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Help compiler vectorization for gain estimation

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This commit is contained in:
Antoine SOULIER
2022-05-10 13:47:39 +02:00
parent 5a8617eba7
commit 913ed465f6
1 changed files with 11 additions and 15 deletions
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26
src/spec.c
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@@ -77,28 +77,24 @@ LC3_HOT static int estimate_gain(
int nbits = nbits_budget + nbits_off + 0.5f;
int g_int = 255 - g_off;
for (int i = 128; i > 0; i >>= 1) {
const float *e_ptr = e + ne-1;
for (int i = 128, j, j0 = ne-1, j1 ; i > 0; i >>= 1) {
float gn = g_int - i;
float v = 0;
g_int -= i;
for (j = j0; j >= 0 && e[j] < gn; j--);
for ( ; e_ptr >= e && *e_ptr < g_int; e_ptr--);
for (j1 = j; j >= 0; j--) {
float e_diff = e[j] - gn;
while (e_ptr >= e) {
float e_diff = *(e_ptr--) - g_int;
if (e_diff < 0) {
v += 2.7f * 28.f/20;
} else {
v += e_diff + 7 * 28.f/20;
if (e_diff > 43 * 28.f/20)
v += e_diff - 43 * 28.f/20;
}
v += e_diff < 0 ? 2.7f * 28.f/20 :
e_diff < 43 * 28.f/20 ? e_diff + 7 * 28.f/20 :
2*e_diff - 36 * 28.f/20 ;
}
if (v > nbits * 1.4f * 28.f/20)
g_int += i;
j0 = j1;
else
g_int = g_int - i;
}
/* --- Limit gain index --- */