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Optimization in bitpacker

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This commit is contained in:
Paul Masurel
2017-05-27 16:38:46 +09:00
parent c04991e5ad
commit b316cd337a
1 changed files with 10 additions and 7 deletions
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17
src/common/bitpacker.rs
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@@ -119,15 +119,18 @@ impl<Data> BitUnpacker<Data>
if self.num_bits == 0 {
return 0;
}
let addr = (idx * self.num_bits) / 8;
let bit_shift = idx * self.num_bits - addr * 8;
let val_unshifted_unmasked: u64;
debug_assert!(addr + 8 <= self.data.len(),
let data: &[u8] = &*self.data;
let num_bits = self.num_bits;
let mask = self.mask;
let addr_in_bits = idx * num_bits;
let addr = addr_in_bits >> 3;
let bit_shift = addr_in_bits & 7;
debug_assert!(addr + 8 <= data.len(),
"The fast field field should have been padded with 7 bytes.");
val_unshifted_unmasked =
unsafe { *(self.data.as_ptr().offset(addr as isize) as *const u64) };
let val_unshifted_unmasked: u64 =
unsafe { *(data.as_ptr().offset(addr as isize) as *const u64) };
let val_shifted = (val_unshifted_unmasked >> bit_shift) as u64;
(val_shifted & self.mask)
(val_shifted & mask)
}
}