The attached patches implement most of the ARM AAPCS-VFP hard float

ABI. The missing piece is support for putting "homogeneous aggregates"
into registers.

Patch by Sandeep Patel!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73095 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Target/TargetMachine.h

@@ -78,6 +78,14 @@ namespace CodeGenOpt {
   };
 }
 
+namespace FloatABI {
+  enum ABIType {
+    Default,
+    Soft,
+    Hard
+  };
+}
+
 //===----------------------------------------------------------------------===//
 ///
 /// TargetMachine - Primary interface to the complete machine description for
@@ -88,7 +96,7 @@ class TargetMachine {
   TargetMachine(const TargetMachine &);   // DO NOT IMPLEMENT
   void operator=(const TargetMachine &);  // DO NOT IMPLEMENT
 protected: // Can only create subclasses.
-  TargetMachine() : AsmInfo(0) { }
+  TargetMachine();
 
   /// getSubtargetImpl - virtual method implemented by subclasses that returns
   /// a reference to that target's TargetSubtarget-derived member variable.

include/llvm/Target/TargetOptions.h

@@ -73,6 +73,14 @@ namespace llvm {
   /// target FP instructions.
   extern bool UseSoftFloat;
 
+  /// FloatABIType - This setting is set by -float-abi=xxx option is specfied
+  /// on the command line. This setting may either be Default, Soft, or Hard.
+  /// Default selects the target's default behavior. Soft selects the ABI for
+  /// UseSoftFloat, but does not inidcate that FP hardware may not be used.
+  /// Such a combination is unfortunately popular (e.g. arm-apple-darwin).
+  /// Hard presumes that the normal FP ABI is used.
+  extern FloatABI::ABIType FloatABIType;
+
   /// NoZerosInBSS - By default some codegens place zero-initialized data to
   /// .bss section. This flag disables such behaviour (necessary, e.g. for
   /// crt*.o compiling).