Add an intrinsic and codegen support for fused multiply-accumulate. The intent

is to use this for architectures that have a native FMA instruction.

llvm-svn: 134742

1 files changed, 7 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 2afec33..3c8b04f 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -4651,6 +4651,13 @@ SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I, unsigned Intrinsic) {
   case Intrinsic::pow:
     visitPow(I);
     return 0;
+  case Intrinsic::fma:
+    setValue(&I, DAG.getNode(ISD::FMA, dl,
+                             getValue(I.getArgOperand(0)).getValueType(),
+                             getValue(I.getArgOperand(0)),
+                             getValue(I.getArgOperand(1)),
+                             getValue(I.getArgOperand(2))));
+    return 0;
   case Intrinsic::convert_to_fp16:
     setValue(&I, DAG.getNode(ISD::FP32_TO_FP16, dl,
                              MVT::i16, getValue(I.getArgOperand(0))));