[ARM GlobalISel] Legalize G_SITOFP and G_UITOFP

Legal if we have hardware support, libcall otherwise.

Also add supporting code to the legalizer helper for libcalls.

llvm-svn: 323730

1 files changed, 19 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp b/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
index 4fcb6a639d8..773e51c6e34 100644
--- a/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
@@ -154,6 +154,10 @@ static RTLIB::Libcall getConvRTLibDesc(unsigned Opcode, Type *ToType,
     return RTLIB::getFPTOSINT(FromMVT, ToMVT);
   case TargetOpcode::G_FPTOUI:
     return RTLIB::getFPTOUINT(FromMVT, ToMVT);
+  case TargetOpcode::G_SITOFP:
+    return RTLIB::getSINTTOFP(FromMVT, ToMVT);
+  case TargetOpcode::G_UITOFP:
+    return RTLIB::getUINTTOFP(FromMVT, ToMVT);
   }
   llvm_unreachable("Unsupported libcall function");
 }
@@ -238,6 +242,21 @@ LegalizerHelper::libcall(MachineInstr &MI) {
       return Status;
     break;
   }
+  case TargetOpcode::G_SITOFP:
+  case TargetOpcode::G_UITOFP: {
+    // FIXME: Support other types
+    unsigned FromSize = MRI.getType(MI.getOperand(1).getReg()).getSizeInBits();
+    unsigned ToSize = MRI.getType(MI.getOperand(0).getReg()).getSizeInBits();
+    if (FromSize != 32 || (ToSize != 32 && ToSize != 64))
+      return UnableToLegalize;
+    LegalizeResult Status = conversionLibcall(
+        MI, MIRBuilder,
+        ToSize == 64 ? Type::getDoubleTy(Ctx) : Type::getFloatTy(Ctx),
+        Type::getInt32Ty(Ctx));
+    if (Status != Legalized)
+      return Status;
+    break;
+  }
   }
 
   MI.eraseFromParent();