[Intrinsic] Unsigned Fixed Point Multiplication Intrinsic

Add an intrinsic that takes 2 unsigned integers with the scale of them
provided as the third argument and performs fixed point multiplication on
them.

This is a part of implementing fixed point arithmetic in clang where some of
the more complex operations will be implemented as intrinsics.

Differential Revision: https://reviews.llvm.org/D55625

llvm-svn: 353059

1 files changed, 3 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp b/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
index 6ff288c8976..5d080e06d75 100644
--- a/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
@@ -425,7 +425,8 @@ SDValue VectorLegalizer::LegalizeOp(SDValue Op) {
   case ISD::USUBSAT:
     Action = TLI.getOperationAction(Node->getOpcode(), Node->getValueType(0));
     break;
-  case ISD::SMULFIX: {
+  case ISD::SMULFIX:
+  case ISD::UMULFIX: {
     unsigned Scale = Node->getConstantOperandVal(2);
     Action = TLI.getFixedPointOperationAction(Node->getOpcode(),
                                               Node->getValueType(0), Scale);
@@ -784,6 +785,7 @@ SDValue VectorLegalizer::Expand(SDValue Op) {
   case ISD::SADDSAT:
     return ExpandAddSubSat(Op);
   case ISD::SMULFIX:
+  case ISD::UMULFIX:
     return ExpandFixedPointMul(Op);
   case ISD::STRICT_FADD:
   case ISD::STRICT_FSUB: