/// <summary>
/// Generates IL for the IsSupported property that reads this information from a field initialized by the runtime
/// at startup. Only works for intrinsics that the code generator can generate detection code for.
/// </summary>
public static MethodIL EmitIsSupportedIL(MethodDesc method, FieldDesc isSupportedField)
{
Debug.Assert(IsIsSupportedMethod(method));
Debug.Assert(isSupportedField.IsStatic && isSupportedField.FieldType.IsWellKnownType(WellKnownType.Int32));
string id = InstructionSetSupport.GetHardwareIntrinsicId(method.Context.Target.Architecture, method.OwningType);
Debug.Assert(method.Context.Target.Architecture == TargetArchitecture.X64 ||
method.Context.Target.Architecture == TargetArchitecture.X86);
int flag = XArchIntrinsicConstants.FromHardwareIntrinsicId(id);
var emit = new ILEmitter();
ILCodeStream codeStream = emit.NewCodeStream();
codeStream.Emit(ILOpcode.ldsfld, emit.NewToken(isSupportedField));
codeStream.EmitLdc(flag);
codeStream.Emit(ILOpcode.and);
codeStream.EmitLdc(0);
codeStream.Emit(ILOpcode.cgt_un);
codeStream.Emit(ILOpcode.ret);
return(emit.Link(method));
}
/// <summary>
/// Gets a value indicating whether this is a hardware intrinsic on the platform that we're compiling for.
/// </summary>
public static bool IsHardwareIntrinsic(MethodDesc method)
{
return(!string.IsNullOrEmpty(InstructionSetSupport.GetHardwareIntrinsicId(method.Context.Target.Architecture, method.OwningType)));
}