Fix bug while building FP16 constant vectors for AArch64

Summary: Building FP16 constant vectors caused the FP16 data to be bitcast to i64.  This patch creates a BITCAST node with the correct value, and adds a test to verify correct handling.

Reviewers: mcrosier

Reviewed By: mcrosier

Subscribers: mcrosier, jmolloy, ab, srhines, llvm-commits, rengolin, aemerson

Differential Revision: http://reviews.llvm.org/D8369

llvm-svn: 232562

1 files changed, 4 insertions, 2 deletions

diff --git a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
index 464f56780df..93387b00e22 100644
--- a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
+++ b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
@@ -5892,8 +5892,10 @@ FailedModImm:
 
     if (VT.getVectorElementType().isFloatingPoint()) {
       SmallVector<SDValue, 8> Ops;
-      MVT NewType =
-          (VT.getVectorElementType() == MVT::f32) ? MVT::i32 : MVT::i64;
+      EVT EltTy = VT.getVectorElementType();
+      assert ((EltTy == MVT::f16 || EltTy == MVT::f32 || EltTy == MVT::f64) &&
+              "Unsupported floating-point vector type");
+      MVT NewType = MVT::getIntegerVT(EltTy.getSizeInBits());
       for (unsigned i = 0; i < NumElts; ++i)
         Ops.push_back(DAG.getNode(ISD::BITCAST, dl, NewType, Op.getOperand(i)));
       EVT VecVT = EVT::getVectorVT(*DAG.getContext(), NewType, NumElts);