2 Commits

Author	SHA1	Message	Date
Tim Northover	daeb0caa3e	ARM: tell LLVM about zext properties of ldrexb/ldrexh ... Implementing this via ComputeMaskedBits has two advantages: + It actually works. DAGISel doesn't deal with the chains properly in the previous pattern-based solution, so they never trigger. + The information can be used in other DAG combines, as well as the trivial "get rid of truncs". For example if the trunc is in a different basic block. rdar://problem/16227836 llvm-svn: 205540	2014-04-03 15:10:35 +00:00
Tim Northover	b04f8773c1	ARM: add intrinsics for the v8 ldaex/stlex ... We've already got versions without the barriers, so this just adds IR-level support for generating the new v8 ones. rdar://problem/16227836 llvm-svn: 204813	2014-03-26 14:39:31 +00:00