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CostModel: increase the default cost of supported floating point operations from 1 to two. Fixed a few tests that changes because now the cost of one insert + a vector operation on two doubles is lower than two scalar operations on doubles.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179413 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem
2013-04-12 21:15:03 +00:00
parent 196ee11f85
commit 9eb366acba
4 changed files with 38 additions and 10 deletions
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11
lib/CodeGen/BasicTargetTransformInfo.cpp
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@ -204,20 +204,23 @@ unsigned BasicTTI::getArithmeticInstrCost(unsigned Opcode, Type *Ty,
std::pair<unsigned, MVT> LT = TLI->getTypeLegalizationCost(Ty);
bool IsFloat = Ty->getScalarType()->isFloatingPointTy();
unsigned OpCost = (IsFloat ? 2 : 1);
if (TLI->isOperationLegalOrPromote(ISD, LT.second)) {
// The operation is legal. Assume it costs 1.
// If the type is split to multiple registers, assume that thre is some
// overhead to this.
// TODO: Once we have extract/insert subvector cost we need to use them.
if (LT.first > 1)
return LT.first * 2;
return LT.first * 1;
return LT.first * 2 * OpCost;
return LT.first * 1 * OpCost;
}
if (!TLI->isOperationExpand(ISD, LT.second)) {
// If the operation is custom lowered then assume
// thare the code is twice as expensive.
return LT.first * 2;
return LT.first * 2 * OpCost;
}
// Else, assume that we need to scalarize this op.
@ -230,7 +233,7 @@ unsigned BasicTTI::getArithmeticInstrCost(unsigned Opcode, Type *Ty,
}
// We don't know anything about this scalar instruction.
return 1;
return OpCost;
}
unsigned BasicTTI::getShuffleCost(ShuffleKind Kind, Type *Tp, int Index,