diff options
author | Jean-Marc Valin <jmvalin@jmvalin.ca> | 2014-01-21 19:39:33 +0400 |
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committer | Jean-Marc Valin <jmvalin@jmvalin.ca> | 2014-01-21 19:39:33 +0400 |
commit | 29354ff6e05c9ead9454981a7404a9b9ea203d2e (patch) | |
tree | 16aa779b5131949ce01b9d1837d2533f1654fc43 /celt | |
parent | ce1173c77fa2ed5e731db2bbd4c7527d57a8c335 (diff) |
Save more integer divisions on ARM when we know the operands are positive
Diffstat (limited to 'celt')
-rw-r--r-- | celt/bands.c | 15 | ||||
-rw-r--r-- | celt/entcode.h | 1 | ||||
-rw-r--r-- | celt/pitch.c | 4 | ||||
-rw-r--r-- | celt/rate.c | 7 | ||||
-rw-r--r-- | celt/vq.c | 4 |
5 files changed, 18 insertions, 13 deletions
diff --git a/celt/bands.c b/celt/bands.c index 7e1d97eb..75f40787 100644 --- a/celt/bands.c +++ b/celt/bands.c @@ -281,7 +281,8 @@ void anti_collapse(const CELTMode *m, celt_norm *X_, unsigned char *collapse_mas N0 = m->eBands[i+1]-m->eBands[i]; /* depth in 1/8 bits */ - depth = (1+pulses[i])/((m->eBands[i+1]-m->eBands[i])<<LM); + celt_assert(pulses[i]>=0); + depth = celt_udiv(1+pulses[i], (m->eBands[i+1]-m->eBands[i])<<LM); #ifdef FIXED_POINT thresh32 = SHR32(celt_exp2(-SHL16(depth, 10-BITRES)),1); @@ -491,7 +492,7 @@ int spreading_decision(const CELTMode *m, const celt_norm *X, int *average, /* Only include four last bands (8 kHz and up) */ if (i>m->nbEBands-4) - hf_sum += 32*(tcount[1]+tcount[0])/N; + hf_sum += celt_udiv(32*(tcount[1]+tcount[0]), N); tmp = (2*tcount[2] >= N) + (2*tcount[1] >= N) + (2*tcount[0] >= N); sum += tmp*256; nbBands++; @@ -501,7 +502,7 @@ int spreading_decision(const CELTMode *m, const celt_norm *X, int *average, if (update_hf) { if (hf_sum) - hf_sum /= C*(4-m->nbEBands+end); + hf_sum = celt_udiv(hf_sum, C*(4-m->nbEBands+end)); *hf_average = (*hf_average+hf_sum)>>1; hf_sum = *hf_average; if (*tapset_decision==2) @@ -517,7 +518,8 @@ int spreading_decision(const CELTMode *m, const celt_norm *X, int *average, } /*printf("%d %d %d\n", hf_sum, *hf_average, *tapset_decision);*/ celt_assert(nbBands>0); /* end has to be non-zero */ - sum /= nbBands; + celt_assert(sum>=0); + sum = celt_udiv(sum, nbBands); /* Recursive averaging */ sum = (sum+*average)>>1; *average = sum; @@ -775,7 +777,8 @@ static void compute_theta(struct band_ctx *ctx, struct split_ctx *sctx, ec_dec_update(ec, fl, fl+fs, ft); } } - itheta = (opus_int32)itheta*16384/qn; + celt_assert(itheta>=0); + itheta = celt_udiv((opus_int32)itheta*16384, qn); if (encode && stereo) { if (itheta==0) @@ -1089,7 +1092,7 @@ static unsigned quant_band(struct band_ctx *ctx, celt_norm *X, longBlocks = B0==1; - N_B /= B; + N_B = celt_udiv(N_B, B); /* Special case for one sample */ if (N==1) diff --git a/celt/entcode.h b/celt/entcode.h index c10fe8d7..66f281de 100644 --- a/celt/entcode.h +++ b/celt/entcode.h @@ -122,6 +122,7 @@ opus_uint32 ec_tell_frac(ec_ctx *_this); /* Tested exhaustively for all n and for 1<=d<=256 */ static OPUS_INLINE opus_uint32 celt_udiv(opus_uint32 n, opus_uint32 d) { + celt_assert(d>0); #ifdef USE_SMALL_DIV_TABLE if (d>256) return n/d; diff --git a/celt/pitch.c b/celt/pitch.c index d4037892..2f0b14b7 100644 --- a/celt/pitch.c +++ b/celt/pitch.c @@ -460,7 +460,7 @@ opus_val16 remove_doubling(opus_val16 *x, int maxperiod, int minperiod, opus_val16 g1; opus_val16 cont=0; opus_val16 thresh; - T1 = (2*T0+k)/(2*k); + T1 = celt_udiv(2*T0+k, 2*k); if (T1 < minperiod) break; /* Look for another strong correlation at T1b */ @@ -472,7 +472,7 @@ opus_val16 remove_doubling(opus_val16 *x, int maxperiod, int minperiod, T1b = T0+T1; } else { - T1b = (2*second_check[k]*T0+k)/(2*k); + T1b = celt_udiv(2*second_check[k]*T0+k, 2*k); } dual_inner_prod(x, &x[-T1], &x[-T1b], N, &xy, &xy2); xy += xy2; diff --git a/celt/rate.c b/celt/rate.c index e13d839d..f2e49a53 100644 --- a/celt/rate.c +++ b/celt/rate.c @@ -333,7 +333,7 @@ static OPUS_INLINE int interp_bits2pulses(const CELTMode *m, int start, int end, /*Figure out how many left-over bits we would be adding to this band. This can include bits we've stolen back from higher, skipped bands.*/ left = total-psum; - percoeff = left/(m->eBands[codedBands]-m->eBands[start]); + percoeff = celt_udiv(left, m->eBands[codedBands]-m->eBands[start]); left -= (m->eBands[codedBands]-m->eBands[start])*percoeff; rem = IMAX(left-(m->eBands[j]-m->eBands[start]),0); band_width = m->eBands[codedBands]-m->eBands[j]; @@ -414,7 +414,7 @@ static OPUS_INLINE int interp_bits2pulses(const CELTMode *m, int start, int end, /* Allocate the remaining bits */ left = total-psum; - percoeff = left/(m->eBands[codedBands]-m->eBands[start]); + percoeff = celt_udiv(left, m->eBands[codedBands]-m->eBands[start]); left -= (m->eBands[codedBands]-m->eBands[start])*percoeff; for (j=start;j<codedBands;j++) bits[j] += ((int)percoeff*(m->eBands[j+1]-m->eBands[j])); @@ -465,7 +465,8 @@ static OPUS_INLINE int interp_bits2pulses(const CELTMode *m, int start, int end, offset += NClogN>>3; /* Divide with rounding */ - ebits[j] = IMAX(0, (bits[j] + offset + (den<<(BITRES-1))) / (den<<BITRES)); + ebits[j] = IMAX(0, (bits[j] + offset + (den<<(BITRES-1)))); + ebits[j] = celt_udiv(ebits[j], den<<BITRES); /* Make sure not to bust */ if (C*ebits[j] > (bits[j]>>BITRES)) @@ -94,7 +94,7 @@ static void exp_rotation(celt_norm *X, int len, int dir, int stride, int K, int } /*NOTE: As a minor optimization, we could be passing around log2(B), not B, for both this and for extract_collapse_mask().*/ - len /= stride; + len = celt_udiv(len, stride); for (i=0;i<stride;i++) { if (dir < 0) @@ -143,7 +143,7 @@ static unsigned extract_collapse_mask(int *iy, int N, int B) return 1; /*NOTE: As a minor optimization, we could be passing around log2(B), not B, for both this and for exp_rotation().*/ - N0 = N/B; + N0 = celt_udiv(N, B); collapse_mask = 0; i=0; do { int j; |