[globalisel][knownbits] Allow targets to call GISelKnownBits::computeKnownBitsImpl()

Summary:
It seems we missed that the target hook can't query the known-bits for the
inputs to a target instruction. Fix that oversight

Reviewers: aditya_nandakumar

Subscribers: rovka, hiraditya, volkan, Petar.Avramovic, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D67380

llvm-svn: 373264

2 files changed, 5 insertions, 3 deletions

diff --git a/llvm/lib/CodeGen/GlobalISel/GISelKnownBits.cpp b/llvm/lib/CodeGen/GlobalISel/GISelKnownBits.cpp
index c0391f7771f..8f9b7ddeabf 100644
--- a/llvm/lib/CodeGen/GlobalISel/GISelKnownBits.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/GISelKnownBits.cpp
@@ -119,7 +119,8 @@ void GISelKnownBits::computeKnownBitsImpl(Register R, KnownBits &Known,
 
   switch (Opcode) {
   default:
-    TL.computeKnownBitsForTargetInstr(R, Known, DemandedElts, MRI, Depth);
+    TL.computeKnownBitsForTargetInstr(*this, R, Known, DemandedElts, MRI,
+                                      Depth);
     break;
   case TargetOpcode::COPY: {
     MachineOperand Dst = MI.getOperand(0);
diff --git a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
index d7286a2789b..09c45f644e1 100644
--- a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -2589,8 +2589,9 @@ void TargetLowering::computeKnownBitsForTargetNode(const SDValue Op,
 }
 
 void TargetLowering::computeKnownBitsForTargetInstr(
-    Register R, KnownBits &Known, const APInt &DemandedElts,
-    const MachineRegisterInfo &MRI, unsigned Depth) const {
+    GISelKnownBits &Analysis, Register R, KnownBits &Known,
+    const APInt &DemandedElts, const MachineRegisterInfo &MRI,
+    unsigned Depth) const {
   Known.resetAll();
 }