Vec_reluf gives unexpected result

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Vec_reluf gives unexpected result

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Contributor I

Hi, I am trying to make the function vec_reluf working from naturedsp_hifi4.

I've made a simple test

 

        float32_t testIn[5] = {-1.0f, 2.3f, 3.0f, -4.4f, 2000.0f};
        float32_t testOut[5] ={0};
        vec_reluf(testOut, testIn, 1000.0f, 5);

 

the expected behavior is to obtain:

testOut={0, 2.3, 3, 0, 1000} 

but the result is:

testOut = {0, 1.40129846e-45, 1.40129846e-45, 0 , 1.40129846e-45}

here is the function:

 

void vec_reluf     (float32_t * y, const float32_t * x, float32_t K, int N)
{
    ae_valign aY;
    const xtfloatx2* restrict pX=(const xtfloatx2*)x;
          xtfloatx2* restrict pY=(      xtfloatx2*)y;
    xtfloatx2 zero=XT_CONST_S(0);
    int n;
    if (N<=0) return;
    if (((uintptr_t)pX)&7)
    {
        xtfloat t;
        XT_LSIP(t,castxcc(xtfloat,pX),sizeof(xtfloat));
        t=XT_MIN_S(K,t);
        t=XT_MAX_S(t,zero);
        XT_SSIP(t,castxcc(xtfloat,pY),sizeof(xtfloat));
        N--;
    }
    aY=AE_ZALIGN64();
    for(n=0; n<(N>>1); n++)
    {
        xtfloatx2 t;
        XT_LSX2IP(t,pX,sizeof(xtfloatx2));
        t=XT_MIN_SX2(K,t);
        t=XT_MAX_SX2(t,zero);
        XT_SASX2IP(t,aY,pY);
    }
    AE_SA64POS_FP(aY,pY);
    if(N&1)
    {
        xtfloat t;
        t=XT_LSI((const xtfloat*)pX,0);
        t=XT_MIN_S(K,t);
        t=XT_MAX_S(t,zero);
        XT_SSI(t,(xtfloat*)pY,0);
    }
}

 

Any suggestion?

Thx, Thomas

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2 Replies

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NXP TechSupport
NXP TechSupport

Hello Thomas,

Hope you are doing well.

Could you please tell me which version of the SDK you are working with. Also I am unable to find the code you have posted. I do see the NatureDSP_Signal_math.h which includes this definition but not the full function. I'd like to verify that I am also seeing the same on my end and can reproduce this behavior.

Best Regards,

Sabina

 

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Contributor I

Hi Sabina,

Thank you to take the time to answer me, the problem has disappeared one morning after a restart of the computer. I am not sure the restart has solved this but I cannot reproduce the problem.

Just in case, hereafter the information asked:

  • SDK_2.8.0_EVK-MIMXRT685
  • the function is in naturedsp_hifi4/mathhf/vec_relu_hifi4.c

Best regards,

Thomas 

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