GlobalISel: add generic casts to IRTranslator

This adds LLVM's 3 main cast instructions (inttoptr, ptrtoint, bitcast) to the
IRTranslator. The first two are direct translations (with 2 MachineInstr types
each). Since LLT discards information, a bitcast might become trivial and we
emit a COPY in those cases instead.

llvm-svn: 276690

1 files changed, 12 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp b/llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp
index 2b91584c75d..f18467c4bb4 100644
--- a/llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp
@@ -85,6 +85,18 @@ MachineInstr *MachineIRBuilder::buildInstr(unsigned Opcode, LLT Ty,
   return NewMI;
 }
 
+MachineInstr *MachineIRBuilder::buildInstr(unsigned Opcode, ArrayRef<LLT> Tys,
+                                           unsigned Res, unsigned Op0) {
+  MachineInstr *NewMI = buildInstr(Opcode, Tys[0]);
+  for (unsigned i = 1; i < Tys.size(); ++i)
+    NewMI->setType(Tys[i], i);
+
+  MachineInstrBuilder(getMF(), NewMI)
+      .addReg(Res, RegState::Define)
+      .addReg(Op0);
+  return NewMI;
+}
+
 MachineInstr *MachineIRBuilder::buildInstr(unsigned Opcode, unsigned Res,
                                            unsigned Op0) {
   MachineInstr *NewMI = buildInstr(Opcode, LLT{});