[Intrinsic] Add fixed point division intrinsics.

Summary:
This patch adds intrinsics and ISelDAG nodes for
signed and unsigned fixed-point division:

  llvm.sdiv.fix.*
  llvm.udiv.fix.*

These intrinsics perform scaled division on two
integers or vectors of integers. They are required
for the implementation of the Embedded-C fixed-point
arithmetic in Clang.

Patch by: ebevhan

Reviewers: bjope, leonardchan, efriedma, craig.topper

Reviewed By: craig.topper

Subscribers: Ka-Ka, ilya, hiraditya, jdoerfert, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D70007

1 files changed, 2 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/TargetLoweringBase.cpp b/llvm/lib/CodeGen/TargetLoweringBase.cpp
index 9198ae07c00..0fa10c11375 100644
--- a/llvm/lib/CodeGen/TargetLoweringBase.cpp
+++ b/llvm/lib/CodeGen/TargetLoweringBase.cpp
@@ -663,6 +663,8 @@ void TargetLoweringBase::initActions() {
     setOperationAction(ISD::SMULFIXSAT, VT, Expand);
     setOperationAction(ISD::UMULFIX, VT, Expand);
     setOperationAction(ISD::UMULFIXSAT, VT, Expand);
+    setOperationAction(ISD::SDIVFIX, VT, Expand);
+    setOperationAction(ISD::UDIVFIX, VT, Expand);
 
     // Overflow operations default to expand
     setOperationAction(ISD::SADDO, VT, Expand);