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configBitstreamParser: don't compute reverseByte, use a precomputed table: gain: 200ms for arty @30MHz

This commit is contained in:
Gwenhael Goavec-Merou 2021-07-14 08:44:22 +02:00
parent cc688d6db6
commit 1e0a06288d
1 changed files with 33 additions and 0 deletions
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33
src/configBitstreamParser.cpp
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@ -76,12 +76,45 @@ void ConfigBitstreamParser::displayHeader()
}
}
static constexpr uint8_t revertByteArr[256] = {
0, 128, 64, 192, 32, 160, 96, 224, 16, 144,
80, 208, 48, 176, 112, 240, 8, 136, 72, 200,
40, 168, 104, 232, 24, 152, 88, 216, 56, 184,
120, 248, 4, 132, 68, 196, 36, 164, 100, 228,
20, 148, 84, 212, 52, 180, 116, 244, 12, 140,
76, 204, 44, 172, 108, 236, 28, 156, 92, 220,
60, 188, 124, 252, 2, 130, 66, 194, 34, 162,
98, 226, 18, 146, 82, 210, 50, 178, 114, 242,
10, 138, 74, 202, 42, 170, 106, 234, 26, 154,
90, 218, 58, 186, 122, 250, 6, 134, 70, 198,
38, 166, 102, 230, 22, 150, 86, 214, 54, 182,
118, 246, 14, 142, 78, 206, 46, 174, 110, 238,
30, 158, 94, 222, 62, 190, 126, 254, 1, 129,
65, 193, 33, 161, 97, 225, 17, 145, 81, 209,
49, 177, 113, 241, 9, 137, 73, 201, 41, 169,
105, 233, 25, 153, 89, 217, 57, 185, 121, 249,
5, 133, 69, 197, 37, 165, 101, 229, 21, 149,
85, 213, 53, 181, 117, 245, 13, 141, 77, 205,
45, 173, 109, 237, 29, 157, 93, 221, 61, 189,
125, 253, 3, 131, 67, 195, 35, 163, 99, 227,
19, 147, 83, 211, 51, 179, 115, 243, 11, 139,
75, 203, 43, 171, 107, 235, 27, 155, 91, 219,
59, 187, 123, 251, 7, 135, 71, 199, 39, 167,
103, 231, 23, 151, 87, 215, 55, 183, 119, 247,
15, 143, 79, 207, 47, 175, 111, 239, 31, 159,
95, 223, 63, 191, 127, 255
};
uint8_t ConfigBitstreamParser::reverseByte(uint8_t src)
{
#if 0
uint8_t dst = 0;
for (int i=0; i < 8; i++) {
dst = (dst << 1) | (src & 0x01);
src >>= 1;
}
return dst;
#else
return revertByteArr[src];
#endif
}