Index: lib/Target/X86/X86ISelLowering.cpp
===================================================================
--- lib/Target/X86/X86ISelLowering.cpp
+++ lib/Target/X86/X86ISelLowering.cpp
@@ -317,6 +317,8 @@
   setTruncStoreAction(MVT::i32, MVT::i8 , Expand);
   setTruncStoreAction(MVT::i16, MVT::i8,  Expand);
 
+  setTruncStoreAction(MVT::f64, MVT::f32, Expand);
+
   // SETOEQ and SETUNE require checking two conditions.
   setCondCodeAction(ISD::SETOEQ, MVT::f32, Expand);
   setCondCodeAction(ISD::SETOEQ, MVT::f64, Expand);
@@ -1057,8 +1059,6 @@
       AddPromotedToType (ISD::SELECT, VT, MVT::v2i64);
     }
 
-    setTruncStoreAction(MVT::f64, MVT::f32, Expand);
-
     // Custom lower v2i64 and v2f64 selects.
     setOperationAction(ISD::LOAD,               MVT::v2f64, Legal);
     setOperationAction(ISD::LOAD,               MVT::v2i64, Legal);
Index: test/CodeGen/X86/dont-trunc-store-double-to-float.ll
===================================================================
--- /dev/null
+++ test/CodeGen/X86/dont-trunc-store-double-to-float.ll
@@ -0,0 +1,20 @@
+; RUN: llc -march=x86 < %s | FileCheck %s
+
+; CHECK-LABEL: @bar
+; CHECK: movl $1074339512,
+; CHECK: movl $1374389535,
+; CHECK: movl $1078523331,
+define void @bar() unnamed_addr {
+entry-block:
+  %a = alloca double
+  %b = alloca float
+
+  store double 3.140000e+00, double* %a
+  %0 = load double* %a
+
+  %1 = fptrunc double %0 to float
+
+  store float %1, float* %b
+
+  ret void
+}