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Add getUnrollingPreferences to TTI

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Allow targets to customize the default behavior of the generic loop unrolling
transformation. This will be used by the PowerPC backend when targeting the A2
core (which is in-order with a deep pipeline), and using more aggressive
defaults is important.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190542 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel
2013-09-11 19:25:43 +00:00
parent 8822f48f72
commit 4f7e2c38e8
4 changed files with 66 additions and 7 deletions
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3
lib/CodeGen/BasicTargetTransformInfo.cpp
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@ -84,6 +84,7 @@ public:
virtual unsigned getJumpBufSize() const;
virtual bool shouldBuildLookupTables() const;
virtual bool haveFastSqrt(Type *Ty) const;
virtual void getUnrollingPreferences(Loop *L, UnrollingPreferences &UP) const;
/// @}
@ -189,6 +190,8 @@ bool BasicTTI::haveFastSqrt(Type *Ty) const {
return TLI->isTypeLegal(VT) && TLI->isOperationLegalOrCustom(ISD::FSQRT, VT);
}
void BasicTTI::getUnrollingPreferences(Loop *, UnrollingPreferences &) const { }
//===----------------------------------------------------------------------===//
//
// Calls used by the vectorizers.