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3 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
Stephen Lin
f569d23c3a Update to CodeGen tests to use CHECK-LABEL for labels corresponding to function definitions for more informative error messages. No functionality change. 
llvm-svn: 186594
 2013-07-18 18:35:22 +00:00
Tim Northover
69d676cd12 ARM: implement ldrex, strex and clrex intrinsics 
Intrinsics already existed for the 64-bit variants, so these support operations
of size at most 32-bits.

llvm-svn: 186392
 2013-07-16 09:46:55 +00:00