Make a few related changes:
1) add a new ASTContext::getFloatTypeSemantics method.
2) Use it from SemaExpr.cpp, CodeGenTypes.cpp and other places.
3) Change the TargetInfo.h get*Format methods to return their
fltSemantics byref instead of by pointer.
4) Change CodeGenFunction::EmitBuiltinExpr to allow builtins which
sometimes expand specially and othertimes fall back to libm.
5) Add support for __builtin_nan("") to codegen, cases that don't pass
in an empty string are currently lowered to libm calls.
6) Fix codegen of __builtin_infl.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52914 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/ASTContext.cpp b/lib/AST/ASTContext.cpp
index 08a2bb1..fa12364 100644
--- a/lib/AST/ASTContext.cpp
+++ b/lib/AST/ASTContext.cpp
@@ -182,6 +182,20 @@
// Type Sizing and Analysis
//===----------------------------------------------------------------------===//
+/// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified
+/// scalar floating point type.
+const llvm::fltSemantics &ASTContext::getFloatTypeSemantics(QualType T) const {
+ const BuiltinType *BT = T->getAsBuiltinType();
+ assert(BT && "Not a floating point type!");
+ switch (BT->getKind()) {
+ default: assert(0 && "Not a floating point type!");
+ case BuiltinType::Float: return Target.getFloatFormat();
+ case BuiltinType::Double: return Target.getDoubleFormat();
+ case BuiltinType::LongDouble: return Target.getLongDoubleFormat();
+ }
+}
+
+
/// getTypeSize - Return the size of the specified type, in bits. This method
/// does not work on incomplete types.
std::pair<uint64_t, unsigned>