2 files changed, 22 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp b/llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp
index 475bb82e5b9..a6c285af19d 100644
--- a/llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp
@@ -284,6 +284,14 @@ MachineInstrBuilder MachineIRBuilder::buildFConstant(unsigned Res,
   return buildInstr(TargetOpcode::G_FCONSTANT).addDef(Res).addFPImm(&Val);
 }
 
+MachineInstrBuilder MachineIRBuilder::buildFConstant(unsigned Res, double Val) {
+  LLT DstTy = MRI->getType(Res);
+  auto &Ctx = MF->getFunction().getContext();
+  auto *CFP =
+      ConstantFP::get(Ctx, getAPFloatFromSize(Val, DstTy.getSizeInBits()));
+  return buildFConstant(Res, *CFP);
+}
+
 MachineInstrBuilder MachineIRBuilder::buildBrCond(unsigned Tst,
                                                   MachineBasicBlock &Dest) {
   assert(MRI->getType(Tst).isScalar() && "invalid operand type");
diff --git a/llvm/lib/CodeGen/GlobalISel/Utils.cpp b/llvm/lib/CodeGen/GlobalISel/Utils.cpp
index b34414b48b3..f39b38779bc 100644
--- a/llvm/lib/CodeGen/GlobalISel/Utils.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/Utils.cpp
@@ -11,6 +11,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/CodeGen/GlobalISel/Utils.h"
+#include "llvm/ADT/APFloat.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/CodeGen/GlobalISel/RegisterBankInfo.h"
 #include "llvm/CodeGen/MachineInstr.h"
@@ -212,3 +213,16 @@ llvm::MachineInstr *llvm::getOpcodeDef(unsigned Opcode, unsigned Reg,
   }
   return DefMI->getOpcode() == Opcode ? DefMI : nullptr;
 }
+
+APFloat llvm::getAPFloatFromSize(double Val, unsigned Size) {
+  if (Size == 32)
+    return APFloat(float(Val));
+  if (Size == 64)
+    return APFloat(Val);
+  if (Size != 16)
+    llvm_unreachable("Unsupported FPConstant size");
+  bool Ignored;
+  APFloat APF(Val);
+  APF.convert(APFloat::IEEEhalf(), APFloat::rmNearestTiesToEven, &Ignored);
+  return APF;
+}