public static int GetRuntimeRequiredIsaFlags(InstructionSetSupport instructionSetSupport)
{
int result = 0;
switch (instructionSetSupport.Architecture)
{
case TargetArchitecture.X86:
case TargetArchitecture.X64:
foreach (InstructionSet instructionSet in instructionSetSupport.SupportedFlags)
{
result |= XArchIntrinsicConstants.FromInstructionSet(instructionSet);
}
break;
case TargetArchitecture.ARM64:
foreach (InstructionSet instructionSet in instructionSetSupport.SupportedFlags)
{
result |= Arm64IntrinsicConstants.FromInstructionSet(instructionSet);
}
break;
default:
Debug.Fail("Unsupported Architecture");
break;
}
return(result);
}
/// <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, InstructionSet instructionSet)
{
Debug.Assert(IsIsSupportedMethod(method));
Debug.Assert(isSupportedField.IsStatic && isSupportedField.FieldType.IsWellKnownType(WellKnownType.Int32));
int flag = 0;
switch (method.Context.Target.Architecture)
{
case TargetArchitecture.X86:
case TargetArchitecture.X64:
flag = XArchIntrinsicConstants.FromInstructionSet(instructionSet);
break;
case TargetArchitecture.ARM64:
flag = Arm64IntrinsicConstants.FromInstructionSet(instructionSet);
break;
default:
Debug.Fail("Unsupported Architecture");
break;
}
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));
}
public static int GetRuntimeRequiredIsaFlags(InstructionSetSupport instructionSetSupport)
{
switch (instructionSetSupport.Architecture)
{
case TargetArchitecture.X86:
case TargetArchitecture.X64:
return(XArchIntrinsicConstants.FromInstructionSetFlags(instructionSetSupport.SupportedFlags));
case TargetArchitecture.ARM64:
return(Arm64IntrinsicConstants.FromInstructionSetFlags(instructionSetSupport.SupportedFlags));
default:
Debug.Fail("Unsupported Architecture");
return(0);
}
}
