diff options
Diffstat (limited to 'src/display/display_sink/imp_x86.rs')
| -rw-r--r-- | src/display/display_sink/imp_x86.rs | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/display/display_sink/imp_x86.rs b/src/display/display_sink/imp_x86.rs index 9290c3c..902ea69 100644 --- a/src/display/display_sink/imp_x86.rs +++ b/src/display/display_sink/imp_x86.rs @@ -1,3 +1,15 @@ +//! `imp_x86` has specialized copies to append short strings to strings. buffer sizing must be +//! handled by callers, in all cases. +//! +//! the structure of all implementations here is, essentially, to take the size of the data to +//! append and execute a copy for each bit set in that size, from highest to lowest. some bits are +//! simply never checked if the input is promised to never be that large - if a string to append is +//! only 0..7 bytes long, it is sufficient to only look at the low three bits to copy all bytes. +//! +//! in this way, it is slightly more efficient to right-size which append function is used, if the +//! maximum size of input strings can be bounded well. if the maximum size of input strings cannot +//! be bounded, you shouldn't be using these functions. + /// append `data` to `buf`, assuming `data` is less than 8 bytes and that `buf` has enough space /// remaining to hold all bytes in `data`. /// |