Implement codegen for flt_rounds on x86


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44183 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.h b/lib/Target/X86/X86ISelLowering.h
index 2921f7b..ac16ff4 100644
--- a/lib/Target/X86/X86ISelLowering.h
+++ b/lib/Target/X86/X86ISelLowering.h
@@ -188,7 +188,10 @@
       //   operand #1 callee (register or absolute)
       //   operand #2 stack adjustment
       //   operand #3 optional in flag
-      TC_RETURN
+      TC_RETURN,
+
+      // Store FP control world into i16 memory
+      FNSTCW16m
     };
   }
 
@@ -477,6 +480,7 @@
     SDOperand LowerFRAME_TO_ARGS_OFFSET(SDOperand Op, SelectionDAG &DAG);
     SDOperand LowerEH_RETURN(SDOperand Op, SelectionDAG &DAG);
     SDOperand LowerTRAMPOLINE(SDOperand Op, SelectionDAG &DAG);
+    SDOperand LowerFLT_ROUNDS(SDOperand Op, SelectionDAG &DAG);
   };
 }