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Switch iteration over channels to the do{}while(); construct in order to inform the compiler that the these loops execute at least once. (This results in more intelligent output from the clang static analysis tool and should also produce faster code on at least some architectures.)

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Gregory Maxwell 2010-11-04 20:45:09 -04:00 • committed by Jean-Marc Valin
parent 60c316b419
commit 9743bf38ca
3 changed files with 56 additions and 68 deletions
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40
libcelt/bands.c
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@ -70,8 +70,7 @@ void compute_band_energies(const CELTMode *m, const celt_sig *X, celt_ener *bank
const celt_int16 *eBands = m->eBands;
const int C = CHANNELS(_C);
N = M*m->shortMdctSize;
for (c=0;c<C;c++)
{
c=0; do {
for (i=0;i<end;i++)
{
int j;
@ -98,7 +97,7 @@ void compute_band_energies(const CELTMode *m, const celt_sig *X, celt_ener *bank
}
/*printf ("%f ", bank[i+c*m->nbEBands]);*/
}
}
} while (++c<C);
/*printf ("\n");*/
}
@ -109,8 +108,7 @@ void normalise_bands(const CELTMode *m, const celt_sig * restrict freq, celt_nor
const celt_int16 *eBands = m->eBands;
const int C = CHANNELS(_C);
N = M*m->shortMdctSize;
for (c=0;c<C;c++)
{
c=0; do {
i=0; do {
celt_word16 g;
int j,shift;
@ -122,7 +120,7 @@ void normalise_bands(const CELTMode *m, const celt_sig * restrict freq, celt_nor
X[j+c*N] = MULT16_16_Q15(VSHR32(freq[j+c*N],shift-1),g);
} while (++j<M*eBands[i+1]);
} while (++i<end);
}
} while (++c<C);
}
#else /* FIXED_POINT */
@ -133,8 +131,7 @@ void compute_band_energies(const CELTMode *m, const celt_sig *X, celt_ener *bank
const celt_int16 *eBands = m->eBands;
const int C = CHANNELS(_C);
N = M*m->shortMdctSize;
for (c=0;c<C;c++)
{
c=0; do {
for (i=0;i<end;i++)
{
int j;
@ -144,7 +141,7 @@ void compute_band_energies(const CELTMode *m, const celt_sig *X, celt_ener *bank
bank[i+c*m->nbEBands] = celt_sqrt(sum);
/*printf ("%f ", bank[i+c*m->nbEBands]);*/
}
}
} while (++c<C);
/*printf ("\n");*/
}
@ -155,8 +152,7 @@ void normalise_bands(const CELTMode *m, const celt_sig * restrict freq, celt_nor
const celt_int16 *eBands = m->eBands;
const int C = CHANNELS(_C);
N = M*m->shortMdctSize;
for (c=0;c<C;c++)
{
c=0; do {
for (i=0;i<end;i++)
{
int j;
@ -164,7 +160,7 @@ void normalise_bands(const CELTMode *m, const celt_sig * restrict freq, celt_nor
for (j=M*eBands[i];j<M*eBands[i+1];j++)
X[j+c*N] = freq[j+c*N]*g;
}
}
} while (++c<C);
}
#endif /* FIXED_POINT */
@ -177,8 +173,7 @@ void denormalise_bands(const CELTMode *m, const celt_norm * restrict X, celt_sig
const int C = CHANNELS(_C);
N = M*m->shortMdctSize;
celt_assert2(C<=2, "denormalise_bands() not implemented for >2 channels");
for (c=0;c<C;c++)
{
c=0; do {
celt_sig * restrict f;
const celt_norm * restrict x;
f = freq+c*N;
@ -196,7 +191,7 @@ void denormalise_bands(const CELTMode *m, const celt_norm * restrict X, celt_sig
}
for (i=M*eBands[m->nbEBands];i<N;i++)
*f++ = 0;
}
} while (++c<C);
}
static void intensity_stereo(const CELTMode *m, celt_norm *X, celt_norm *Y, const celt_ener *bank, int bandID, int N)
@ -299,8 +294,7 @@ int folding_decision(const CELTMode *m, celt_norm *X, int *average, int *last_de
if (M*(eBands[end]-eBands[end-1]) <= 8)
return 0;
for (c=0;c<C;c++)
{
c=0; do {
for (i=0;i<end;i++)
{
int j, N, tmp=0;
@ -327,7 +321,7 @@ int folding_decision(const CELTMode *m, celt_norm *X, int *average, int *last_de
sum += tmp*256;
nbBands++;
}
}
} while (++c<C);
sum /= nbBands;
/* Recursive averaging */
sum = (sum+*average)>>1;
@ -386,12 +380,11 @@ void measure_norm_mse(const CELTMode *m, float *X, float *X0, float *bandE, floa
float g;
if (bandE0[i]<10 || (C==2 && bandE0[i+m->nbEBands]<1))
continue;
for (c=0;c<C;c++)
{
c=0; do {
g = bandE[i+c*m->nbEBands]/(1e-15+bandE0[i+c*m->nbEBands]);
for (j=M*m->eBands[i];j<M*m->eBands[i+1];j++)
MSE[i] += (g*X[j+c*N]-X0[j+c*N])*(g*X[j+c*N]-X0[j+c*N]);
}
} while (++c<C);
MSECount[i]+=C;
}
nbMSEBands = m->nbEBands;
@ -509,8 +502,7 @@ static void quant_band(int encode, const CELTMode *m, int i, celt_norm *X, celt_
{
int c;
celt_norm *x = X;
for (c=0;c<1+stereo;c++)
{
c=0; do {
int sign=0;
if (*remaining_bits>=1<<BITRES)
{
@ -527,7 +519,7 @@ static void quant_band(int encode, const CELTMode *m, int i, celt_norm *X, celt_
if (resynth)
x[0] = sign ? -NORM_SCALING : NORM_SCALING;
x = Y;
}
} while (++c<1+stereo);
if (lowband_out)
lowband_out[0] = SHR16(X[0],4);
return;