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Author SHA1 Message Date
Davide Italiano 141b2891cb [Target/ARM] Only enable OptimizeBarrierPass at -O1 and above. 
Ideally this is going to be and LLVM IR pass (shared, among others
with AArch64), but for the time being just enable it if consumers
ask us for optimization and not unconditionally.

Discussed with Tim Northover on IRC.

llvm-svn: 237837
 2015-05-20 21:40:38 +00:00
Renato Golin d93295ea56 Remove duplicated DMB instructions 
ARM specific optimiztion, finding places in ARM machine code where 2 dmbs
follow one another, and eliminating one of them.

Patch by Reinoud Elhorst.

llvm-svn: 205409
 2014-04-02 09:03:43 +00:00