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vulkan_ffv1: optimize symbol reader

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This was the fastest variant tested.
This commit is contained in:
Lynne 2025-04-02 20:46:12 +00:00
parent defebd74c0
commit fc960dafef
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GPG key ID: A2FEA5F03F034464
1 changed files with 5 additions and 7 deletions
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12
libavcodec/vulkan/ffv1_dec.comp
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@ -78,13 +78,11 @@ int get_isymbol(inout RangeCoder c, uint64_t state)
state += 21;
int a = 1 << e;
int i;
for (i = e - 1; i >= 9; i--)
a |= int(get_rac(c, state + 9)) << i; // 22..31
for (; i >= 0; i--)
a |= int(get_rac(c, state + i)) << i; // 22..31
int a = 1;
for (int i = e - 1; i >= 0; i--) {
a <<= 1;
a |= int(get_rac(c, state + min(i, 9))); // 22..31
}
return get_rac(c, state - 11 + min(e, 10)) ? -a : a;
}