4 Commits

Author	SHA1	Message	Date
Arnold Schwaighofer	d96e427eac	LoopVectorize: Add support for floating point min/max reductions ... Add support for min/max reductions when "no-nans-float-math" is enabled. This allows us to assume we have ordered floating point math and treat ordered and unordered predicates equally. radar://13723044 llvm-svn: 181144	2013-05-05 01:54:48 +00:00
Arnold Schwaighofer	a670a0a3aa	LoopVectorize: We don't need an identity element for min/max reductions ... We can just use the initial element that feeds the reduction. max(max(x, y), z) == max(max(x,y), max(x,z)) radar://13723044 llvm-svn: 181141	2013-05-05 01:54:42 +00:00
Arnold Schwaighofer	23a0589bce	LoopVectorizer: Bail out if we don't have datalayout we need it ... llvm-svn: 180195	2013-04-24 16:15:58 +00:00
Arnold Schwaighofer	4cd6aa110c	LoopVectorizer: Recognize min/max reductions ... A min/max operation is represented by a select(cmp(lt/le/gt/ge, X, Y), X, Y) sequence in LLVM. If we see such a sequence we can treat it just as any other commutative binary instruction and reduce it. This appears to help bzip2 by about 1.5% on an imac12,2. radar://12960601 llvm-svn: 179773	2013-04-18 17:22:34 +00:00