[Openmp-dev] long double in AST

[Rokos, Georgios via Openmp-dev]

Hi all,

I was looking at the following function from clang/lib/AST/ASTContext.cpp:1649

/// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified
/// scalar floating point type.
const llvm::fltSemantics &ASTContext::getFloatTypeSemantics(QualType T) const {
  switch (T->castAs<BuiltinType>()->getKind()) {
  default:
    llvm_unreachable("Not a floating point type!");
  case BuiltinType::Float16:
  case BuiltinType::Half:
    return Target->getHalfFormat();
  case BuiltinType::Float:      return Target->getFloatFormat();
  case BuiltinType::Double:     return Target->getDoubleFormat();
  case BuiltinType::LongDouble:
    if (getLangOpts().OpenMP && getLangOpts().OpenMPIsDevice)
      return AuxTarget->getLongDoubleFormat();
    return Target->getLongDoubleFormat();
  case BuiltinType::Float128:
    if (getLangOpts().OpenMP && getLangOpts().OpenMPIsDevice)
      return AuxTarget->getFloat128Format();
    return Target->getFloat128Format();
  }
}

For long double and float128, when we are on the device we get the "semantics" for those datatypes from AuxTarget instead of Target. Why is that?

Thanks!
George

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