Fix fptosi, fptoui from f16 vectors to i8, i16 vectors

Summary:
Convert f16 vectors to corresponding f32 vectors before doing the
conversion to int.

Add tests for v4f16, v8f16.

Reviewers: ab, jmolloy

Subscribers: llvm-commits, srhines

Differential Revision: http://reviews.llvm.org/D14936

llvm-svn: 255263

1 files changed, 10 insertions, 0 deletions

diff --git a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
index a23032bb3be..99b2edb38ef 100644
--- a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
+++ b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
@@ -1850,6 +1850,16 @@ static SDValue LowerVectorFP_TO_INT(SDValue Op, SelectionDAG &DAG) {
   // in the cost tables.
   EVT InVT = Op.getOperand(0).getValueType();
   EVT VT = Op.getValueType();
+  unsigned NumElts = InVT.getVectorNumElements();
+
+  // f16 vectors are promoted to f32 before a conversion.
+  if (InVT.getVectorElementType() == MVT::f16) {
+    MVT NewVT = MVT::getVectorVT(MVT::f32, NumElts);
+    SDLoc dl(Op);
+    return DAG.getNode(
+        Op.getOpcode(), dl, Op.getValueType(),
+        DAG.getNode(ISD::FP_EXTEND, dl, NewVT, Op.getOperand(0)));
+  }
 
   if (VT.getSizeInBits() < InVT.getSizeInBits()) {
     SDLoc dl(Op);