[SOLVED] Compiling error only on DX10/11

for(int i = 0; i < tailLength % 1023; i++){

							float2 d = float2(pn.x-ONEXN*i,pn.y);
							tn = tex2Dlod(SamplerTape, float4(d,0.0,0.0) ).x;
							// tn = tex2D(_TapeTex, d).x;
							// tn = tapeNoise(float2(pn.x-ONEXN*i,pn.y), t*tapeNoiseSpeed)*tapeNoiseAmount;

							//for tails length difference
							float fadediff = tex2D(SamplerTape, d).a; //hash12(d); 

							if( tn > 0.8 ){								
								float nsx =  0.0; //new signal x
								float newlength = float(tailLength)*(1.0-fadediff); //tail lenght diff
								if( float(i) <= newlength ) nsx = 1.0-( float(i)/ newlength ); //tail
								signal.x = bms(signal.x, nsx*tapeNoiseAmount).x;									
							}
							
						}

						//tape noise color shift
						if(distShift>0.4){
							// float tnl = tapeNoiseLines(float2(0.0,pn.y), t*tapeNoiseSpeed)*tapeNoiseAmount;
							float tnl = tex2D(SamplerTape, pn).y;//tapeNoiseLines(float2(0.0,pn.y), t*tapeNoiseSpeed)*tapeNoiseAmount;
						   signal.y *= 1.0/distShift;//tnl*0.1;//*distShift;//*signal.x;
						   signal.z *= 1.0/distShift;//*distShift;//*signal.x;

						}

#define ONEXN 1

float4  PS_Test(in float4 position : SV_Position, in float2 texcoord : TEXCOORD0) : SV_Target0
{
float tailLength = texcoord.x * 1024;
float2 pn = float2(1, 1);
float tn = 0;
[loop]
for(int i = 0; i < tailLength % 1023; i++){

							float2 d = float2(pn.x-ONEXN*i,pn.y);
							tn = tex2Dlod(RFX_depthColor, float4(d,0.0,0.0) ).x;
							// tn = tex2D(_TapeTex, d).x;
							// tn = tapeNoise(float2(pn.x-ONEXN*i,pn.y), t*tapeNoiseSpeed)*tapeNoiseAmount;

							//for tails length difference
							float fadediff = tex2D(RFX_depthColor, d).a; //hash12(d); 
                            tn += fadediff;
						}
                        
    return tn;
}