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Teach the SLP Vectorizer that keeping some values live over a callsite can have a cost.

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Some types, such as 128-bit vector types on AArch64, don't have any callee-saved registers. So if a value needs to stay live over a callsite, it must be spilled and refilled. This cost is now taken into account.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214859 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
James Molloy
2014-08-05 12:30:34 +00:00
parent ff8028c8da
commit 72035e9a8e
5 changed files with 146 additions and 0 deletions
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7
include/llvm/Analysis/TargetTransformInfo.h
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@@ -416,6 +416,13 @@ public:
virtual unsigned getAddressComputationCost(Type *Ty,
bool IsComplex = false) const;
/// \returns The cost, if any, of keeping values of the given types alive
/// over a callsite.
///
/// Some types may require the use of register classes that do not have
/// any callee-saved registers, so would require a spill and fill.
virtual unsigned getCostOfKeepingLiveOverCall(ArrayRef<Type*> Tys) const;
/// @}
/// Analysis group identification.