FXC broken

broken_min16float.hlsl

// Compiling this code with:
// fxc.exe /T ps_5_0 /O0 /E main broken_min16float.hlsl
// Will result in the following:
// error X8000: D3D11 Internal Compiler Error: Invalid Bytecode: Incompatible min precision type for operand #1 of opcode #6 (counts are 1-based). Expected int or uint.
//
// Works if compiled with Od for no optimizations

#define _h( x ) min16float( ( x ) )

cbuffer PassBuffer : register( b0 )
{
	float param0;
}

min16float BRDF_AreaLightApprox( min16float a, min16float b )
{
	return b * a;
}

float4 main() : SV_Target0
{
	min16float specular = min16float( 1 );

	min16float booster = _h( 4.0f );
	min16float specCol = _h( 0.0 );
	if( param0 > 0 )
	{
		if( param0 >= 0 )
		{
			specCol = _h( 0.5f );
		}
	}

	min16float3 tmpColour;
	tmpColour = BRDF_AreaLightApprox( specCol.x, specular );
	tmpColour *= booster;

	float4 outPs;
	outPs.xyz = tmpColour;
	outPs.w = _h( 1.0 );

	return outPs;
}