Index: include/llvm/CodeGen/GlobalISel/MachineIRBuilder.h
===================================================================
--- include/llvm/CodeGen/GlobalISel/MachineIRBuilder.h
+++ include/llvm/CodeGen/GlobalISel/MachineIRBuilder.h
@@ -653,6 +653,7 @@
                                              const ConstantFP &Val);
 
   MachineInstrBuilder buildFConstant(const DstOp &Res, double Val);
+  MachineInstrBuilder buildFConstant(const DstOp &Res, const APFloat &Val);
 
   /// Build and insert \p Res = COPY Op
   ///
Index: lib/CodeGen/GlobalISel/MachineIRBuilder.cpp
===================================================================
--- lib/CodeGen/GlobalISel/MachineIRBuilder.cpp
+++ lib/CodeGen/GlobalISel/MachineIRBuilder.cpp
@@ -369,6 +369,13 @@
   return buildFConstant(Res, *CFP);
 }
 
+MachineInstrBuilder MachineIRBuilder::buildFConstant(const DstOp &Res,
+                                                     const APFloat &Val) {
+  auto &Ctx = getMF().getFunction().getContext();
+  auto *CFP = ConstantFP::get(Ctx, Val);
+  return buildFConstant(Res, *CFP);
+}
+
 MachineInstrBuilder MachineIRBuilder::buildBrCond(unsigned Tst,
                                                   MachineBasicBlock &Dest) {
   assert(getMRI()->getType(Tst).isScalar() && "invalid operand type");
Index: unittests/CodeGen/GlobalISel/MachineIRBuilderTest.cpp
===================================================================
--- unittests/CodeGen/GlobalISel/MachineIRBuilderTest.cpp
+++ unittests/CodeGen/GlobalISel/MachineIRBuilderTest.cpp
@@ -19,6 +19,10 @@
   B.buildConstant(LLT::vector(2, 32), 99);
   B.buildFConstant(LLT::vector(2, 32), 2.0);
 
+  // Test APFloat overload.
+  APFloat KVal(APFloat::IEEEdouble(), "4.0");
+  B.buildFConstant(LLT::scalar(64), KVal);
+
   auto CheckStr = R"(
   CHECK: [[CONST0:%[0-9]+]]:_(s32) = G_CONSTANT i32 42
   CHECK: [[FCONST0:%[0-9]+]]:_(s32) = G_FCONSTANT float 1.000000e+00
@@ -26,6 +30,7 @@
   CHECK: [[VEC0:%[0-9]+]]:_(<2 x s32>) = G_BUILD_VECTOR [[CONST1]]:_(s32), [[CONST1]]:_(s32)
   CHECK: [[FCONST1:%[0-9]+]]:_(s32) = G_FCONSTANT float 2.000000e+00
   CHECK: [[VEC1:%[0-9]+]]:_(<2 x s32>) = G_BUILD_VECTOR [[FCONST1]]:_(s32), [[FCONST1]]:_(s32)
+  CHECK: [[FCONST2:%[0-9]+]]:_(s64) = G_FCONSTANT double 4.000000e+00
   )";
 
   EXPECT_TRUE(CheckMachineFunction(*MF, CheckStr)) << *MF;