[CodeGen] Add lrint/llrint builtins

This patch add the ISD::LRINT and ISD::LLRINT along with new
intrinsics.  The changes are straightforward as for other
floating-point rounding functions, with just some adjustments
required to handle the return value being an interger.

The idea is to optimize lrint/llrint generation for AArch64
in a subsequent patch.  Current semantic is just route it to libm
symbol.

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D62017

llvm-svn: 361875

1 files changed, 5 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index a5274877ece..fe857f73b25 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -6029,12 +6029,16 @@ void SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I,
     return;
   }
   case Intrinsic::lround:
-  case Intrinsic::llround: {
+  case Intrinsic::llround:
+  case Intrinsic::lrint:
+  case Intrinsic::llrint: {
     unsigned Opcode;
     switch (Intrinsic) {
     default: llvm_unreachable("Impossible intrinsic");  // Can't reach here.
     case Intrinsic::lround:  Opcode = ISD::LROUND;  break;
     case Intrinsic::llround: Opcode = ISD::LLROUND; break;
+    case Intrinsic::lrint:   Opcode = ISD::LRINT;   break;
+    case Intrinsic::llrint:  Opcode = ISD::LLRINT;  break;
     }
 
     EVT RetVT = TLI.getValueType(DAG.getDataLayout(), I.getType());