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Document the decision to assume that the cost of floats is twice as much as integers.

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llvm-svn: 179478
This commit is contained in:
Nadav Rotem 2013-04-14 05:55:18 +00:00
parent 3b790b7f2e
commit df6d0d6209
1 changed files with 3 additions and 1 deletions
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4
lib/CodeGen/BasicTargetTransformInfo.cpp
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@ -205,11 +205,13 @@ unsigned BasicTTI::getArithmeticInstrCost(unsigned Opcode, Type *Ty,
std::pair<unsigned, MVT> LT = TLI->getTypeLegalizationCost(Ty);
bool IsFloat = Ty->getScalarType()->isFloatingPointTy();
// Assume that floating point arithmetic operations cost twice as much as
// integer operations.
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
// If the type is split to multiple registers, assume that there is some
// overhead to this.
// TODO: Once we have extract/insert subvector cost we need to use them.
if (LT.first > 1)