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| author | Nadav Rotem <nrotem@apple.com> | 2013-04-14 05:55:18 +0000 |
|---|---|---|
| committer | Nadav Rotem <nrotem@apple.com> | 2013-04-14 05:55:18 +0000 |
| commit | 420820056d42c93ea64cd86a95848bf4e0040670 (patch) | |
| tree | a73f96c47152923851234139e8840ea8a8c1808e /lib/CodeGen/BasicTargetTransformInfo.cpp | |
| parent | d9f88da7b329c54ccb0d2ebd3b3a4b0e4b1e2b06 (diff) | |
| download | external_llvm-420820056d42c93ea64cd86a95848bf4e0040670.zip external_llvm-420820056d42c93ea64cd86a95848bf4e0040670.tar.gz external_llvm-420820056d42c93ea64cd86a95848bf4e0040670.tar.bz2 | |
Document the decision to assume that the cost of floats is twice as much as integers.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179478 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/BasicTargetTransformInfo.cpp')
| -rw-r--r-- | lib/CodeGen/BasicTargetTransformInfo.cpp | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/CodeGen/BasicTargetTransformInfo.cpp b/lib/CodeGen/BasicTargetTransformInfo.cpp index 499571f..4a99184 100644 --- a/lib/CodeGen/BasicTargetTransformInfo.cpp +++ b/lib/CodeGen/BasicTargetTransformInfo.cpp @@ -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) |