Move the code that inserts X87 FP_REG_KILL instructions from a

special-purpose hook to a new pass. Also, add check to see if any
x87 virtual registers are used, to avoid doing any work in the
common case that no x87 code is needed.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59190 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/X86/X86.h

@@ -35,6 +35,11 @@ FunctionPass *createX86ISelDag(X86TargetMachine &TM, bool Fast);
 ///
 FunctionPass *createX86FloatingPointStackifierPass();
 
+/// createX87FPRegKillInserterPass - This function returns a pass which
+/// inserts FP_REG_KILL instructions where needed.
+///
+FunctionPass *createX87FPRegKillInserterPass();
+
 /// createX86CodePrinterPass - Returns a pass that prints the X86
 /// assembly code for a MachineFunction to the given output stream,
 /// using the given target machine description.