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TargetTransformInfo: address calculation parameter for gather/scather

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Address calculation for gather/scather in vectorized code can incur a
significant cost making vectorization unbeneficial. Add infrastructure to add
cost.
Tests and cost model for targets will be in follow-up commits.

radar://14351991

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186187 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Arnold Schwaighofer
2013-07-12 19:16:02 +00:00
parent ec11706155
commit c0a11edba6
5 changed files with 69 additions and 9 deletions
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6
include/llvm/Analysis/TargetTransformInfo.h
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@@ -339,7 +339,11 @@ public:
/// merged into the instruction indexing mode. Some targets might want to
/// distinguish between address computation for memory operations on vector
/// types and scalar types. Such targets should override this function.
virtual unsigned getAddressComputationCost(Type *Ty) const;
/// The 'IsComplex' parameter is a hint that the address computation is likely
/// to involve multiple instructions and as such unlikely to be merged into
/// the address indexing mode.
virtual unsigned getAddressComputationCost(Type *Ty,
bool IsComplex = false) const;
/// @}