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Code Issues Releases Activity

vp9: Ensure that the arithmetic coder values are read in the right order

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The operands of an addition can be evaluated in any order, since
the addition isn't a sequence point. The only operators that
have a defined evaluation order are &&, ||, ?: and the sequence
operator ','.

This fixes fate-vp9 on ARM RVCT.
This commit is contained in:
Martin Storsjö 2013-11-11 15:02:09 +02:00 committed by Clément Bœsch
parent 7cd555dfa5
commit ab80d7e8c5
1 changed files with 28 additions and 28 deletions
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56
libavcodec/vp9.c
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@ -1843,43 +1843,43 @@ static int decode_coeffs_b(VP56RangeCoder *c, int16_t *coef, int n_coeffs,
if (!vp56_rac_get_prob_branchy(c, tp[7])) {
val = 5 + vp56_rac_get_prob(c, 159);
} else {
val = 7 + (vp56_rac_get_prob(c, 165) << 1) +
vp56_rac_get_prob(c, 145);
val = 7 + (vp56_rac_get_prob(c, 165) << 1);
val += vp56_rac_get_prob(c, 145);
}
} else { // cat 3-6
cache[rc] = 5;
if (!vp56_rac_get_prob_branchy(c, tp[8])) {
if (!vp56_rac_get_prob_branchy(c, tp[9])) {
val = 11 + (vp56_rac_get_prob(c, 173) << 2) +
(vp56_rac_get_prob(c, 148) << 1) +
vp56_rac_get_prob(c, 140);
val = 11 + (vp56_rac_get_prob(c, 173) << 2);
val += (vp56_rac_get_prob(c, 148) << 1);
val += vp56_rac_get_prob(c, 140);
} else {
val = 19 + (vp56_rac_get_prob(c, 176) << 3) +
(vp56_rac_get_prob(c, 155) << 2) +
(vp56_rac_get_prob(c, 140) << 1) +
vp56_rac_get_prob(c, 135);
val = 19 + (vp56_rac_get_prob(c, 176) << 3);
val += (vp56_rac_get_prob(c, 155) << 2);
val += (vp56_rac_get_prob(c, 140) << 1);
val += vp56_rac_get_prob(c, 135);
}
} else if (!vp56_rac_get_prob_branchy(c, tp[10])) {
val = 35 + (vp56_rac_get_prob(c, 180) << 4) +
(vp56_rac_get_prob(c, 157) << 3) +
(vp56_rac_get_prob(c, 141) << 2) +
(vp56_rac_get_prob(c, 134) << 1) +
vp56_rac_get_prob(c, 130);
val = 35 + (vp56_rac_get_prob(c, 180) << 4);
val += (vp56_rac_get_prob(c, 157) << 3);
val += (vp56_rac_get_prob(c, 141) << 2);
val += (vp56_rac_get_prob(c, 134) << 1);
val += vp56_rac_get_prob(c, 130);
} else {
val = 67 + (vp56_rac_get_prob(c, 254) << 13) +
(vp56_rac_get_prob(c, 254) << 12) +
(vp56_rac_get_prob(c, 254) << 11) +
(vp56_rac_get_prob(c, 252) << 10) +
(vp56_rac_get_prob(c, 249) << 9) +
(vp56_rac_get_prob(c, 243) << 8) +
(vp56_rac_get_prob(c, 230) << 7) +
(vp56_rac_get_prob(c, 196) << 6) +
(vp56_rac_get_prob(c, 177) << 5) +
(vp56_rac_get_prob(c, 153) << 4) +
(vp56_rac_get_prob(c, 140) << 3) +
(vp56_rac_get_prob(c, 133) << 2) +
(vp56_rac_get_prob(c, 130) << 1) +
vp56_rac_get_prob(c, 129);
val = 67 + (vp56_rac_get_prob(c, 254) << 13);
val += (vp56_rac_get_prob(c, 254) << 12);
val += (vp56_rac_get_prob(c, 254) << 11);
val += (vp56_rac_get_prob(c, 252) << 10);
val += (vp56_rac_get_prob(c, 249) << 9);
val += (vp56_rac_get_prob(c, 243) << 8);
val += (vp56_rac_get_prob(c, 230) << 7);
val += (vp56_rac_get_prob(c, 196) << 6);
val += (vp56_rac_get_prob(c, 177) << 5);
val += (vp56_rac_get_prob(c, 153) << 4);
val += (vp56_rac_get_prob(c, 140) << 3);
val += (vp56_rac_get_prob(c, 133) << 2);
val += (vp56_rac_get_prob(c, 130) << 1);
val += vp56_rac_get_prob(c, 129);
}
}
}