[x86] lower calls to llvm.maxnum.v4f32 using maxps

This is a follow-on to:
http://reviews.llvm.org/rL255700

llvm-svn: 256454

1 files changed, 10 insertions, 7 deletions

diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index 691fdedeae3..7719bef94e6 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -26866,20 +26866,22 @@ static SDValue PerformFMinFMaxCombine(SDNode *N, SelectionDAG &DAG) {
 
 static SDValue performFMaxNumCombine(SDNode *N, SelectionDAG &DAG,
                                      const X86Subtarget *Subtarget) {
-  // This takes at least 3 instructions, so favor a library call when
-  // minimizing code size.
-  if (DAG.getMachineFunction().getFunction()->optForMinSize())
+  if (Subtarget->useSoftFloat())
     return SDValue();
 
-  EVT VT = N->getValueType(0);
-
   // TODO: Check for global or instruction-level "nnan". In that case, we
   //       should be able to lower to FMAX/FMIN alone.
   // TODO: If an operand is already known to be a NaN or not a NaN, this
   //       should be an optional swap and FMAX/FMIN.
   // TODO: Allow f64, vectors, and fminnum.
 
-  if (VT != MVT::f32 || !Subtarget->hasSSE1() || Subtarget->useSoftFloat())
+  EVT VT = N->getValueType(0);
+  if (!(Subtarget->hasSSE1() && (VT == MVT::f32 || VT == MVT::v4f32)))
+    return SDValue();
+
+  // This takes at least 3 instructions, so favor a library call when operating
+  // on a scalar and minimizing code size.
+  if (!VT.isVector() && DAG.getMachineFunction().getFunction()->optForMinSize())
     return SDValue();
 
   SDValue Op0 = N->getOperand(0);
@@ -26911,7 +26913,8 @@ static SDValue performFMaxNumCombine(SDNode *N, SelectionDAG &DAG,
 
   // If Op0 is a NaN, select Op1. Otherwise, select the max. If both operands
   // are NaN, the NaN value of Op1 is the result.
-  return DAG.getNode(ISD::SELECT, DL, VT, IsOp0Nan, Op1, Max);
+  auto SelectOpcode = VT.isVector() ? ISD::VSELECT : ISD::SELECT;
+  return DAG.getNode(SelectOpcode, DL, VT, IsOp0Nan, Op1, Max);
 }
 
 /// Do target-specific dag combines on X86ISD::FAND nodes.