For i386, don't use the generic code.

As the comment around 7746 says, it's better to use the x87 extended precision
here than SSE. And the generic code doesn't know how to do that. It also regains
the speed lost for the uint64_to_float.c testcase.
<rdar://problem/10669858>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147869 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index d48cfbf49a565f61bbece68f010be796b732abdf..f153ef35cac4748deea9c7783ee0604f593f2740 100644 (file)
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -7714,7 +7714,8 @@ SDValue X86TargetLowering::LowerUINT_TO_FP(SDValue Op,
     return LowerUINT_TO_FP_i64(Op, DAG);
   else if (SrcVT == MVT::i32 && X86ScalarSSEf64)
     return LowerUINT_TO_FP_i32(Op, DAG);
-  else if (SrcVT == MVT::i64 && DstVT == MVT::f32)
+  else if (Subtarget->is64Bit() &&
+           SrcVT == MVT::i64 && DstVT == MVT::f32)
     return SDValue();
 
   // Make a 64-bit buffer, and use it to build an FILD.
@@ -7735,7 +7736,7 @@ SDValue X86TargetLowering::LowerUINT_TO_FP(SDValue Op,
 
   assert(SrcVT == MVT::i64 && "Unexpected type in UINT_TO_FP");
   SDValue Store = DAG.getStore(DAG.getEntryNode(), dl, Op.getOperand(0),
-                                StackSlot, MachinePointerInfo(),
+                               StackSlot, MachinePointerInfo(),
                                false, false, 0);
   // For i64 source, we need to add the appropriate power of 2 if the input
   // was negative.  This is the same as the optimization in