Index: lib/Target/ARM/ARMISelLowering.cpp
===================================================================
--- lib/Target/ARM/ARMISelLowering.cpp
+++ lib/Target/ARM/ARMISelLowering.cpp
@@ -1199,7 +1199,7 @@
   case CallingConv::C:
     if (!Subtarget->isAAPCS_ABI())
       return CallingConv::ARM_APCS;
-    else if (Subtarget->hasVFP2() &&
+    else if (Subtarget->hasVFP2() && !Subtarget->isThumb1Only() &&
              getTargetMachine().Options.FloatABIType == FloatABI::Hard &&
              !isVarArg)
       return CallingConv::ARM_AAPCS_VFP;
@@ -1207,10 +1207,10 @@
       return CallingConv::ARM_AAPCS;
   case CallingConv::Fast:
     if (!Subtarget->isAAPCS_ABI()) {
-      if (Subtarget->hasVFP2() && !isVarArg)
+      if (Subtarget->hasVFP2() && !Subtarget->isThumb1Only() && !isVarArg)
         return CallingConv::Fast;
       return CallingConv::ARM_APCS;
-    } else if (Subtarget->hasVFP2() && !isVarArg)
+    } else if (Subtarget->hasVFP2() && !Subtarget->isThumb1Only() && !isVarArg)
       return CallingConv::ARM_AAPCS_VFP;
     else
       return CallingConv::ARM_AAPCS;
Index: test/CodeGen/Thumb/fastcc.ll
===================================================================
--- /dev/null
+++ test/CodeGen/Thumb/fastcc.ll
@@ -0,0 +1,36 @@
+; RUN: llc < %s -mcpu=arm926ej-s -mattr=+vfp2
+
+; This is a regression test, to ensure that fastcc functions are correctly
+; handled when compiling for a processor which has a floating-point unit which
+; is not accessible from the selected instruction set.
+
+target datalayout = "e-m:e-p:32:32-i1:8:32-i8:8:32-i16:16:32-i64:64-v128:64:128-a:0:32-n32-S64"
+target triple = "thumbv5e-none-linux-gnueabi"
+
+; Function Attrs: optsize
+define fastcc void @_foo(float %walpha) #0 {
+entry:
+  br label %for.body13
+
+for.body13:                                       ; preds = %for.body13, %entry
+  br i1 undef, label %for.end182.critedge, label %for.body13
+
+for.end182.critedge:                              ; preds = %for.body13
+  %conv183 = fpext float %walpha to double
+  %mul184 = fmul double %conv183, 8.200000e-01
+  %conv185 = fptrunc double %mul184 to float
+  %conv188 = fpext float %conv185 to double
+  %mul189 = fmul double %conv188, 6.000000e-01
+  %conv190 = fptrunc double %mul189 to float
+  br label %for.body193
+
+for.body193:                                      ; preds = %for.body193, %for.end182.critedge
+  %mul195 = fmul float %conv190, undef
+  br label %for.body193
+}
+
+attributes #0 = { optsize "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+
+!llvm.ident = !{!0}
+
+!0 = metadata !{metadata !"clang version 3.5.0 "}