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add: reflect48

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douniwan5788 2024-09-17 22:54:43 +08:00
commit eda204bf87
2 changed files with 8 additions and 0 deletions
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common/commonutil.c
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@ -144,6 +144,13 @@ uint32_t reflect32(uint32_t b) {
return v;
}
uint64_t reflect48(uint64_t v) {
uint64_t vhi = reflect16(v >> 32);
uint64_t vlo = reflect32(v);
v = (vlo << 32) | (vhi & 0xFFFF);
return v;
}
uint64_t reflect64(uint64_t b) {
// https://graphics.stanford.edu/~seander/bithacks.html#BitReverseTable
uint64_t v = b; // 64-bit word to reverse bit order