[llvm-commits] [PATCH] Address Space Alias Analysis

[Justin Holewinski]

The attached patch provides a new alias analysis: Address Space Alias
Analysis.  This pass is off-by-default and has no impact on generated code
unless -asaa is provided to opt.

This analysis signals NoAlias for pointers in different address spaces.  The
primary target for this pass is GPU back-ends which use LLVM address spaces
as a means for differentiating memory types (on-chip shared, off-chip
global, etc.) and hence pointers in different address spaces cannot alias.
 For OpenCL code compiled with the PTX back-end, this improves performance
by over 2x in some of my test kernels due to LLVM using this alias
information to remove redundant loads.

Is this okay to commit?

-- 

Thanks,

Justin Holewinski
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