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Loop Strength Reduce: Scaling factor cost.

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Account for the cost of scaling factor in Loop Strength Reduce when rating the
formulae. This uses a target hook.

The default implementation of the hook is: if the addressing mode is legal, the
scaling factor is free.

<rdar://problem/13806271>


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183045 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Quentin Colombet
2013-05-31 21:29:03 +00:00
parent e17388fd34
commit 06f5ebc5a1
5 changed files with 96 additions and 3 deletions
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14
lib/CodeGen/BasicTargetTransformInfo.cpp
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@ -71,6 +71,9 @@ public:
virtual bool isLegalAddressingMode(Type *Ty, GlobalValue *BaseGV,
int64_t BaseOffset, bool HasBaseReg,
int64_t Scale) const;
virtual int getScalingFactorCost(Type *Ty, GlobalValue *BaseGV,
int64_t BaseOffset, bool HasBaseReg,
int64_t Scale) const;
virtual bool isTruncateFree(Type *Ty1, Type *Ty2) const;
virtual bool isTypeLegal(Type *Ty) const;
virtual unsigned getJumpBufAlignment() const;
@ -139,6 +142,17 @@ bool BasicTTI::isLegalAddressingMode(Type *Ty, GlobalValue *BaseGV,
return TLI->isLegalAddressingMode(AM, Ty);
}
int BasicTTI::getScalingFactorCost(Type *Ty, GlobalValue *BaseGV,
int64_t BaseOffset, bool HasBaseReg,
int64_t Scale) const {
TargetLoweringBase::AddrMode AM;
AM.BaseGV = BaseGV;
AM.BaseOffs = BaseOffset;
AM.HasBaseReg = HasBaseReg;
AM.Scale = Scale;
return TLI->getScalingFactorCost(AM, Ty);
}
bool BasicTTI::isTruncateFree(Type *Ty1, Type *Ty2) const {
return TLI->isTruncateFree(Ty1, Ty2);
}