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/X86TargetMachine.cpp

@@ -188,6 +188,9 @@ bool X86TargetMachine::addInstSelector(PassManagerBase &PM, bool Fast) {
   if (EnableFastISel)
     PM.add(createDeadMachineInstructionElimPass());
 
+  // Install a pass to insert x87 FP_REG_KILL instructions, as needed.
+  PM.add(createX87FPRegKillInserterPass());
+
   return false;
 }