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.

llvm-svn: 52914

1 files changed, 7 insertions, 12 deletions

diff --git a/clang/lib/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
index 8ef94864590..32d7a6086dd 100644
--- a/clang/lib/Sema/SemaExpr.cpp
+++ b/clang/lib/Sema/SemaExpr.cpp
@@ -214,23 +214,18 @@ Action::ExprResult Sema::ActOnNumericConstant(const Token &Tok) {
   
   if (Literal.isFloatingLiteral()) {
     QualType Ty;
-    const llvm::fltSemantics *Format;
-
-    if (Literal.isFloat) {
+    if (Literal.isFloat)
       Ty = Context.FloatTy;
-      Format = Context.Target.getFloatFormat();
-    } else if (!Literal.isLong) {
+    else if (!Literal.isLong)
       Ty = Context.DoubleTy;
-      Format = Context.Target.getDoubleFormat();
-    } else {
+    else
       Ty = Context.LongDoubleTy;
-      Format = Context.Target.getLongDoubleFormat();
-    }
-    
+
+    const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty);
+
     // isExact will be set by GetFloatValue().
     bool isExact = false;
-    
-    Res = new FloatingLiteral(Literal.GetFloatValue(*Format,&isExact), &isExact, 
+    Res = new FloatingLiteral(Literal.GetFloatValue(Format, &isExact), &isExact,
                               Ty, Tok.getLocation());
     
   } else if (!Literal.isIntegerLiteral()) {