5 Commits

Author	SHA1	Message	Date
Nuno Lopes	8650fb8e0e	make LazyValueInfo analyze the default case of switch statements (we know that in the default branch the value cannot be any of the switch cases) ... llvm-svn: 159353	2012-06-28 16:13:37 +00:00
Nuno Lopes	e6e049020b	make LVI::getEdgeValue() always intersect the constraints of the edge with the range of the block. Previously it was only performing the intersection for a few cases, thus losing precision ... llvm-svn: 159320	2012-06-28 01:16:18 +00:00
Nuno Lopes	ac59380dfd	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) ... llvm-svn: 157071	2012-05-18 21:02:10 +00:00
Nuno Lopes	b63d6cdf79	add test case for bugfix in r157032 ... llvm-svn: 157058	2012-05-18 17:44:58 +00:00
Benjamin Kramer	d9d80b1dde	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. llvm-svn: 151919	2012-03-02 15:34:43 +00:00