Yann Collet
a8a5dfd426
fixed clang performance in lz4_fast
...
The simple change from
`matchIndex+MAX_DISTANCE < current`
towards
`current - matchIndex > MAX_DISTANCE`
is enough to generate a 10% performance drop under clang.
Quite massive.
(I missed as my eyes were concentrated on gcc performance at that time).
The second version is more robust, because it also survives a situation where
`matchIndex > current`
due to overflows.
The first version requires matchIndex to not overflow.
Hence were added `assert()` conditions.
The only case where this can happen is with dictCtx compression,
in the case where the dictionary context is not initialized before loading the dictionary.
So it's enough to always initialize the context while loading the dictionary.
2018-04-20 18:09:51 -07:00
W. Felix Handte
ee67f25576
Change vLimit Calculation
2018-04-20 20:18:30 -04:00
W. Felix Handte
1895fa19a4
Remove Redundant Static Assert
2018-04-20 20:14:12 -04:00
W. Felix Handte
fcc99d1f31
Simpler loadDict() Reset
2018-04-20 19:37:28 -04:00
W. Felix Handte
a8cb2feffd
Tolerate Base Pointer Underflow
2018-04-20 19:37:07 -04:00
W. Felix Handte
85cac61dd8
Don't Segfault on Malloc Failure
2018-04-20 19:35:51 -04:00
W. Felix Handte
756ed402da
Sign-Extend -1 to Pointer Width
2018-04-20 17:56:26 -04:00
W. Felix Handte
86b381e40b
Fix Constant Value
2018-04-20 17:13:40 -04:00
W. Felix Handte
1d2500d44e
Handle Index Underflows Safely
2018-04-20 17:13:03 -04:00
W. Felix Handte
7874cf06b3
Consts and Asserts and Other Minor Nits
2018-04-20 15:30:08 -04:00
W. Felix Handte
209c9c29d1
Add Some Simple Fuzzer Tests
2018-04-20 15:16:41 -04:00
W. Felix Handte
3f087cf1cb
Add Comments on New Public APIs
2018-04-20 15:00:53 -04:00
W. Felix Handte
d7347f9eea
Add API for Attaching Dictionaries
2018-04-20 14:59:34 -04:00
W. Felix Handte
ca833f928f
Also Reset the Chain Table
2018-04-20 14:16:27 -04:00
W. Felix Handte
8f118cf6e9
Remove inputBuffer from Context, Work Around its Absence
2018-04-20 14:08:06 -04:00
W. Felix Handte
0064e8ebc7
Remove Commented Out Support for Match Continuation over Segment Boundary
2018-04-20 13:14:37 -04:00
W. Felix Handte
14c577d4c9
Fix Signedness of Comparison
2018-04-19 20:54:35 -04:00
W. Felix Handte
f4b13e17ea
Don't Clear the Dictionary Context Until No Longer Useful
2018-04-19 20:54:35 -04:00
W. Felix Handte
0abc23f72e
Copy DictCtx into Working Context on Inputs Larger than 4 KB
2018-04-19 20:54:35 -04:00
W. Felix Handte
b67de2a327
Force Inline on HashChain
2018-04-19 20:54:35 -04:00
W. Felix Handte
22e16d5b50
Split DictCtx-using Code Into Separate Inlining Chain
2018-04-19 20:54:35 -04:00
W. Felix Handte
0a2abacd90
Use Fast Reset in LZ4F Again
2018-04-19 20:54:35 -04:00
W. Felix Handte
61c7ceffed
Use Fast Reset API in LZ4F
2018-04-19 20:54:35 -04:00
W. Felix Handte
3591fe8ab8
Add Fast Reset Paths
2018-04-19 20:54:35 -04:00
W. Felix Handte
8db291bc1d
Remove Match Upper Bounds Check
2018-04-19 20:54:35 -04:00
W. Felix Handte
8f9a2db0e1
Fix Some Cast/Conversion Warnings
2018-04-19 20:54:35 -04:00
W. Felix Handte
221211d7d0
Fix Offset Math
2018-04-19 20:54:35 -04:00
W. Felix Handte
a1beba13f7
Reset Stream in LZ4_compress_HC
2018-04-19 20:54:35 -04:00
W. Felix Handte
bdd7af6f71
Don't Bother Clearing Chain Table for Working Contexts
2018-04-19 20:54:35 -04:00
W. Felix Handte
895e76cc20
Push Previous Compression Offsets into the Past
2018-04-19 20:54:35 -04:00
W. Felix Handte
22db704a73
Shift Dict Limit Checks out of the Loop
2018-04-19 20:54:35 -04:00
W. Felix Handte
4f7b7a8ffa
Clear Tables on Dict Load
2018-04-19 20:54:35 -04:00
W. Felix Handte
b88a0b4e88
Only Perform Dict Lookup if Attempts Remain
2018-04-19 20:54:35 -04:00
W. Felix Handte
b6c35ed642
Avoid Resetting Chain Table
2018-04-19 20:54:35 -04:00
W. Felix Handte
595ea58289
Avoid Resetting Hash Table
2018-04-19 20:54:35 -04:00
W. Felix Handte
66d217e240
Perform Lookups into the Dictionary Context
2018-04-19 20:54:35 -04:00
W. Felix Handte
6289ff4fb1
Call LZ4F_applyCDict Even on NULL CDict
2018-04-19 20:54:35 -04:00
W. Felix Handte
fdeead0b09
Set dictCtx Rather than memcpy'ing Ctx
2018-04-19 20:54:35 -04:00
W. Felix Handte
a992d11fc2
Fully Bounds Check Hash Table Reads
2018-04-19 20:54:35 -04:00
W. Felix Handte
f895b9a6c6
Add a Dictionary Context Pointer to the HC Context
2018-04-19 20:54:35 -04:00
W. Felix Handte
e75153f508
Add Debug Log Statements to HC
2018-04-19 20:54:35 -04:00
W. Felix Handte
e0d8add791
Fix Framebench Output Buffer Sizing
2018-04-19 20:45:48 -04:00
W. Felix Handte
9dae661b1f
Fix Cast
2018-04-19 20:45:48 -04:00
W. Felix Handte
f646c512e9
Print Failure Message in Framebench
2018-04-19 20:45:48 -04:00
W. Felix Handte
9d971fd5c3
Switch to Unaligned Samples to Compress Different Blobs Each Time
2018-04-19 20:45:47 -04:00
W. Felix Handte
66f0c29aa4
Fix Framebench Statistics
2018-04-19 20:45:47 -04:00
W. Felix Handte
09df7a05f9
Add Run Name to Frame Bench Output
2018-04-19 20:45:47 -04:00
W. Felix Handte
a9a62321ff
Auto-Calculate Appropriate Repetition Count
2018-04-19 20:45:47 -04:00
W. Felix Handte
d4ee7554fc
Print More Detailed Results Inside bench(), Add Compression Levels
2018-04-19 20:45:47 -04:00
W. Felix Handte
ffb2d8b0ed
Check Compressed Buffer is Correct in Frame Bench
2018-04-19 20:45:47 -04:00
