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-03-02 15:34:43 +00:00